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  • 1.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering.
    Pejryd, Lars
    3Production Technology Centre, Innovatum AB.
    A survey of metal working companies’ readiness for process planning performance measurements2009In: IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 8-11 sep, 2009, Hong-Kong, 2009, p. 1910-1914Conference paper (Refereed)
    Abstract [en]

    The paper presents an investigation regarding the potential and the readiness for implementing performance indicators and performance measurement systems of the process planning work for metal working companies. The paper is based on a questionnaire survey distributed to process planners in the Swedish metal working industry. The main outcome of the investigation is a foundation for understanding the implementation of performance measures of the process planning work for CNC machining. The survey revealed a few strengths and short comings in the studied companies.

  • 2.
    Basaran, Hüsnücan
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    El Labaki, Jonathan
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Byggprojektledning: att strukturera upp projektledares tillvägagångssätt2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor's thesis of 15 credits was carried out in Vara municipality after the property manager stated a need. The task was to standardize the project managers' approach in terms of management and structure, and to improve the possibility of new recruitments and takeovers of existing projects. With the help of interviews, it was identified that the project managers worked in different ways without tools to support structuring and managing their projects.

    In order to be able to answer how the problem image could be sorted out, the writers designed a content for a manual that the project managers could use. By following the contents of the manual, the project managers are expected to be able to more easily manage and structure their projects. As a result of a standardized work method, new recruitments and takeover of projects are also expected to be simplified.

    The introductory chapter of the bachelor's thesis describes how the background to the work looked, as well as the purpose, goal and delimitation.

    The second chapter describes the writers' method for designing the work that followed a scientific starting point.

    The third chapter consists of the writers' theory sections that were needed to create an understanding of how the actual construction process and the project management process could look. This chapter was used as a knowledge base to be able to make decisions about the contents of the manual.

    With the help of interviews and meetings at the municipality, a current situation analysis was formed, which is presented in chapter four. The current situation analysis was used as a basis for designing the contents of the manual.

    In the fifth chapter, the contents of the manual are described using a presented result as well as discussion and analysis of why the content was necessary for the project managers to follow.

    Finally, in the sixth chapter, a conclusion is drawn about how the purpose of the degree project should be fulfilled and a future recommendation for continued work in the subject area.

  • 3.
    Ekström, Johanna
    et al.
    University West, Department of Engineering Science.
    Emanuelsson, Stefan
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Förstudie till implementering av papperslös verkstad2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Under sommaren 2012 genomfördes ett examensarbete på Siemens Industrial Turbo­mach­inery AB i Trollhättan gällande möjligheterna att införa pappers­lös verkstad. Syftet med examensarbetet var att kartlägga möjligheterna att minska administrativ hant­ering av produktions­orderkort och öka realtidsuppdatering. För att av­gränsa studien avsåg examens­arbetet endast flödet av produk­tions­­­order­kort ifrån plan­er­ings­avdelningen genom två pro­duk­tions­grupper och vidare in på gods­­­­avdel­ningen.

    För att kartlägga flödet för den manuella hanteringen av produktionsorderkort upprättades värdeflödesanalyser. Dessutom genomfördes ett studiebesök på Volvo Aero Corporation för att se hur ett annat företag har gjort för att eliminera elektronisk produk­tionsorder. Utifrån värdeflödesanalyserna och studiebesöket identifierades tre frågeställ­ningar vilka an­sågs vara betydelsefulla för att kunna införa elektronisk produk­tions­order. Dessa var huru­vida affärssystemet klarar av att hantera införande av elektronisk produk­tions­order, hur spårbarheten av material skall bibehållas samt hur godsavdelningen skall få information om var detaljer skall förflyttas. För att besvara dessa frågor genomfördes 15 inter­vjuer med per­sonal från Siemens Industrial Turbo­machinery i Trollhättan, med per­sonal från huvud­kontoret i Finspång samt med personal från systemutvecklingsföretaget Else AB.

    Informationen från alla intervjuer samt studiebesöket på Volvo Aero Corporation belyser möjligheterna och problemen med att eliminera produktionsorderkorten och samman­ställ­des i en utvärdering. Denna utvärdering ligger till grund för kartläggningen av det fram­tida tillståndet, vilken visar ett tänkbart arbetssätt när produktions­order­korten tagits bort och ersatts med elek­tronisk produktions­order. Det som huvud­sakligen belyses i det framtida tillståndet är att affärssystemet är förberett för elek­tronisk produk­tions­order, dock rekom­men­deras införande av Warehouse Management System samt ett transportssystem. För att under­­lätta implementering av elektronisk produktionsorder skulle införande av ett web­baserat användargränssnitt vara lämpligt.

  • 4.
    Eriksson, Kristina M.
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Mileham, A.R.
    Newnes, L.B
    A scheduling performance comparison tool – scheduling performance profile (SPP) graph2006In: Proceedings of IDMME06, International conference on integrated Design and Manufacturing in Mechanical Engineering: Grenoble, France. May 17-19, 2006Conference paper (Other academic)
  • 5.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Frequency Domain Study of Vibrations above and under Stability Lobes in Machining Systems2014In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 14, p. 164-169Article in journal (Refereed)
    Abstract [en]

    Using modified Nyquist contours, the dominant poles of the closed loop delay-differential equation for machining systems such as milling are identified. Contours with constant damping ratio of the dominant poles are constructed using this method. These contours are similar in shape to the stability lobes, but move upwards and to the right as the instability parameter increases. Additionally, it is possible to study the movement of the dominant poles to the right-hand side of the complex plane as the system becomes unstable by increasing the depth of cut at a constant spindle speed. The movement of the dominant pole is shown to be towards the right (unstable) and upward (higher vibration frequency) of the complex plane. In some cases, there would be a jump of vibration frequency due to the change of the lobe number. It is also shown that the damping ratio of the structure strongly affects both the vibration frequency and the damping ratio of the dominant poles in the closed loop system. Finally, in two milling experiments with two different spindle speeds and continuously increasing depth of cuts, vibration frequencies are measured and compared to the theoretical predictions. The measurements agree with the theoretical predictions, particularly in the unstable cutting conditions.

  • 6.
    Gråsjö, Urban
    University West, Department of Economics and IT, Division of Law, Politics and Economics.
    Accessibility to R&D and Patent Production2005Report (Other academic)
    Abstract [en]

    The main purpose in this paper is to study to what extent accessibility to R&D can explain patent production. Therefore a knowledge production function is estimated both on aggregated level and for different industrial sectors. The output of the knowledge production is the number patent applications in Swedish municipalities from 1994 to 1999. In order to account for the importance of proximity, the explanatory variables are expressed as accessibilities to university and company R&D. The total accessibility is then decomposed into local, intra-regional and inter-regional accessibility to R&D. As often is the case with R&D outputs, the regional distribution of patents is highly skewed with influential outliers. The estimations are therefore conducted with quantile regressions. The main results on aggregated level indicate that high accessibility (local) to company R&D has the greatest positive effects on patent production. The effects are statistically significant for municipalities with a patent production corresponding to the median and to quantiles above the median. Local accessibility to university R&D is only of importance for certain industrial sectors and not on aggregated level. There is also evidence that intra-regional accessibility to company R&D affects patent production positively. A conclusion is that concentrated R&D investments in companies situated in municipalities with a high patenting activity would not only gain the municipalities themselves, but also the patent production in other municipalities in the functional region.

  • 7.
    Hall, Maria
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Henriksen, Sara
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Identifiering av mätetal för att öka effektiviteten inom inköp2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is performed at GKN Aerospace Sweden AB (GAS) in Trollhättan with purpose to map the purchasing process and find indicators to make the process more efficient. The target is that by the end of March 2016 to be able to determine if the efficiency of the purchasing process can be measured. The thesis has been limited to find metrics for the purchase of production materials and delimited to map the purchasing process from "purchase requisition" to stock. The thesis is a qualitative study and has been carried out through interviews, observations, benchmarking, concept screening and mapping in terms of a BPI-workshop. During the BPI-workshop a number of roles in the process participated to map the "current state", which contained 38 wastes. Based on the "current state" 15 improvement proposals was generated which GAS should implement to achieve "future state". If the proposed improvements are introduced the lead time for the process is expected to reduce from 96 to 42 days.Of the three companies that were visited during the study none of them had metrics for how efficient their process is. The companies including GAS only had measures for how well the suppliers are performing and other measurements for the internal process. The conclusion is that it is difficult to find a single metric that can represent the efficiency of the entire purchasing process, because of its complexity that is influenced by many factors. The only metrics the students suggests GAS to measure for the defined process is: Number of incorrect purchase requisitions The metric does not measure how efficient the process is, the metric will only measure how often errors occur which creates an inefficient process. In order for the metric to be relevant GAS need to implement the proposed improvements that were generated during the BPI workshop.The metric should be measured before and after the implementation of the improvement proposals to achieve the desired effect. Besides this metric, the students suggest GAS to measure the following metrics to eventually get an efficient process: Continuous improvement purchase Finally GAS is urged to continue to implement BPI-workshops for other parts of the purchasing process to identify wastes that are not discussed in this thesis.

  • 8.
    Hansson, Jonas
    University West, Department of Engineering Science.
    Integrated Management Systems – advantages, problems and possibilities2010In: 13thToulon-Verona international quality conference. 2-4 sept, 2010: Organizational Excellence in Service, 2010Conference paper (Refereed)
    Abstract [en]

     Effective management in the globalized world requires an effective, efficient and flexible management system. Effective could be interpreted as addressing all relevant stakeholder concerns in a context of Corporate Social Responsibility (CSR). Efficient would mean that it does the job with low resource use. Flexibility requires that changed conditions and new requirements easily can be included. Many organizations are already working with Integrated Management Systems (IMS). Interesting questions are to what extent current integration covers the above mentioned needs and if not what changes are needed. This conceptual paper looks at the advantages and problems of integration. Possibilities for development of fully integrated management systems are studied from the perspective of managing stakeholder needs, with the forthcoming ISO 26000 – “Guidance on social responsibility”, as inspiration. Results show that there are advantages in integration, but that the scope and level of integration often is limited. A conceptual model for integrating all stakeholder needs in value networks is presented.

  • 9.
    Hatefipour, Saeid
    et al.
    University West, Department of Engineering Science, Division of Automation Systems. saeid@termisk.se.
    Ahlberg, Jörgen
    Linköping University.
    Wren, Joakim
    University West, Department of Engineering Science, Division of Automation Systems.
    Runnemalm, Anna
    University West, Department of Engineering Science, Division of Automation Systems.
    Thermal non-destructive testing: modeling, simulation and experiments for improved localization of hidden defects2014In: The 12th International Conference on Quantitative Infrared Thermography, 2014, p. 1-8Conference paper (Refereed)
    Abstract [en]

    During the last decades, a substantial amount of research and practical work has been conducted on non-destructive testing of materials using thermography. The performed studies elucidate the potential of various types of thermal non-destructive testing (TNDT) for different materials and applications, including various types of defects. This paper presents a method for detecting in-depth defects in metallic materials and a simulation model for the heat transfer in the material. Experiments are performed on a test specimen with artificial defects (flat-bottom holes). The detection method exploits spatiotemporal analysis in order to find deviations from a model of normality, and shows novel results. Thermal modelling is performed in order to have a base-line simulation model enable us to (a) investigate affecting parameters without repeating the experiments and (b) generalize the results and extend their validity to other cases. Results show that there is an acceptable compliance between simulated and measured thermal data. 

  • 10.
    Karlsson, Robin
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Projekteringsunderlag för hydraulisk rörspräckning och granskning av utfört projekt2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har utförts på uppdrag av Trollhättan Energi AB, som önskat erhålla ett projekteringsunderlag för ett kommande förnyelseprojekt samt ett granskningsunderlag av ett nyligen utfört arbete. Syftet med rapporten är att förbättra den interna kunskapsnivån angående beräkningsmetodiken för om hydraulisk rörspräckning är en möjlig metod, tänkbara rörmaterial vid metoden och om dimensioneringsmetodiken för rör som föreligger, för att motverka komplikationer i framtida projekt.Rapporten innehåller en ekonomisk kalkyl om huruvida schaktfri ledningsförnyelse är fördelaktigt kontra schaktning, utifrån de projekt Trollhättan Energi AB utfört mellan åren 2009-2015. Därefter följer en redogörelse för om hydraulisk rörspräckning är en möjlig metod vid ett kommande förnyelseprojekt i Sjuntorp, där beräkningsmetodiken för om metoden är möjlig behandlas. Vidare följer en kartläggning av tänkbara rörmaterial vid hydraulisk rörspräckning, som identifierats via en litteraturstudie och ett flertal intervjuer med personer inom branschen. Därpå behandlas dimensioneringsmetodiken för ett rör i samband med en uträkning för projektet i Sjuntorp. Slutligen följer en sammanställning av en enkätundersökning angående hydraulisk rörspräckning som genomförts i projektet och en granskning av ett nyligen utfört rörspräckningsprojekt på Stallbacka industriområde.I slutsatsen konstateras att schaktfri ledningsförnyelseteknik är att föredra, varpå hydraulisk rörspräckning bör utföras där möjlighet föreligger. Det belyses även att hydraulisk rörspräckning är en möjlig förnyelsemetod för det kommande projektet i Sjuntorp utifrån rådande förutsättningar, men att en geoteknisk undersökning krävs för att ytterligare säkerställa det här. Vidare betonas att polyeten, PE100, med en skyddskappa av polypropen är ett lämpligt rörmaterial, men att spaltens storlek har stor inverkan på huruvida dimensionerande värden överskrids för SDR-klass 17, varpå segjärn kan vara ett alternativ beroende på kostnadsskillnaden gentemot en högre SDR-klass. Samtidigt är det möjligt att rör av polypropen med en hög elasticitetsmodul kan komma att användas i allt större utsträckning i framtiden. Slutsatsen av enkätundersökningen är att polyeten är ett vanligt rörmaterial vid hydraulisk rörspräckning och att en noggrann undersökning av de förutsättningar som föreligger är viktigt att beakta. Till sist konstateras utifrån granskningen av projektet på Stallbacka och i likhet med enkätundersökningen, att en utredning av rådande markförhållanden är central. Dessutom kan det fastställas att beräkningen för om hydraulisk rörspräckning är en möjlig metod, var bristfällig, samt att segjärn eventuellt borde använts som rörmaterial motiverat av högre diffusionstäthet.

  • 11.
    Lagrosen, Yvonne
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Bäckström, Ingela
    Developing a measurement system for health-related quality management2007In: 10th QMOD Conference.: Quality Management and Organiqatinal Development. Our Dreams of Excellence, 18-20 June, 2007 in Helsingborg, Sweden, Linköping University Electronic Press , 2007, p. issue 26:12-Conference paper (Other academic)
  • 12.
    Li, Peigang
    et al.
    ESAB AB, Gothenburg, Sweden.
    Hurtig, Kjell
    University West, Department of Engineering Science, Division of Welding Technology.
    Högström, Mats
    University West, Department of Engineering Science, Division of Welding Technology.
    Svensson, Lars-Erik
    University West, Department of Engineering Science, Division of Welding Technology.
    Scotti, Americo
    University West, Department of Engineering Science, Division of Welding Technology.
    A contribution to the study of negative polarity in GMA welding2018In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 95, no 5-8, p. 2543-2553Article in journal (Refereed)
    Abstract [en]

    GMAW using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The objective of this work was to further study the performance of negative polarity in GMAW of carbon steels. In this project phase, bead-on-plate welds were carried out in flat position to assess the effect of different potential shielding gas compositions on bead geometry, finishing and spattering. The characteristics were compared with DCEP at the same current, but depositing the same volume of material per unit of length (more industrial related comparison). The arc length was kept the same by adjusting voltage to reach shortest arcs, yet with suitable non short-circuiting metal transfer mode. An approach to measure bead convexity was also proposed and assessed. The results showed that DCEN is feasible as a means of increasing GMAW production capacity. However, to become DCEN applicable with GMAW, the results suggest an Ar based blend with around 6.5 % of O2 is the most appropriate shielding gas, as much as that there is a demand for a standard electronic controlled power source able to work in constant current mode. 

  • 13.
    Lützhöft, Margareta
    et al.
    Chalmers.
    Ljung, Margareta
    University West, Department of Social and Behavioural Studies, Division of Social Pedagogy and Sociology.
    Nodin, Karin
    University West.
    Funktionsbaserad bemanning : En förstudie 2008Report (Other academic)
  • 14.
    Mehmood, Faisal
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Laser Welding of Aluminium in Automotive Industry2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With all the advantages aluminium (Al) carries being the light weight and sustainable material, the laser welding of Al is tricky and complicated. The major challenges in laser welding of Al are the hot cracking, porosity and reflectivity. The experiments are done in order to understand the laser welding of Al process and analyse the process parameters impacts. In this thesis work, laser welding of Aluminium alloy is done in order to understand the process parameters effects on the weld quality. Experiments are done on the 5754-H22 and 6082-T6 alloys. Welding speed and laser power is kept constant for the experiments, however, laser focus position is varied on the plates. Focus position is kept on the surface of the plate as well as above and below the surface. The butt welding of same material alloy is done on the 3 mm plates. It is been analyzed that Al alloy 6082-T6 is easier to weld and give better weld quality as compared to 5754-H22. The overlap weld is done on 1.5 mm thick plates with CW (continuous wave) welding and PW (pulse weld). The laser welding is done with high speed, therefore, CW welding shows quality weld with no significant undercut or concavity as compared to PW welding method. The focus position above the surface shows quality weld in overlap weld with both PW and CW welding methods.

  • 15.
    Nilsson, Patric
    et al.
    Volvo Aero.
    Appelgren, Anders
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Henrikson, Per
    Volvo Aero.
    Runnemalm, Anna
    University West, Department of Engineering Science, Division of Process and Product Development.
    Automatic Ultrasonic testing for Metal Deposition2012In: Proceedings 18th World Conference on Non-Destructive Testing: 16 - 20 April 2012, Durban, South Africa, Durban, 2012, p. 1-10Conference paper (Refereed)
    Abstract [en]

    Metal Deposition (MD) is a method to build three dimensional metal geometries by welding using filler wire or powdered metal. NDT of a MD feature is required when the feature is located in an area of high stress or could be a potential hazard to the part. Ultrasonic testing (UT) can be used to detect pores, linear indications and lack of fusion in welds. This method has limitations when it comes to large parts with complex geometries with various shapes and sizes. A flexible method for inspecting complex geometries is to mount an ultrasonic water flow probe (squirter) on a robot. The robot can then follow a pre-programmed path to achieve full inspection of the feature. This paper shows results and functionality from a system where a squirter probe was used together with a standard industrial robot. Results from a scanning of a three-dimensional MD-structure are also presented.

  • 16.
    Persson, Tore
    et al.
    University West, Department of Technology.
    Ottermark, Kenth
    En kritisk analys av företagsnätverk2005Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Vi har studerat samarbetet i olika företagsgrupperingar inom Västra Götalands län. I studien har vi jämfört de aktuella grupperingarna med bl.a. beskrivningar av grupperingar i industriella distrikt i norra och mellersta Italien. Dessutom har jämförelser gjorts med det nätverkssamhälle, som Castells har beskrivit, samt det samhälle – det gamla agrarsamhället - som Tönnies och Colley studerat m. a. p. sociala relationer. *För det första har vi funnit att det tar lång tid, 5 – 10 år, att skapa ett fungerande nätverk. Alla grupperingar blir inte framgångsrika nätverk. De flesta grupperingar tycks faktiskt aldrig nå fram till ett fungerande nätverk och det är kanske inte heller alltid syftet. Så t.ex.var syftet i de LRF-grupperingar vi studerat främst att få stöd till utbildningsinsatser och för det var man i stort sett tvingad att bilda ett nätverk. Vi tycker oss se att det finns skillnader i arbetssätt mellan grupperingar, som har samarbetat inbördes under en längre tid (ca 5 år) och de som är relativt nystartade (1-2 år). Även attityderna tycks vara annorlunda. Eftersom det statistiska underlaget är begränsat kan vi inte uttala oss med säkerhet i dessa frågor. Vi har dock noterat att man i de studerade grupperingarna i allmänhet ägnar för kort tid åt att bygga nätverket. De tror att grupperingen skall fungera som ett bra verktyg utan närvaro av det sociala kapitalet. *Vi kan inte se tillstymmelse till det ”nätverkssamhälle”, som Castells har beskrivit. Möjligen finns det samhället representerat i vår region, men det har ännu inte kommit till de företag och de grupperingar som denna studie omfattar. Det är troligt att ”nätverkssamhället” finns mer påtagligt i företag, som ingår i globala koncerner. Däremot finns det tecken på att IT-kunnandet och användandet ökar starkt i företagen. *Inte heller passar Tönnies och Cooleys beskrivningar av samverkan och umgänge i agrarsamhället in på de företagsgrupperingar, som vi har studerat. Däremot kan vi se att deras beskrivningar delvis passar in på byalag och utvecklingsgrupper på landsbygden. Dessa grupperingar har ett högt värde på det sociala kapitalet och den sociala väven är relativt tät. Varje byalag är dock för litet för att kunna åstadkomma den utveckling som önskas. Med intensifierad samverkan mellan olika byalagsgrupperingarna inbördes och med andra grupperingar kan resultatet förväntas bli bättre. *När vi jämför de studerade grupperingarna med industriella distrikt ser vi att det sociala kapitalet hos dessa är mycket lägre än i de industriella distrikten. Det tar åtminstone 20-30 år att formas. Traditioner, normer och värderingar skall ha hunnit att bli en del av den lokala kulturen, dvs. de bör ha gått i arv mellan två generationer.

  • 17.
    Runnemalm, Anna
    University West, Department of Engineering Science, Division of Process and Product Development.
    Vibration Induced Disturbances in Automatic Non-destructive Testing2012In: Proceedings 18th World Conference on Non-Destructive Testing 16 - 20 April 2012, Durban, South Africa, Durban, 2012, p. 1-6Conference paper (Refereed)
    Abstract [en]

    The interest in automatic inspection of welds has increased during the last decade. An automatic inspection cell is self-acting both by scanning the inspected test piece and by evaluation of the resulting images. For automatic evaluation, high quality of the resulting images is essential. The non-smooth movement of the NDT-sensor when mounted on a robot-arm will have influence on the results. This paper focus on evaluation of the vibration induced disturbances due to the mounting of the sensor and the movement of the robot in an automatic cell. A thermography system detecting the geometry of welds is used in this study and both stationary and continuous movement of the IR camera are studied. The vibration due to the mounting on a robot arm are quantified and compared.

  • 18.
    Åstrand, Erik
    University West, Department of Engineering Science, Research Environment Production Technology West. University West, Department of Engineering Science, Research Enviroment Production Technology West. Volvo Construction Equipment, Carl Lihnells väg, Braås, Sweden .
    A new innovative toolbox for lean welding of fatigue loaded structures2015In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 81, no 1-4, p. 635-643Article in journal (Refereed)
    Abstract [en]

    Welding is a key manufacturing technology in the production of heavy steel structures, but it is likewise a weak link in the production chain since fatigue fractures in welds is a common cause of failures. This paper proposes several changes in the process to make the manufacturing more efficient and to improve the fatigue properties. The idea is to adopt the weld quality demands for the purpose of the weld and to connect them to the welding procedures. This approach ensures that the primary focus during welding is at the critical characteristics which add value to the welded structure through an enhanced fatigue life. These fatigue life-critical properties have been found to be related to the local weld geometry in the weld toe and at the weld root. Traditional demands related to the good workmanship of welding can often be neglected, due to its limited effect to the fatigue life. The research presented in this paper has contributed to the development of welding procedures for improved fatigue life properties at the critical points of the weld. Results indicate a considerable potential for enhanced fatigue life of fillet welds. The idea is to replace the standard fillet welds with a new toolbox containing three different welds: (i) welds with optimized penetration, (ii) welds with optimized weld toe, and (iii) welds with a low cost. Right usage of these weld types contributes to an efficient production that offer a long fatigue life. This paper describes a holistic view of the subject and highlights issues with the traditional way of working. The challenge and the novelty in the paper are the connection between the welding process, weld demands, and fatigue life properties. This connection is necessary for the development of welding procedures that can contribute to the fabrication of weight optimized welded structures with a predictable life. © 2015 Springer-Verlag London

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