Search for dissertations about: "Welding"

Showing result 1 - 5 of 255 swedish dissertations containing the word Welding.

  1. 1. Challenges in Resistance Welding of Ultra High Strength Steels

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

    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

  2. 2. Laser welding energy redistribution and weld geometry

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Conny Lampa; [1997]
    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

  3. 3. Conduction laser welding modelling of melt pool with free surface deformation

    University dissertation from Trollhättan : University West

    Author : Josefine Svenungsson; [2019]
    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. 4. Modelling of Electric Arc Welding arc-electrode coupling

    University dissertation from Gothenburg : Chalmers University of Technology

    Author : Alireza Javidi Shirvan; Isabelle Choquet; Håkan Nilsson; Alexei Heintz; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electric welding; arc welding simulation; electrode; plasma; cathode layer; sheath; arc discharge; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Arc welding still requires deeper process understanding and more accurateprediction of the heat transferred to the base metal. This can be provided by CFD modelling.Most works done to model arc discharge using CFD consider the arc corealone. READ MORE

  5. 5. Modeling and Simulation for Welding Automation

    University dissertation from Gothenburg : Chalmers University of Technology

    Author : Fredrik Sikström; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Welding automation; Heat conduction; Model order reduction; Finite element modeling; Controller design; Welding simulation; Sensors; Fixturing;

    Abstract : Fusion welding of metals is an important manufacturing process. This thesis presents a modeling and simulation strategy for welding automation. It deals with the problem of mitigating discontinuities caused by this process, and focus is on a high joint performance and structural integrity. READ MORE