Search for dissertations about: "welding thesis"

Showing result 1 - 5 of 274 swedish dissertations containing the words welding thesis.

  2. 1. Conduction laser welding : modelling of melt pool with free surface deformation

    Author : Josefine Svenungsson; Högskolan Väst; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Conduction laser welding; numerical modelling; Computational Fluid Dynamics; OpenFOAM; free surface deformation; melt pool; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Laser welding is commonly used in the automotive-, steel- and aerospace industry. It is a highly non-linear and coupled process where the weld geometry is strongly affected by the flow pattern in the melt pool. Experimental observations are challenging since the melt pool and melt flow below the surface are not yet accessible during welding. READ MORE

  4. 2. Laser welding : energy redistribution and weld geometry

    Author : Conny Lampa; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material Mechanics; Materialmekanik;

    Abstract : Over the past few years laser welding has developed into a process which has a wide range of application over a number of industries. Industrial growth in this area has been stimulated by improvements in production rates and quality but technologically the process is still not fully understood. READ MORE

  5. 3. A Framework for optimised welding of fatigue loaded structures : Applied to gas metal arc welding of fillet welds

    Author : Erik Åstrand; Gunnar Bolmsjö; Fredrik Sikström; Heikki Remes; Högskolan Väst; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GMAW; Fatigue; Welding procedures; Fillet welds; Weld quality; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Welding is a key process for heavy steel structures, but it is also a weak link in the structure since fatigue fractures in welds are a common cause of failure. This thesis proposes several changes in order to improve the fatigue properties in acost effective way, enabling reduced weight and reduced cost of welded structures. READ MORE

  6. 4. Challenges in Resistance Welding of Ultra High Strength Steels

    Author : Erik Tolf; Arne Melander; Zuheir Barsoum; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Resistance welding; spot welding; surface cracks; nut welding; UHSS; projection welding; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : Increasing the use of Ultra High Strength Steels (UHSS) in vehicle bodystructures is important for reducing weight and cutting CO2 emissions. This thesis investigates challenges in resistance welding that can be a barrier to implementing UHSS as a replacement for low strength steels in vehicle structures. READ MORE

  7. 5. Process chain simulation of forming, welding and heat treatment of Alloy 718

    Author : Joachim Steffenburg-Nordenström; Lars-Erik Svensson; Lars-Erik Lindgren; Fredrik Niklasson; Högskolan Väst; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forming; Welding; Stress relieve annealing; Heat treatment; Finite Element Simulation; Manufacturing process chain; Alloy 718; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Manufacturing of aero engine components requires attention to residual stress and final shape of the product in order to meet high quality product standards.This sets very high demands on involved manufacturing steps to meet design requirements. READ MORE