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  • The productive welding of pressure vessels
    Krepek, Roman ; Rak, Inoslav
    The influence of productivity level of two different welding processes (self shielded FCAW and SAW) on properties of weld joints such as fracture toughness, charpy impact toughness, hardness and ... tensile strength is discussed. These applied welding processes are used in the manufacture of the pressure ferrite - bainite steel 13MnNi6.3 vessels and other sophisticated equipment on site and in workshops. For this purpose one butt joint was weldedin the flat position using the SAW "twin arc" procedures and two were welded in vertical positions (up and down) using the semi automatic FCAW procedures. The highest productivity (deposition rate) was achieved in the flat position using SAW "twin arc" procedure. There were no essential differences in productivity between the FCAW welding procedures in vertical up and down positions. Correctly determined welding technology in the twin wire SAW and FCAW procedures, and well trained and educated welders for the FCAW procedures, could increase the welding productivity in comparison to more conventional welding procedures especially with respect to the capability of used procedures such as SMAW and SAW. At the same time the required mechanical properties of the produced equipment (Charpy impact energy, fracture toughness, strength and hardness) could be assured. The most important factors in the proper selection of the productive welding procedures demands a good knowledge of the correlation between welding parameters, thermal cycle, chemical composition of basic and filler materials, mechanical and fracture mechanical properties, and the microstructure and content of oxygen in the weld metal.
    Vir: Strojniški vestnik. Posebna izdaja = Journal of mechanical engineering. Special edition. - ISSN 1580-1330 (1999, str. 510-517)
    Vrsta gradiva - prispevek na konferenci
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 4848918

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