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  • 101.
    Lyphout, Christophe
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Adhesion and residual stress characterization of HVOF sprayed inconel 718 coatings2008Doktoravhandling, med artikler (Annet vitenskapelig)
  • 102.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Fasth, Angelica
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Mechanical Property of HVOF Inconel 718 Coating for Aeronautic Repair2014Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 23, nr 3, s. 380-388Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The module of elasticity is one of the most important mechanical properties defining the strength of a material which is a prerequisite to design a component from its early stage of conception to its field of application. When a material is to be thermally sprayed, mechanical properties of the deposited layers differ from the bulk material, mainly due to the anisotropy of the highly textured coating microstructure. The mechanical response of the deposited layers significantly influences the overall performance of the coated component. It is, therefore, of importance to evaluate the effective module of elasticity of the coating. Conventional experimental methods such as microindentation, nanoindentation and four-point bending tests have been investigated and their results vary significantly, mainly due to inhomogeneous characteristics of the coating microstructure. Synchrotron radiation coupled with a tensile test rig has been proposed as an alternative method to determine the coating anisotropic elastic behavior dependence on crystallographic orientations. The investigation was performed on Inconel 718 (IN718) HVOF coatings sprayed on IN718 substrates. Combining these experimental techniques yield a deeper understanding of the nature of the HVOF coating Young’s modulus and thus a tool for Design Practice for repair applications. © 2013 ASM International.

  • 103.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Östergren, Lars
    Volvo Aero Corporation.
    Sieger, Max
    Klassen, Thomas
    Binder, Kurt
    Comparative Study on the Properties of INCONEL 718 Coatings Deposited by High Velocity Thermal Spray Methods2011Inngår i: Surface Modification Technologies XXV : Proceedings of the Twenty Fith  International Conference on Surface Modification Technologies-SMT25: Trollhättan, June 20-22, 2011, 2011, s. 51-58Konferansepaper (Fagfellevurdert)
  • 104.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Klement, Uta
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Sattari, M.
    Characterization of adhesion strenght of HVOF sprayed IN718 coatings2009Inngår i: Proceedings of th 22nd Internationa Conference on Surface Modification technolgies - SMT22. Trollhättan, Sweden / [ed] T.S. Sudarshan & Per Nylen, VALAR Docs , 2009, s. 11-18Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The tensile adhesion strength of thermally sprayed coating is conventionally evaluated via the ASTM C633-69 standard. The maximum measurable adhesion is then limited by the adhesion strength of the polymer media. High velocity oxy-fuel (HVOF) spraying can exhibit very high bonding strength and thus it is essential to develop an alternative method to evaluate coating adhesion strength. In this work a Modified Tensile Adhesion Test (MTAT) is proposed replacing gluing with induction brazing. The method was evaluated for HVOF sprayed Inconel 718 coatings deposited on Inconel 718 substrates. The effect of induction brazing process and the characteristics of the braze-coating interface was given particular interest. The results indicate that the method is superior to the ASTM C633-69 for characterisation of adhesion of coatings with high bond strength.

  • 105.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Manescu, A.
    Università Politecnica delle Marche, Ancona, Italy.
    Pirling, T.
    Laue-Langevin Institute (ILL), Grenoble, France.
    Erratum  Residual stresses distribution through thick HVOF sprayed inconel 718 coatings: (Journal of Thermal Spray Technology DOI: 10.1007/s11666-008-9242- 9)2011Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 20, nr 5, s. 1140-Artikkel i tidsskrift (Fagfellevurdert)
  • 106.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Manescu, A
    Università Politecnica delle Marche, Ancona, Italy.
    Pirling, T.
    Laue-Langevin Institute (ILL), Grenoble, France.
    Residual stresses distribution through thick HVOF sprayed inconel 718 coatings2008Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 17, nr 5-6, s. 915-923Artikkel i tidsskrift (Fagfellevurdert)
  • 107.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Pirling, T.
    Insitute Laue- Langevin, Grenoble.
    Manescu, A.
    Universitá Politecnica delle Marche, Ancona.
    Influence of substrate preparation on HVOF IN718 coating adhesion strength2011Inngår i: Surface Modification Technologies XXV : Proceedings of the Twenty Fith International Conference on Surface Modification Technologies - SMT25: Trolhättan June 20-22, 2011, 2011, s. 59-70Konferansepaper (Fagfellevurdert)
  • 108.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Wigren, J.
    Characterization of adhesion strenght and residual stresses of HVOF sprayed Inconel 718 for aerospace repair applications2007Inngår i: Thermal Spray 2007: Global Coating Solutions: Proceedings of the International Thermal Spray Conference, Springer , 2007, s. 588-593Konferansepaper (Annet vitenskapelig)
  • 109.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Östergren, L.
    Volvo Aero Corporation, Trollhättan.
    Relationships between process parameters, microstructure, and adhesion strength of HVOF sprayed IN718 coatings2011Inngår i: Journal of Thermal Spray Technology, Vol. 20, nr 1-2, s. 76-82Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fundamental understanding of relationships between process parameters, particle in-flight characteristics, and adhesion strength of HVOF sprayed coatings is important to achieve the high coating adhesion that is needed in aeronautic repair applications. In this study, statistical Design of Experiments (DoE) was used to identify the most important process parameters that influence adhesion strength of IN718 coatings sprayed on IN718 substrates. Special attention was given to the parameters combustion ratio, total gas mass flow, stand-off distance and external cooling, since these parameters were assumed to have a significant influence on particle temperature and velocity. Relationships between these parameters and coating microstructure were evaluated to fundamentally understand the relationships between process parameters and adhesion strength. © 2010 ASM International.

  • 110.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Östergren, L.G.
    Volvo Aero Corporation, Trollhättan.
    Adhesion strength of HVOF sprayed IN718 coatings2012Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 21, nr 1, s. 86-95Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The adhesion strength of high-velocity oxyfuel thermally sprayed coatings is of prime importance when thick coatings are to be sprayed in repair applications. In this study, relationships between process parameters, particle in-flight characteristics, residual stresses, and adhesion strength were explored. The most important process parameters that influence HVOF sprayed IN718 coating adhesion strength on IN718 substrate material were identified. Residual stress distributions were determined using the modified layer removal method, and adhesion strength was measured using an in-house-developed tensile test. Relationships between process parameters, particle in-flight characteristics, coating microstructure, and adhesion strength were established. Particle temperature, particle velocity, substrate preparation, and deposition temperature were identified as critical parameters to attain high adhesion strength. Controlling these parameters can significantly improve the adhesion strength, thus enabling thick coatings to be sprayed for repair applications. © 2011 ASM International.

  • 111.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Sato, Katu
    Fujimi Incorporated, Japan.
    Screening design of hard metal feedstock powders for supersonic air fuel processing2014Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 258, nr 15 November, s. 447-457Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Replacement of Electrolytic Hard Chromium (EHC) method by Thermal Spray Technology has shown a growing interest the past decades, mainly pioneered by depositing WC-based material by conventional HVOF processes. Lower thermal energy and higher kinetic energy of sprayed particles achieved by newly-developed Supersonic Air Fuel system, so-called HVAF-M3, significantly reduces decarburization, and increases wear and corrosion resistance properties, making HVAF-sprayed coatings attractive both economically and environmentally. In the present work, a first order process map has been intended via a full factorial Design of Experiments (DoE) to establish relationships between powder feedstock characteristics, such as primary carbides grain size, binder grain size and powder strength, and coatings microstructure and mechanical properties. A second order process map was then established to study possible correlations between the deposit microstructural properties and their respective abrasion/erosion wear and corrosion performances.

  • 112.
    Lyphout, Christophe
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Sato, Kazuto
    Fujimi Incoporated.
    Houdkova, Sarka
    University of West Bohemia.
    Smazalova, Eva
    University of West Bohemia.
    Lusvarghi, Luca
    University of Modena and Reggio Emilia.
    Bolelli, Giovanni
    University of Modena and Reggio Emilia.
    Sassatelli, Paolo
    University of Modena and Reggio Emilia.
    Tribological Properties of Hard Metal Coatings Sprayed by High-Velocity Air Fuel Process2016Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, nr 1-2, s. 331-345Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lowering the thermal energy and increasing the kinetic energyof hard metal particles sprayed by the newly developed HVAF systems can significantly reduce their decarburization, and increases the sliding wear and corrosion resistance of the resulting coatings, making the HVAF technique attractive, both economically and environmentally, over its HVOF predecessors. Two agglomerated and sintered feedstock powder chemistries, WC-Co (88/12) and WC-CoCr (86/10/4), respectively, with increasing primary carbides grain size from 0.2 to 4.0 microns, have been deposited by the latest HVAF-M3 process onto carbon steel substrates. Their dry sliding wear behaviors and friction coefficients were evaluated at room temperature via Ball-on-disk (ASTM G99-90) wear tests against Al<inf>2</inf>O<inf>3</inf> counterparts, and via Pin-on-disk (ASTM G77-05) wear tests against modified martensitic steel counterparts in both dry and lubricated conditions. Sliding wear mechanisms, with the formation of wavy surface morphology and brittle cracking, are discussed regarding the distribution and size of primary carbides. Corrosion behaviors were evaluated via standard Neutral Salt Spray, Acetic Acid Salt Spray, accelerated corrosion test, and electrochemical polarization test at room temperature. The optimization of the tribological properties of the coatings is discussed, focusing on the suitable selection of primary carbide size for different working load applications. © 2015 ASM International

  • 113.
    Manvatkar, V.
    et al.
    The Pennsylvania State University, University Park, PA.
    Svensson, Lars-Erik
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    DebRoy, T.
    The Pennsylvania State University, University Park, PA.
    Cooling Rates and Peak Temperatures during Friction Stir Welding of a High Carbon Steel2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 94, s. 36-39Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Friction stir welding can potentially avoid post weld heat treatment for the welding of high carbon steels. Although control of both peak temperature and cooling rate has been suggested to achieve this goal, the current literature does not provide any help to select appropriate welding variables. In order to address this problem, here we present a set of easy-to-use maps of both the cooling rates and the peak temperatures for various welding conditions during friction stir welding of a high carbon steel.

  • 114.
    Markocsan, Nicolaie
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylen, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Wigren, J.
    Volvo Aero Corporation, Trollhättan, Sweden.
    Xin-Hai, Li
    Siemens Industri Turbomachinery AB, Finspång, Sweden.
    Tricoire, A.
    Volvo Aero Corporation, Trollhättan, Sweden.
    Klement, Uta
    Chalmers University.
    Yao, Y.
    Chalmers University.
    Effect of Heat Treatment on Low Conductive Thermal Barrier Coatings2009Inngår i: Surface Modification Technologies XXII: Proceedings of the Twenty Second International Conference on Surface Modification Technologies Held at University West, Trollhättan, Sweden September 22-24, 2008 / [ed] T.S. Sudarshan & Per Nylen, VALAR Docs , 2009, s. 139-147Konferansepaper (Fagfellevurdert)
  • 115.
    Markocsan, Nicolaie
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för process- och produktutveckling.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Vuoristo, Petri
    Overview of thermal spray activity in the European Nordic countries2010Inngår i: Proceedings of the 4th International Conference – Innovative technologies for joining advanced materials, ISSN 1844-4938, s. 109-115Artikkel, forskningsoversikt (Fagfellevurdert)
  • 116.
    Markocsan, Nicolaie
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Wigren, J.
    Volvo Aero Corporation, Trollhättan.
    Li, X. H.
    Siemens Industrial Turbomachinery AB, Finspång.
    Tricoire, A.
    Volvo Aero Corporation, Trollhättan.
    Effect of thermal aging on microstructure and functional properties of zirconia-base thermal barrier coatings2009Inngår i: Journal of Thermal Spray Technology, Vol. 18, nr 2, s. 201-208Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    .

  • 117.
    Medricky, Jan
    et al.
    Czech Technical University in Prague, Prague, Czech Republic.
    Curry, Nicholas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik.
    Pala, Zdenek
    Institute of Plasma Physics AS CR, Prague, Czech Republic.
    Vilemova, Monika
    Institute of Plasma Physics AS CR, Prague, Czech Republic.
    Chraska, Tomas
    Institute of Plasma Physics AS CR, Prague, Czech Republic.
    Johansson, Jimmy
    GKN Aerospace Engine Systems, Trollhättan, Darrasa, Sweden.
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Optimization of High Porosity Thermal Barrier Coatings Generated with a Porosity Former2015Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 24, nr 4, s. 622-628Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Yttria-stabilized zirconia thermal barrier coatings are extensively used in turbine industry; however, increasing performance requirements have begun to make conventional air plasma sprayed coatings insufficient for future needs. Since the thermal conductivity of bulk material cannot be lowered easily; the design of highly porous coatings may be the most efficient way to achieve coatings with low thermal conductivity. Thus the approach of fabrication of coatings with a high porosity level based on plasma spraying of ceramic particles of dysprosia-stabilized zirconia mixed with polymer particles, has been tested. Both polymer and ceramic particles melt in plasma and after impact onto a substrate they form a coating. When the coating is subjected to heat treatment, polymer burns out and a complex structure of pores and cracks is formed. In order to obtain desired porosity level and microstructural features in coatings; a design of experiments, based on changes in spray distance, powder feeding rate, and plasma-forming atmosphere, was performed. Acquired coatings were evaluated for thermal conductivity and thermo-cyclic fatigue, and their morphology was assessed using scanning electron microscopy. It was shown that porosity level can be controlled by appropriate changes in spraying parameters.

  • 118.
    Musalek, Radek
    et al.
    Department of Materials Engineering, Institute of Plasma Physics AS CR, v.v.i, Za Slovankou 3, 182 00, Praha 8, Czech Republic.
    Kovarik, Ondrej
    Czech Technical University in Prague, Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Trojanova 13, 120 00, Praha 2, Czech Republic.
    Medricky, Jan
    Czech Technical University in Prague, Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Trojanova 13, 120 00, Praha 2, Czech Republic.
    Curry, Nicholas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik.
    Björklund, Stefan
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Fatigue Performance of TBC on Structural Steel Exposed to Cyclic Bending2014Inngår i: Proceedings of the International Thermal Spray Conference, ASM International, 2014, s. 880-885Konferansepaper (Fagfellevurdert)
    Abstract [en]

    For applications with variable loading, fatigue performance of coated parts is of utmost importance. In this study, fatigue performance of conventional structural steel coated with thermal barrier coating (TBC) was evaluated in cyclic bending mode by "SF-Test" device. Testing was carried out for as-received and grit-blasted substrates, as well as for samples with Ni-based bond-coat and bond-coat with YSZ-based top-coat. Comparison of results obtained for different loading amplitudes supplemented by fractographic analysis enabled identification of dominating failure mechanisms and evaluation of fatigue resistance alteration due to the deposited coatings.

  • 119.
    Nilsson, Håkan
    et al.
    Chalmers University of Technology.
    Choquet, Isabelle
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Sass-Tisovskaya, Margarita
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Implementation of a 3D solver for electric arc welding, coupling fluid mechanics with electromagentics2011Inngår i: 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics. HEFAT2011: Mauritius, 11-13 july 2011, 2011, s. 614-620Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes the implementation of a 3D numerical solver for electric arc welding, where the fluid mechanics of the shielding gas is strongly influenced by the electromagnetic fields. The implementation is done in the OpenFOAM-1.6.x OpenSource Computational Fluid Dynamics (CFD) tool (www.openfoam.com). OpenFOAM is basically a general library of C++ classes for numerical simulation of continuum mechanic problems, but it is mainly used in CFD. The basics of high-level programming in OpenFOAM is described briefly, while the main components of the implementation done in the present work are described in high detail. The implementation is validated against an analytical solution of the electromagnetic field of an infinite electrically conducting rod, and against an experimental study of GTAW (Gas Tungsten Arc Welding). The numerical results agree very well with both the analytical and experimental results. A grid-dependency study has been made for the GTAW case, showing that the main features of the presented solutions are independent of the mesh size.

  • 120.
    Nilsson, Stefan
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för medier och design.
    Hattinger, Monika
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Bernhardsson, Lennarth
    Högskolan Väst, Institutionen för ekonomi och it, Avd för medier och design.
    Pongolini, Malin
    Högskolan Väst, Institutionen för ekonomi och it, Avd för informatik.
    Svensson, Lars
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Designing the CloudBoard: an ICT Tool for Online Tutoring in Higher Education2011Inngår i: Proceedings of Society for Information Technology & Teacher Education International Conference 2011 / [ed] Matthew Koehler & Punya Mishra, Chesapeake, VA: AACE , 2011, s. 589-592Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper concerns online tutoring in higher education. Observation studies of online tutoring sessions in two masters level engineering courses were conducted where teachers on campus tutored students located at different manufacturing plants doing their masters project. The tutoring regarded problems surrounding the construction of advanced 3D-models for manufacturing and required the shared view of the 3D-models as well as synchronous voice communication, e-mail and image sharing using a flora of different services. While advanced screen sharing applications like WebEX and TeamViewer were central in the tutoring sessions, the research presented here focus on the tools that supplemented the use of the screen sharing applications. Addressing issues such as the need to record historical data to be able for teachers to follow the progression of the project, sharing media files between participants and discussing the results, we here present a system to support online tutoring in higher education.

  • 121.
    Nordström, Michael
    et al.
    Saab Automobile AB.
    Järvstråt, Niklas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    An appearance-based measure of surface defects2009Inngår i: International Journal of Material Forming, Vol. 2, nr 2, s. 83-91Artikkel i tidsskrift (Fagfellevurdert)
  • 122.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Applications of thermal spray technology for aerospace and automotive industry2013Inngår i: Heat Treatment and Surface Engineering - Proceedings of Heat Treatment and Surface Engineering, HTSE 20132013: HT & SE 2013, 16 to 18 May 2013, Chennai Trade Centre, Chennai, India / [ed] Bakshi S.R.,Kamaraj M.,Mudali U.K.,Sudarshan T.S.,Raj B.,Murty B.S., ASM International, 2013, s. 65-68Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Thermal spraying can provide thick coatings (approx. thickness range is 20 micrometers to several mm, depending on the process and feedstock), over a large area at high deposition rate as compared to other coating processes such as electroplating, physical and chemical vapour deposition. Coating materials available for thermal spraying include metals, alloys, ceramics, ptastics and composites Thermal spraying provides engineered coating solutions for a wide range of industrial applications. The aerospace industry was one of the first to exploit the benefits of thermal spray coatings. Nowadays, thermal spray technology is used in a large number of applications within this industry meeting high performance and quality requirements. Examples of applications within the aerospace sector are landing gears, abrasion wear resistant coatings, engines (combustion liners, discharge nozzles, blades, and compressor casings), and wing structures. An emerging application area for thermal spraying is the automotive area. Examples of applications within this area are synchronisation rings, piston rings, cylinder heads, turbocharger abradables, brake discs, cylinder bores, and hard chrom replacement This talk discusses some thermal spray applications within the aerospace and automotive sectors.

  • 123.
    Nylén, Per
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Östergren, Lars
    Relationships between Process Parameters, Microstructure and Adhesion Strength of HVOF Sprayed IN718 Coating2010Inngår i: Proceedings of the 2010 International Thermal Spray Conference,: Singapore 3-5 May, 2010 / [ed] Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, 2010, s. 1-7Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Fundamental understanding of relationships between process parameters, particle in-flight characteristics, and adhesion strength of HVOF sprayed coatings is important to achieve the high coating adhesion that is needed in aeronautic repair applications. In this study, statistical Design of Experiments (DoE) was used to identify the most important process parameters that influence adhesion strength of IN718 coatings sprayed on IN718 substrates. Special attention was given to the parameters combustion ratio, total gas mass flow, stand-off distance and external cooling, since these parameters were assumed to have a significant influence on particle temperature and velocity. Relationships between these parameters and coating microstructure were evaluated to fundamentally understand the relationships between process parameters and adhesion strength.

  • 124.
    Pejryd, Lars
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). Örebro University.
    Beno, Tomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Carmignato, Simone
    University of Padova, I 35131 Padova, Italy .
    Computed Tomography as a Tool for Examining Surface Integrity in Drilled Holes in CFRP Composites2014Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 13, s. 43-48Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In light weight structures the joining of composite materials and of composites to metals are key technologies. A manufacturing method associated with joining is the drilling of holes. The hole creation in CRFP through drilling is associated with several defects related to the process, both on the entry and exit sides of the hole and also with dimensional and surface roughness issues of the hole wall. The detection of damage due to the process is not trivial. Especially interesting is non-destructive methods. In this work X-ray computed tomography is used to determine defects due to drilling of holes in a CFRP composite using twist drills with different geometrical features at different drilling parameters. The results can be used to establish relationship between different geometrical features of drills in combination with cutting parameters and resulting surface integrity of holes. © 2014 The Authors. Published by Elsevier B.V.

  • 125.
    Pejryd, Lars
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Beno, Tomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Isaksson, Marina
    CAPE.
    Machining aerospace materials with room-temperature and cooled minimal-quantity cutting fluids2011Inngår i: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 225, nr 1, s. 74-86Artikkel i tidsskrift (Fagfellevurdert)
  • 126.
    Pejryd, Lars
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Repo, Jari
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Beno, Tomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Machine Tool Internal Encoders as Sensors for the Detection of Tool Wear2012Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 4, s. 46-51Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tool wear in machining changes the geometry of the cutting edges, which effect the direction and amplitudes of the cutting forcecomponents and the dynamics in the machining process. These changes in the forces and dynamics are picked up by the internalencoders and thus can be used for monitoring of changes in process conditions. This paper presents an approach for the monitoringof a multi-tooth milling process. The method is based on the direct measurement of the output from the position encoders availablein the machine tool and the application of advanced signal analysis methods.

    The paper investigates repeatability of the method developed and how to detect wear in an individual tooth in a milling cutter. Theresults of this work show that various signal features which correlate with tool wear can be extracted from the first few oscillatingcomponents, representing the low-frequency components, of the machine axes velocities. The responses from the position encodersexhibit good repeatability, especially short term repeatability while the long-term repeatability is more unreliable. A worn toothincreases the irregularity in the encoder responses and can be identified at an early stage of the cut.

  • 127.
    Repo, Jari
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Condition monitoring of machine tools and machining processes using internal sensor signals2010Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 128.
    Repo, Jari
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Beno, Tomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Pejryd, Lars
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Machine tool and process condition monitoring using Poincaré maps2010Inngår i: COMA'10, International Conference on Competitive Manufacturing: Stellenbosch, South Africa, 3-5 February 2010, 2010Konferansepaper (Annet vitenskapelig)
  • 129.
    Repo, Jari
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Beno, Tomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Pejryd, Lars
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    New Aspects on Condition Monitoring of Machine Tools and Machining Processes2009Inngår i: The Swedish Production Symposium (SPS'09): 2-3 dec,  Göteborg, 2009, s. 27-33Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    A general trend within the manufacturing community and in particular the aerospace industry is that the requirements on the manufacturing of components are subjected to ever tighter tolerances and surface integrity restrictions. In order to fulfil these requirements a lot of effort has been carried out to non destructive testing of the produced part. However, the final objective in the first place must be to assure a robust process. One way to achieve a robust process is to continuously monitor it. This may require additional sensors which increase complexity and adds cost. This paper presents suggestions and experimentally achieved results into the extended use of already existing sensors in the machine tool. The basic idea is to show how these sensors can provide additional information about the machine tool itself and how they can be used for monitoring the process as well as to support maintenance activities. The Poincaré analysis method is applied to the position encoder signals to reveal the underlying dynamics when the machine tool structure is excited with a periodically varying load.

  • 130.
    Ryberg, Anders
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Eriksson, Kenneth
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för lantmäteriteknik och matematik.
    Nilsson, Jim
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Larsson, Matthias
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Stereo vision for path correction in off-line programmed robot welding2010Inngår i: Proceedings of the IEEE International Conference on Industrial Technology, 2010, s. 1700-1705Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The paper describes a versatile machine vision system for correcting off-line programmed nominal robot trajectories for advanced welding. Weld trajectory corrections are needed due to slight variations in weld joints. Such variations occur naturally because of varying tolerances in parts and to heat induced deformations during earlier weld sequences. The developed system uses one camera and a weld tool mounted on the robot hand. As a first step, the whole system, including the camera, is calibrated. Then the system takes images of the weld joint from different positions and orientations, and determines the weld joint geometry in 3D using a stereo vision algorithm and a novel camera model. The weld trajectory is then updated in the robot control system, and weld operation is performed. These steps are repeated for all weld sequences of the work piece. The strategy has successfully been demonstrated for a standard industrial welding robot and a standard FireWire CMOS camera. The maximum deviation of the trajectory found by the system compared to a reference (coordinate measuring machine) is 0.7 mm and the mean deviation is 0.23 mm. Thus, the system shows high potential for industrial implementation. ©2010 IEEE.

  • 131.
    Sadeghimeresht, Esmaeil
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Joshi, Shrikant V.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Isothermal oxidation behavior of HVAF-sprayed Ni and NiCr coatings in H2-H2O environment2017Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 317, s. 17-25Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The formation of a protective chromia scale on stainless steels is known to be suppressed by the presence of water vapor in reducing conditions. Thermal spray coatings present a promising approach to improve the durability of steels by transferring the first line of oxidation attack from the bulk steel to the coating. In the present work, isothermal oxidation behavior of Ni and NiCr coatings deposited by High-Velocity Air Fuel (HVAF) process on 304L stainless steel was investigated at 600 degrees C for 168 h. Ar-10%H-2-20%H2O was selected as the oxidation environment to study the oxidation behavior of the coatings in a low pO(2) environment containing H2 and H2O. BIB/ SEM, EDS, and XRD techniques were used to characterize the as-sprayed coatings and to investigate the oxidation mechanisms in the coated samples. Results showed that both Ni and NiCr coatings imparted oxidation protection to the 304L substrate. The chromia-forming 304L steel presented a duplex but non-protective oxide scale comprising of an outer Fe3O4 layer on an inner (Fe, Cr)(3)O-4-spinel oxide. In contrast, the NiCr coating presented superior oxidation behavior due to the formation of a continuous, thin, and slow-growing Cr2O3 scale. The Ni coating, too, protected the substrate owing to limited nucleation and growth of the deleterious NiO scale in the low-oxygen -activity environment. (C) 2017 Elsevier B.V. All rights reserved.

  • 132.
    Sadeghimeresht, Esmaeil
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    HVAF thermal spray Fe-based coating: An environmentally acceptable alternative to cobalt-based coating2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Fe-based coatings were widely used in the corrosive environment of various indus-tries. It was replacing expensive cobalt-based alloys, which face a ban in the future due to serious health and environmental risks. The aim of the present work was to compare low temperature corrosion behavior of some Fe- and Co-based coatings produced by High-Velocity Air Fuel (HVAF) thermal spraying. Polarization and elec-trochemical impedance spectroscopy (EIS) tests were carried out in 3.5 wt.% NaCl solution at 25°C. The microstructures were analyzed using optical microscopy (OM) and scanning electron microscopy (SEM) to characterize the morphologies of both Fe- and Co-based coatings and analyze the exposed products along the surface and cross-section of specimens. The results revealed that the high-chromium Fe-based coating protected the underlying substrate better than Co-based coating.

  • 133.
    Sadeghimeresht, Esmaeil
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Dizdar, S.
    Höganäs AB, Höganäs.
    Corrosion behavior of high-chromium Fe-based coatings produced by HVAF thermal spraying technique2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Fe-based coatings with different Cr content were prepared by high-velocity air fuel (HVAF) spraying on the surface of both carbon steel and stainless steel 304L. The corrosion behavior of the coatings were evaluated using polarization and electrochemical impedance spectroscopy (EIS) techniques in 3.5 wt.% NaCl solution. Microstructure of the coatings were evaluated by X-ray diffraction (XRD), optical microscopy (OM), scanning election microscopy (SEM), and Energy-dispersive X-ray spectroscopy (EDS) before and after corrosion testing. The experimental results indicated that Cr strongly increased the corrosion resistance of the coating. Furthermore, having an elemental composition closer to that of the substrate, the coatings showed lower susceptibility to galvanic corrosion, accordingly lower corrosion rate.

  • 134.
    Sass-Tisovskaya, Margarita
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Plasma arc welding simulation with OpenFOAM2009Licentiatavhandling, monografi (Annet vitenskapelig)
  • 135.
    Segerstark, Andreas
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Andersson, Joel
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Svensson, Lars-Erik
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Economical Viability of Laser Metal Deposition2014Inngår i: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Reports on large economic savings using Additive Manufacturing (AM) has been found in literature when exploiting the positive capabilities of AM. This paper evaluates the economic potential of, the AM method, laser metal deposition (LMD) in production of add-on features compared to conventional manufacturing methods. This is done by theoretical case studies, which explore factors critical to the cost of manufacturing a jet engine flange. LMD has the potential to be an economical viable alternative to conventional manufacturing methods when the manufactured component has a high buy-to-fly ratio, the component is small and complex, if the operator time can be kept to a minimum, and/or when the design freedom of LMD can be capitalized into lighter and more efficient components.

  • 136.
    Sigvant, Mats
    et al.
    Volvo Cars.
    Mattiasson, Kjell
    Chalmers Tekniska Högskola.
    Larsson, Mats
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Determination of the formability of DP-steels by a combination of experimental methods and FE-simulations2010Inngår i: International Conference of International Deep-Drawing Research Group : IDDRG 2010: Austria, Graz, 31May - 2 June, Graz: Verlag der Technischen Universitat Graz , 2010, s. 195-204Konferansepaper (Annet vitenskapelig)
  • 137.
    Sikström, Fredrik
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automationssystem.
    Hurtig, Kjell
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Svensson, Lars-Erik
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Heat input and temperatures in welding2013Inngår i: JOM-17 - International Conference on Joining Materials, JOM-Institute , 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A key feature in welding is the energy supplied, in order to join the work pieces together. For all fusion welding methods, the supplied energy is so high that the work-piece joint surfaces are melted and fused together. The energy supplied is then transported away, mainly by conduction through the base materials. The temperature of the weld decreases and a solid joint is eventually formed. This may then undergo phase transformations and finally the weld joint reaches ambient temperature.

    The thermal history of a welded joint has a large effect on the microstructure and mechanical properties. Welding metallurgist therefore consider the cooling time t8/5 as crucial to understand the resulting properties of a joint in steel structures. The cooling time is influenced by several factors, like heat input, base material thickness, base material thermal properties, preheat an interpass temperatures etc. Regarding the heat input, the efficiency of the welding arc has for a long time been debated, i.e. how much of the arc energy really goes into the weld. Large efforts are being made to measure this very accurately.

    Another significant research field has been to measure or calculate the cooling time of welds, in particular t8/5. However, this cooling time is affected by the arc energy and by the arc efficiency.

    In a more macroscopic sense, it has been shown that the temperature of a welded structure can vary with the presence of for example internal heat sinks. Such variations may affect macroscopic properties like penetration. One way to ensure constant condition in terms of temperature could be to increase the heat input if the temperature decreases. However, how such variations affect for example the cooling rate has not been studied.The aim of the present paper is to report some experimental results regarding cooling rate in welded joints and put this into context of arc efficiency and temperature regulations and also discuss how the cooling rate may be affected in more production like welding situations.

  • 138.
    Soron, Mikael
    et al.
    ESAB Welding AB .
    De Backer, Jeroen
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för process- och produktutveckling.
    Ilar, Torbjörn
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    A local model for online path corrections in friction stir welding2010Inngår i: INTERNATIONAL CONFERENCE ON SCIENTIFIC AND TECHNICAL ADVANCES ON FRICTION STIR WELDING AND PROCESSING. Program.http://www.polytech-lille.fr/IMG/pdf/program.pdf, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Friction stir welding (FSW) has always been associated with high forces and rigid machines Today’s trends towards joining of more complex structures in e.g. the automotive and aerospace industry, the applications require machinery with increased dexterity and flexibility, which cannot be achieved with the traditional FSW systems. But the introduction of more flexible machines, with more complex workspace capacity, will lead to undesired tool path deviations and in worst case a weld seam with inferior quality. In this study an industrial robot system is used to emphasise the need to compensate for the deviations caused by the high lateral forces resulting from the FSW process. A local model to compensate for such deviations is implemented, evaluated and compared to uncompensate welds in terms of quality and reliability.

  • 139.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Cost Sensitivity Modelling in welding production2012Inngår i: Proceedings of the 5th International Swedish Production Symposium: 6th-8th of November 2012 Linköping, Sweden / [ed] Mats Björkman, Linköping, 2012, s. 349-356Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of Cost Sensitivity Modelling (CSM) is to analyse the relevance of input data in weld cost or production investment calculations, and to show through different calculations how the final result is influenced by variations in input data in order to find the most important cost/profitability determining parameters. Today’s welding production systems are complex installations both in terms of  technology, day-to-day operation, maintenance and investment. This is evident with processes such as Tandem-MAG and Laser-hybrid MAG welding. During the past decades, the profitability of investment is more in focus than, for example, production cost per m weld length or produced unit. CSM can be applied in conventional weld cost calculations (cost/m produced weld) or in complex investment calculations. In this paper both cases are analysed to demonstrate the usefulness of the method. Two crucial questions arise as a consequence of CSM: how accurate is the input data used and which cost factor(s) are of prime importance? It is shown, for example, that deposition rate is not the only important cost determining factor in sophisticated welding systems. CSM identifies other factors which must be controlled in order to keep deviations in profitability from target value within acceptable limits. Implementation time in a new investment is one such factor.

  • 140.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Hitsaustalous ja touttavuus2011Bok (Fagfellevurdert)
  • 141.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Känslighetsanalys vid svetsekonomiska beräkningar2011Inngår i: Svetsen, ISSN 0039-7091, nr 3, s. 29-32Artikkel i tidsskrift (Annet vitenskapelig)
  • 142.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Lönar det sig?: Investeringsberäkningar2011Inngår i: Svetsen, ISSN 0039-7091, nr 1, s. 13-16Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 143.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Svetsa i äldre stålkonstruktioner2012Inngår i: Svetsen, ISSN 0039-7091, nr 3, s. 26-27Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [sv]

    Vad menas med "äldre stål", varför kan det vara aktuellt att titta närmare på deras svetsbarhet och hållfasthet, samt vad bör man då beakta? Uppenbara anledningar till varför det kan vara aktuellt är att man måste bygga om reparera eller göra tillbyggnader av äldre stålkonstruktioner. Ibland kan dessa vara av ett historiskt värde och K-märkta.

  • 144.
    Stenbacka, Nils
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Svetsekonomi och produktivitet2009 (oppl. 1000)Bok (Fagfellevurdert)
  • 145.
    Stenbacka, Nils
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Choquet, Isabelle
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik.
    Hurtig, Kjell
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik. Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV).
    Review of Arc Efficiency Values for Gas Tungsten Arc Welding2012Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The aim of this study was to review the literature that specifies arc efficiency values for gas tungsten arc welding (GTAW) and, if possible, propose a plausible value range. The literature review covered the years between 1955 and 2011, and showed that the arc efficiency values published lie in a wide range. Values between 0.36 and 0.90 were found for GTAW DCEN. Only a few studies covered DCEP and AC current welding. Specific information about the reproducibility of calorimetric studies was scarce (considering both random and systematic errors). A plausible arc efficiency range (95% confidence) for GTAW DCEN was estimated to be 0.73 – 0.82 with an average value of 0.78. The arc efficiency is lowered by longer arcs (increased arc gap). Reports describing the influence of arc current and travel speed, however, conflict. The GTAW process with DCEN is an efficient welding method.

    Fulltekst (pdf)
    fulltext
  • 146. Sudarshan, T.S.
    et al.
    Nylen, PerHögskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Surface Modification Technologies XXII: Proceedings of the Twenty Second International Conference on Surface Modification Technologies  Held at University West, Trollhättan, Sweden September 22-24, 20082009Konferanseproceedings (Annet vitenskapelig)
  • 147.
    Svensson, Lars-Erik
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Karlsson, Leif
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Harati, Ebrahim
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Increasing fatigue life using Low Transformation Temperature (LTT) welding consumables,2013Inngår i: 2nd Swedish conference on design and fabrication of welded structures: Conference proceedings / [ed] Zuheir Barsoum, Stockholm, 2013, s. 49-64Konferansepaper (Annet vitenskapelig)
  • 148.
    Svensson, Lars-Erik
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Karlsson, Leif
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för naturvetenskap, lantmäteri- och maskinteknik.
    Soder, R.
    Department of Chassis & Vehicle Dynamics, Volvo Group Trucks Technology, SE-40508, Göteborg, Sweden.
    Welding enabling light weight design of heavy vehicle chassis2015Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 20, nr 6, s. 473-482Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Development of lightweight cars for saving fuel and reducing emission has been a priority for more than a decade. A similar trend is now seen for heavy vehicles. Here, however, the chassis rather than the cab is in focus, since this is by far the heaviest part of the vehicle. Using welding fabrication has many advantages like larger freedom in choice of material and more compact design. However, there are also factors like fatigue strength, residual stresses and geometric distortion, which must be addressed. There are large potentials to save weight in heavy vehicles by utilising high strength steels or aluminium alloys. In general, existing joining methods can be used, but new filler materials or recently developed post-weld treatments may be necessary to fulfil the demands on the components. In this paper, two examples are given, showing possible weight reduction solutions. In both cases, welding plays a central role.

  • 149.
    Valiente Bermejo, María Asunción
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    DebRoy, Tarasankar
    University Park, Department of Materials Science and Engineering, The Pennsylvania State University, State College PA 16801, USA.
    Hurtig, Kjell
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser.
    Karlsson, Leif
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Svensson, Lars-Erik
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Towards a Map of Solidification Cracking Risk in Laser Welding of Austenitic Stainless Steels2015Inngår i: Physics Procedia, ISSN 1875-3892, E-ISSN 1875-3892, Vol. 78, s. 230-239Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, two series of specimens with Hammar and Svensson's Cr- and Ni-equivalents (Creq+Nieq) = 35 and 45 wt% were used to cover a wide range of austenitic grades. These were laser welded with different energy inputs achieving cooling rates in the range of 103 °C/s to 104 °C/s. As high cooling rates and rapid solidification conditions could favour fully austenitic solidification and therefore raise susceptibility to solidification cracking, the solidification modes of the laser welded specimens were compared to the ones experienced by the same alloys under arc welding conditions. It was found that high cooling rates experienced in laser welding promoted fully austenitic solidification for a wider range of compositions, for example specimens with (Creq+Nieq) = 35% under arc welding cooling conditions at 10 °C/s showed fully austenitic solidification up to Creq/Nieq = 1.30, whilst the same specimens laser cooled at 103 °C/s showed fully austenitic solidification up to Creq/Nieq = 1.50 and those cooled at 104 °C/s showed it up to Creq/Nieq = 1.68. Therefore, high cooling rates extended the solidification cracking risk to a wider range of Creq/Nieq values. This work also compares the cooling rates experimentally determined by thermocouples to the computed cooling rates calculated by a highly-advanced computational model. The distance between the thermocouple's wires and the thermal resistance of thermocouples together with the small size of the weld pools proved to be practical limitations in the experimental determination of cooling rates. However, an excellent agreement was found between computed and experimental solidus isotherms at high energy input settings. For low energy input settings cooling rate was in the order of magnitude of 104 °C/s, whilst for high energy input settings cooling rate was found to be in the order of magnitude of 103 °C/s.

  • 150. Vassen, Robert
    et al.
    Cernuschi, Federico
    Rizzi, Gabriele
    Markocsan, Nicolaie
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Östergren, Lars
    Kloosterman, Arien
    Mevrel, Remy
    Feist, Jorg
    Nicholls, John
    Overview in the field of thermal barrier coatings including burner rig testing in the European Union2008Inngår i: Ceramics Japan, ISSN 0009-031X, Vol. 43, nr 5, s. 371-382Artikkel i tidsskrift (Annet vitenskapelig)
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