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  • 251.
    Svensson, Lars-Erik
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Karlsson, Leif
    University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Harati, Ebrahim
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Increasing fatigue life using Low Transformation Temperature (LTT) welding consumables,2013In: 2nd Swedish conference on design and fabrication of welded structures: Conference proceedings / [ed] Zuheir Barsoum, Stockholm, 2013, p. 49-64Conference paper (Other academic)
  • 252.
    Söder, Heléne
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Implementering av kvalitetsinspektion med kamera2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study was conducted at Dahréntråd in the spring of 2014. At Dahréntråd round and squared winding wire is enameled. During this process enamel lumps can appear which can cause complaints from customers. On two horizontal machines for enameling square wire two lump indicators with cameras were installed before this study was initiated. The pur-pose of this study was to study the lump indicators, propose improvements to them and to create a plan for implementing them as well as a work description on how to handle them when implemented. The goal was for Dahréntråd to be able to use this study as a basis to successfully implement the system on all twelve machines in the machine park.

    The study was carried out according to Gershon et. al. [6] view on improvement work. The first step, to define which process to improve on, was performed by Dahréntråd before the start of this study. The second step, to study the conditions of the process and produce suggestions for improvements of the process, corresponds to the situation analysis and the improvement work performed during this study. The third step, to implement the im-provements, falls outside of the time frame of this study and will be performed by Dahréntråd.

    The situation analysis consisted of interviews and observations of relevant personnel. The result was an identification of improvement possibilities. These possibilities were the foun-dation of the improvement work which was conducted as a concept generation process. The result of the improvement work was the following improvement proposals:

    • To generate a signal to the operator's pager when a lump is detected.

    • To install a screen with the history of all twelve machines.

    • To shorten the previous cooling system and add a lid to it.

    • To change the placement of the cooling system.

    • To include the lump indicators in to the existing process control of the machine park.

    • To define and evaluate the systems boundaries for detecting lumps.

    • To produce a gauge block for assessments of lumps.

    A work description according to Dahréntråd's existing ones has been produced as well as an implementing plan for the improvement proposals

  • 253.
    Tammpere, Erik
    et al.
    University West, Department of Engineering Science.
    Carlsson, William
    University West, Department of Engineering Science.
    Utformning av monteringsbana genom konceptutveckling2024Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a concept model has been developed for an assembly line at the variable pump section at the company Parker Hannifin Manufacturing Sweden AB in Trollhättan. At the assembly line currently in use, it is possible to see potential for improvement regarding effectivity, productivity and ergonomics. Because of the material being moved back and forth several times between different assembly operations and by using a batch flow, it is possible to see that the material that is passing through the assembly line, must wait between the different assembly operations before any value-adding activity is performed on it. The flow through the current assembly line is a mix of batch flow and one-piece flow. The purpose of the thesis was to investigate if the developed concept model enabled a one-piece flow throughout the entire assembly line and whether it improved ergonomics, efficiency, and productivity during assembly.

    The concept development consisted of several activities that together constituted the so-called front-end process. Here, the concept requirements and customer need for the concept model were initially identified, which formed the basis for the establishment of target specifications. With respect to this, different concept ideas were then generated, which were later evaluated and compared against each other in different decision matrixes to find out which ones met the customer needs and target specifications to the highest degree. 

    The purpose of the study is achieved, which has been shown through improvements in ergonomics, productivity, and efficiency because of the developed concept model. The result is feasible but could be developed further through benchmarking at other companies that have solved similar problems, and through further concept developments. At a practical implementation of the presented concept model, Parker employees are evaluated to be able to work at an assembly flow that enables better working conditions for the assemblers and cost savings for the company.

  • 254.
    Travis, Fred
    et al.
    Maharishi University of Management, USA.
    Lagrosen, Yvonne
    University West, Department of Engineering Science, Division of Process and Product Development.
    Creativity and Brain-Functioning in Product Development Engineers: A Canonical Correlation Analysis2014In: Creativity Research Journal, ISSN 1040-0419, E-ISSN 1532-6934, Vol. 26, no 2, p. 239-243Article in journal (Refereed)
    Abstract [en]

    This study used canonical correlation analysis to explore the relation among scores on the Torrance test of figural and verbal creativity and demographic, psychological and physiological measures in Swedish product-development engineers. The first canonical variate included figural and verbal flexibility and originality as dependent measures and (a) higher scores on the brain integration scale, (b) faster speed of processing in an event-related potential task, (c) faster conflict-resolution during the Stroop task, (d) higher moral reasoning, and (e) higher manageability and lower comprehensibility as independent measures. Flexibility and originality reflect the ability to see old situations in new ways leading to unique responses. Greater mental adaptability was associated with greater brain integration and speed of processing along with higher moral reasoning and feeling of being in control. Future research could investigate effects of interventions that optimize brain integration on creative output across professions.

  • 255.
    Usino, Sunday Ogheneochuko
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Surface roughness in stable and unstable machining2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Surface roughness is an important aspect of a machined piece and greatly influences its performance. This thesis presents the surface roughness of 7075 T651 aluminium plate of 30 mm thickness in stable and unstable machining conditions at various spindle speed and depth of cut.

    The research is conducted by generating replicas using a high-resolution silicone compound applied on the aluminium plate and therefore obtaining its surface roughness. The replicas are then measured using the Profilm 3D microscope which uses the white light interferometery (WLI), a measurement technique to acquire a 3D scan of surface roughness for the Profilm3D from the replicas.

    A study of surface roughness data generated and its representation in graphs shows that with increasing spindle speed especially at lower depth of cut the surface roughness is lower and the increase in depth of cut increase surface roughness.

  • 256.
    Valiente Bermejo, María Asunción
    et al.
    University West, Department of Engineering Science, Division of Welding Technology.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Malmsköld, Lennart
    University West, Department of Engineering Science, Division of Production Systems.
    Scotti, Americo
    University West, Department of Engineering Science, Division of Welding Technology.
    University-industry collaboration in curriculum design and delivery: A model and its application in manufacturing engineering courses2021In: Industry & higher education, ISSN 0950-4222, E-ISSN 2043-6858, Vol. 36, no 5Article in journal (Refereed)
    Abstract [en]

    The advantages and importance of university-industry collaboration, particularly in curriculum design and delivery, are well-known. However, although curriculum development models are available in the literature, very few are sufficiently concrete to be applicable in practice or are generalizable beyond their discipline of origin. In this paper, a co-operative model based on the Plan-Do-Study-Act cycle is presented and described. An example of its application in the curriculum design of two courses in welding within a Manufacturing Engineering Master's program is detailed. The model was found successful based on the evaluation of the courses by students, teachers, and the industrial representatives involved. Therefore, it proved to be an effective tool for bridging the gap between industrial needs and academia in the field of Manufacturing Engineering education. At the same time, the methodology is generalizable and is applicable to any field of education.

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  • 257.
    Vallo Hult, Helena
    et al.
    University West, School of Business, Economics and IT, Divison of Law, Economics, Statistics and Politics.
    Master Östlund, Christian
    NU Hospital Group, Trollhattan (SWE).
    Towards Design Principles for the Three Phases of Physicians' Information Seeking Activities2021In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 12807 LNCS, p. 65-70Article in journal (Refereed)
    Abstract [en]

    Healthcare settings involve complex sociotechnical challenges, accentuated by rapidly expanding medical knowledge and technological developments. This entails a need for the professionals to continually seek information to update their skills and knowledge to solve problems in daily clinical practice while at the same time facing an increasingly fragmented health information environment. This research in progress paper addresses the real-life problem of physicians’ information seeking activities before, during and after a patient visit. The anticipated contribution is a set of design principles that a system for information seeking through these three phases should support. 

  • 258.
    Vassen, Robert
    et al.
    IEF-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Cernuschi, Federico
    CESI RICERCA, Power Generation Systems Dep. Milano, Italy.
    Rizzi, Gabriele
    Turbocoating.
    Scrivani, Andrea
    Turbocoating.
    Markocsan, Nicolaie
    University West, Department of Engineering Science, Division of Production Engineering.
    Östergren, Lars
    Surface Technology, Volvo Aero Corporation, Trollhättan, Sweden.
    Kloosterman, Arjen
    National Aerospace Laboratory NLR, Gas Turbines & Structural Integrity Department, Amsterdam, The Netherlands.
    Meverel, Remy
    ONERA, Chatillon Cedex, France.
    Feist, Jörg
    Southside Thermal Sciences (STS) Ltd, London, United Kingdom.
    Nicholls, John
    Cranfield University, Cranfield, United Kingdom.
    Recent activities in the field of thermal barrier coatings including burner rig testing in the european union.2008In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 10, no 10, p. 907-921Article, review/survey (Other academic)
  • 259.
    Wang, Yueyue
    University West, Department of Engineering Science, Division of Production System.
    Theoretical experiment of GISSMO failure model for Advanced High Strength Steel2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    When developing an electric vehicle, it is essential to evaluate the deformation in and around the battery box for different crash scenarios, and it is necessary to develop a more advanced model that would take into account all the stress modes. Thanks to the excellent properties of Advanced High Strength Steel (AHSS) combine with high strength for more safety and weight reduction for less exhaust emission, AHSS is more and more commonly used in automobile industry. The material employed in this project is DOCOL 900M and it is a martensitic steel with yield strength higher than 700MPa.  The focus of the current work is to describe the experimental setup for the GISSMO model used in LS-DYNA. A number of experimental methods and theories have been reviewed. Different geometries of the test specimens under different stress triaxialities have been discussed. The study also compares the accuracy and robustness of each of the testing methods and setups. The effect of anisotropy of materials on the mechanical properties was studied. Some summaries about how to reduce errors in the experiment under the conditions of low costing and high efficiency have been discussed. According to the stress-strain response of ductile materials, the parameters of plasticity model can be calibrated. The material can be implemented in finite element software to calibrate the parameters of damage and the prediction of material failure can be achieved. The experiment and simulation are always good to be used together in the research.

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  • 260.
    Wanner, Bertil
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Strategies for Reducing Vibrations during Milling of Thin-walled Components2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Factors such as environmental requirements and fuel efficiency have pushed aerospace industry to develop reduced-weight engine designs and thereby light-weight and thin-walled components. As component wall thickness gets thinner and the mechanical structures weaker, the structure becomes more sensitive for vibrations during milling operations. Demands on cost efficiency increase and new ways of improving milling operations must follow.

    Historically, there have been two “schools” explaining vibrations in milling. One states that the entry angle in which the cutting insert hits the work piece is of greater importance than the exit angle. The other states that the way the cutter leaves the work piece is of greater importance than the cutter entry. In an effort to shed some light over this issue, a substantial amount of experiments were conducted. Evaluations were carried out using different tools, different tool-to-workpiece offset positions, and varying workpiece wall overhang. The resultant force, the force components, and system vibrations have been analyzed.

    The first part of this work shows the differences in force behavior for three tool-to-workpiece geometries while varying the wall overhang of the workpiece. The second part studies the force behavior during the exit phase for five different tool-to-workpiece offset positions while the overhang is held constant. The workpiece alloy throughout this work is Inconel 718.

    As a result of the project a spread sheet milling stability prediction model is developed and presented. It is based on available research in chatter theory and predicts the stability for a given set of variable input parameters.

  • 261.
    Wanner, Bertil
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Mechanical Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Mechanical Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    University West, Department of Engineering Science, Division of Production Engineering.
    Cutter Exit Effects during Milling of Thin-walled Inconel 7182012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 590, p. 297-308Article in journal (Refereed)
    Abstract [en]

    During milling of thin-walled components, chatter vibrations give rise to process issues. These include dimensional inaccuracy, damaged and scrap parts, and damaged cutting tools. This, in turn, leads to loss of production time with increasing cost as a consequence. This paper identifies the force profile during a single cut milling process. It focuses on the exit and post-exit behavior of the cut and discusses the process dynamics. The force profiles of various tool-to-workpiece positions are analyzed as regards the exit and post exit phases. A standard on-the-market cutter and a specially designed zero rake cutter are used in the investigation. Finally, a time-domain simulation of the force is performed and compared to the experimental results. The study concludes that a small change in exit angle may result in a considerable improvement in cutting behavior. In addition, the tool position should be chosen so that the cutter exits in the least flexible direction possible for the workpiece.

  • 262.
    Wanner, Bertil
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    University West, Department of Engineering Science, Division of Production Engineering.
    Milling Strategies for Thin-walled Components2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 498, p. 177-182Article in journal (Refereed)
    Abstract [en]

    Recent developments in the Aerospace industry have led to thin-walled, reduced-weight engine designs. Due to demands in manufacturing, production speeds and material removal rates (MRR) have increased. As component wall thickness gets thinner, the consequence oftentimes is an increase in chatter vibrations. This paper suggests that a correctly chosen tool-to-workpiece offset geometry may lead to a robust and chatter-free process. The results show the differences in force response for three geometries while varying the overhang of the workpiece. This is part of a concerted effort to develop a robust methodology for the prediction of chatter vibrations during milling operations of thin-walled Aerospace components. This paper outlines certain robust machining practices. It also analyzes the criticality of the choice of offset between tool and workpiece during milling setup as well as the effects that the entry and exit of cut have on system vibrations.

  • 263.
    Wanner, Bertil
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    University West, Department of Engineering Science, Division of Production Engineering.
    Process Stability Strategies in Milling of Thin-walled Inconel 7182012In: The 4th Manufacturing engineering society international conference (MESIC 2011): 21–23 September 2011, Cadiz, Spain / [ed] M. Marcos, J. Salguero, American Institute of Physics (AIP), 2012, Vol. 1431, p. 465-472Conference paper (Refereed)
    Abstract [en]

    Trends in Aerospace development have led to thin-walled, reduced-weight engine designs. The demands in manufacturing have forced production speeds and material removal rates (MRR) to increase. As component wall thickness gets thinner, the consequence oftentimes is an increase in chatter vibrations. This paper suggests that a correctly chosen tool-to-workpiece offset geometry may lead to a robust and chatter free process. The results show the differences in force response for three geometries while varying the height overhang of the workpiece. This is part of a concerted effort to develop a robust methodology for the prediction of chatter vibrations during milling operations of thin-walled Aerospace components. This paper gives guidelines on how to accomplish robust machining practices. It also answers the following questions: How critical is the choice of offset between tool and workpiece during milling setup? And what effects do the entry and exit of cut have on system vibrations?

  • 264.
    Xin, Zhu
    University West, Department of Engineering Science, Division of Production System.
    Improvement of Automated Guided Vehicle's image recognition: Object detection and identification2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Automated Guided Vehicle(AGV) as a kind of material conveying equipment has been widely used in modern manufacturing systems. [1] It carries the goods between the workshop along the designated paths. The ability of localization and recognizing the environment around themselves is the essential technology. AGV navigation is developed from several technologies such as fuzzy theory, neural network and other intelligent technology. Among them, visual navigation is one of the newer navigations, because of its path laying is easy to maintain, can identify variety of road signs. Compared with traditional methods, this approach has a better flexibility and robustness, since it can recognition more than one path branch with high anti-jamming capability. Recognizing the environment from imagery can enhance safety and dependability of an AGV, make it move intelligently and brings broader prospect for it. University West has a Patrolbot which is an AGV robot with basic functions. The task is to enhance the ability of vision analysis, to make it become more practical and flexible. The project is going to add object detection, object recognition and object localization functions on the Patrolbot. This thesis project develops methods based on image recognition, deep learning, machine vision, Convolution Neural Network and related technologies. In this project Patrolbot is a platform to show the result, we can also use this kind of program on any other machines. This report generally describes methods of navigation, image segmentation and object recognition. After analyzing the different methods of image recognition, it is easy to find that Neural Network has more advantages for image recognition, it can reduce the parameters and shorting the training and analyzing time, therefore Convolution Neural Network was introduced detailly. After that, the way to achieve image recognition using convolution neural network was presented and in order to recognize several objects at the same time, an image segmentation was also presented here. On the other hand, to make this image recognition processes to be used widely, the ability of transfer learning becomes important. Therefore, the method of transfer learning is presented to achieve customized requirement.

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  • 265.
    Zachrisson, Jan
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Börjesson, J
    ESAB AB.
    Karlsson, Leif
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Role of inclusions in formation of high strength steel weld metal microstructures2013In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 18, no 7, p. 603-609Article in journal (Refereed)
    Abstract [en]

    A series of high strength weld metals with varying Al content are studied. The inclusions are characterised using energy dispersive X-ray analysis and electron diffraction. The tendency for alignment of the microstructure is characterised quantitatively using electron backscatter diffraction and a recently developed post-processing technique. Correlation is found between the inclusion phases present and the amount of aligned neighbouring grains in the microstructure. It is shown that amorphous Si-Al oxides form at low Al weld metal contents and an Mg-Al spinel at higher contents. The former is associated with less alignment of the microstructure and therefore higher impact toughness. The effect of these inclusions on the formation of the microstructure is discussed.

  • 266.
    Zafer, Yunus Emre
    University West, Department of Engineering Science, Division of Production Systems.
    Encapsulation of Surface Defects in Electron Beam Melting produced Alloy 7182019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Electron beam melting (EBM) is a rapidly growing metal additive manufacturing technology due to its ability to manufacture near net shape metal parts, especially from high-value materials like Alloy 718. Defects like porosities in the EBM manufactured Alloy 718 are inevitable to some extent and are of concern as they can degrade the mechanical properties of the part. Therefore, EBM manufactured Alloy 718 is typically subjected to post-processing to improve the properties of the as-built material in order to achieve the required performance of the parts. Hot isostatic pressing (HIP) is usually employed to close the defects. Nevertheless, it is widely known that the HIP treatment cannot close the open defects, which are connected to the environment of the material.

    Thus, the aim of this study was to investigate if the open defects in EBM built Alloy 718 can be encapsulated by application of a coating on the surface, to effectively close these during HIP treatment. The EBM manufactured Alloy 718 specimens were coated on two sides by high-velocity air fuel (HVAF) spraying using Alloy 718 powder and were HIPed. X-ray computed tomography analysis of the defects in the coated sample before and after HIP treatment showed that some of the defects connected to the EBM material surface were effectively encapsulated by the coating as they were closed after HIP treatment. However, some of these 'surface connected' defects were retained. The reason for such remnant defects could be their connection to the environment through the gap between the coating and the EBM material. The gap could have provided the path for argon infiltration from the uncoated sides during the HIP treatment, thereby hindering complete densification of the specimen. In addition, the lack of fusion defects were typically associated with inclusions, which could also be prevented their complete closure during HIP treatment.

  • 267.
    Zhao, Y.
    et al.
    University of Manchester, School of Materials.
    Shinmi, A.
    University of Manchester, School of Materials.
    Zhao, X.
    University of Manchester, School of Materials.
    Withers, P. J.
    University of Manchester, School of Materials.
    Van Boxel, S.
    University of Manchester, School of Materials.
    Markocsan, Nicolaie
    University West, Department of Engineering Science, Division of Production Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Xiao, Ping
    University of Manchester, School of Materials.
    Investigation of interfacial properties of atmospheric plasma sprayed thermal barrier coatings with four-point bending and computed tomography technique2012In: Surface and Coatings Technology, ISSN 0257-8972, Vol. 206, no 23, p. 4922-4929Article in journal (Refereed)
    Abstract [en]

    A modified four-point bending test has been employed to investigate the interfacial toughness of atmospheric plasma sprayed (APS) yttria stabilised zirconia (YSZ) thermal barrier coatings (TBCs) after isothermal heat treatments at 1150°C. The delamination of the TBCs occurred mainly within the TBC, several to tens of microns above the interface between the TBC and bond coat. X-ray diffraction analysis revealed that the TBC was mainly tetragonal in structure with a small amount of the monoclinic phase. The calculated energy release rate increased from ~50J/m -2 for as-sprayed TBCs to ~120J/m -2 for the TBCs exposed at 1150°C for 200h with a loading phase angle about 42°. This may be attributed to the sintering of the TBC. X-ray micro-tomography was used to track in 3D the evolution of the TBC microstructure non-destructively at a single location as a function of thermal exposure time. This revealed how various types of imperfections develop near the interface after exposure. The 3D interface was reconstructed and showed no significant change in the interfacial roughness after thermal exposure. © 2012 Elsevier B.V.

  • 268.
    ZhongYang, Gong
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Bottleneck detection through simulation software2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Bottleneck detection in production is essential to improve the overall manufacturing capacity. The common bottleneck detection methods have drawbacks of either practicability or accuracy. There is a recent manual methodology called bottleneck walk which is simple, accurate and easy to implement. Though it is a reliable and practical manual method, other more automated non-manual methods for detecting bottlenecks should be considered in the future. In this paper, the simulation models were built in a discrete event simulation software named Plant simulation. The models are based on real production cases where the bottleneck walk methodology had been tested. In the first case, the particular result shows that machine 2 has been the bottleneck for a long period, which is what is found in the real production. In the second case, the bottlenecks are found and the potential improvements are made on it. Though two improvement plans are made, neither of them solves the bottleneck and im-proves the system output. The plan of reducing buffer size might probably have an improve-ment on financial aspect. And further improvements on all findings remain available on models built in this paper.

  • 269.
    Åstrand, Erik
    University West, Department of Engineering Science, Research Environment Production Technology West.
    Key Changes in the Welding of Fatigue Loaded Structures2014In: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, p. 1-7Conference paper (Refereed)
    Abstract [en]

    This paper discusses welding problems of today and the possibilities for tomorrow for companies in the welding industry. By leaving old welding procedures based on traditions and applying new scientifically developed welding demands and procedures there is a vast potential to improve strength performance of the structures and increased competitiveness regarding weld work for the companies. Unfortunately, no changes are done easily and quickly and this paper gives proposals how changes can be done efficiently.

  • 270.
    Öberg, Anna Ericson
    et al.
    Volvo Construction Equipment, Arvika, Sweden.
    Sikström, Fredrik
    University West, Department of Engineering Science, Division of Production Systems.
    Barriers for industrial implementation of in-process monitoring of weld penetration for quality control2017In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 91, no 5-8, p. 2427-2434Article in journal (Refereed)
    Abstract [en]

    The research conducted sheds a light on the question why robust in-process monitoring and adaptive control are not fully implemented in the welding industry. In the research project FaRoMonitA, the possibilities to monitor the weld quality during welding have been investigated. Research conducted in this area has merely focused on technical issues investigated in a laboratory environment. To advance the research front and release some barriers related to industrial acceptance, the studies conducted in this paper have been both quantitative and qualitative in form of experiments combined with an interview study. The quality property weld penetration depth was chosen for in-process monitoring to evaluate the industrial relevance and applicability. A guaranteed weld penetration depth is critical for companies producing parts influenced by fatigue. The parts studied were fillet welds produced by gas metal arc welding. The experiments show that there is a relationship between final penetration depth and monitored arc voltage signals and images captured by CMOS vision and infrared cameras during welding. There are still technical issues to be solved to reach a robust solution. The interview study indicates that soft issues, like competence and financial aspects, are just as critical.

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