Sökning: "WELD"

Visar resultat 16 - 20 av 168 avhandlingar innehållade ordet WELD.

  1. 16. Microstructure and properties of welds in the lean duplex stainless steel LDX 2101

    Författare :Elin M. Westin; John Ågren; Hannu Hänninen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Duplex stainless steel; welding; HAZ; nitrogen; manganese; microstructure; austenite formation; phase balance; precipitates; element distribution; segregation; depletion; solidification; pitting corrosion resistance; solidification; element loss; evaporation; deposition; weld oxide; thermo-mechanical simulation; thermodynamic modelling; EPMA; XPS; post-weld cleaning; pickling; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

    Sammanfattning : Duplex stainless steels can be very attractive alternatives to austenitic grades due to their almost double strength at equal pitting corrosion resistance. When welding, the duplex alloys normally require addition of filler metal, while the commodity austenitic grades can often be welded autogenously. LÄS MER

  3. 17. Optimal Estimation of Grain Orientation in an Anisotropic Weld by Ultrasonic Techniques

    Författare :Qingwei Liu; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; anisotropic weld model; multi-objective genetic algorithm; nonlinear optimization; ultrasonic probe model; 2D ray tracing;

    Sammanfattning : Grain orientation in an anisotropic weld highly influences ultrasound paths and thus is a significant parameter when making simulations of ultrasonic testing of anisotropic welds. Though each weld is thought to be unique in its structure, the common procedure in modeling is to prescribe the grain orientation in a weld based on limited experience. LÄS MER

  4. 18. Fatigue strength of welds in 800 MPa yield strength steels : Effects of weld toe geometry and residual stress

    Författare :Ebrahim Harati; Lars-Erik Svensson; Leif Karlsson; Högskolan Väst; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fatigue strength; Residual stress; Welds; Weld toe geometry; High strength steel; Weld Impression Analysis; Laser Scanning Profiling; Structured Light Projection; Manufacturing and materials engineering; Produktions- och materialteknik;

    Sammanfattning : Nowadays there is a strong demand for lighter vehicles in order to increase the pay load. Through this the specific fuel consumption is decreased, the amount of greenhouse gases is lowered and the transport economy improved. One possibility to optimize the weight is to make the components from high strength steels and join them by welding. LÄS MER

  5. 19. Modeling and Simulation of Weld Hot Cracking

    Författare :Joar Draxler; Lars-Erik Lindgren; Jonas Edberg; Paul Åkerström; Jesper Hattel; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material Mechanics; Materialmekanik;

    Sammanfattning : Several alloy systems are susceptible to weld hot cracking. Weld hot cracking occurs by fracture of liquid films, normally grain boundary liquid films, at the late stage of the solidification of the weld. The cracks can be small and therefore difficult to detect by nondestructive test methods. LÄS MER

  7. 20. Quantitative Characterisation of packet Crystallography in high strength steel weld metals

    Författare :Jan Zachrisson; Lars-Erik Svensson; Leif Karlsson; Joacim Hagström; Högskolan Väst; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acicular ferrite; bainite; inclusions; EBSD; SEM; TEM; misorientation; high strength weld metals; microstructure; characterisation; Physics; Fysik;

    Sammanfattning : .... LÄS MER