Verification of spot weldability of newly developed hot-dipped galvanized (Gl) and galvannealed (GA) coated steel sheets from HSLA, IF Ti and Ti+Nb stabilized and Mn-Cr-Mo ferrite-martensite dual-phase steels was performed. Resistance spot welding of steels was carried out using pneumatic resistance spot welding machines BPK 20 and Taylor Winfield 50. The qualities of the welded joints sheets of thickness from 0.8 mm to 1.5 mm were inspected using the peel test, static shear-tension and cross-tension test, micro-hardness testing and metallographic analysis. Tensile testing showed that in the case of 1.5 mm high strength dual-phase steel, interfacial fractures of welds occurred, but the average load-bearing values of welds were still high. It can also be stated that the welding parameters were suitable for developing high quality welds. This fact was confirmed by metallographic analysis and also verified by analysis of cracked joints after the tensile testing, that sufficient fusion occurred using the recommended welding parameters. Clinching parameters optimization was made for joining of 1.2 mm sheets from galvannealed dual-phase steel and joining of 0.8 mm sheets from IF Ti+Nb stabilized steel. Tensile peeling test, static shear-tension test and metallographic analysis were used for the spot welding and clinching quality analysis.


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    Title :

    Optimization of resistance spot welding and clinching parameters for coated automotive sheet steels


    Contributors:
    Gatial, Martin (author) / Matta, Milan (author) / Kascak, Lubos (author) / Vinas, Jan (author)


    Publication date :

    2010


    Size :

    12 Seiten, 25 Bilder, 61 Tabellen, 5 Quellen


    Remarks:

    (nicht paginiert)


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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