In the construction of vehicles weight savings are realized by innovative lightweight construction. For the body manufacturing modern high-strength steel sheet materials are developed at present, which permit a reduction to the plate thickness. An important task is the prediction of the failure mode and depending on this the loadability and the deformability at high loading rates depending on material properties and welding parameters. To evaluate this behaviour the experience from high rate testing of sheet specimens was transferred to the testing of spot welded sheets of different strength. Especially at the time of failure very high strain rate occur near the spot. In order to ensure sufficient corrosion protection, the steel sheets are coated. These corrosion protection coats of the sheet metals make their processing more difficult during manufacture, in particular when welding. Depending on the construction, a passenger car body has between 2500 and 4000 resistance spot welds. In the field of research and development MPA Stuttgart uses numerical simulation methods for the optimization of joining processes or testing methods. The shear strength of spot welds (static and dynamic) rises with increasing material strength. In case of mixed joints the less firm material (DC06) for the attainable strength of the welded samples is relevant. Differences of the attainable strength of the regarded CP- and TRIP-steel result in the different hardening due to the chemical composition and in the effect of the geometrical notch in the areas of the spot weld.


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    Title :

    Lightweight construction material and joining aspects


    Additional title:

    Leichtbau unter werkstoff- und fügetechnischen Aspekten


    Contributors:
    Roos, E. (author) / Mayer, U. (author) / Greitmann, M.J. (author)


    Publication date :

    2007


    Size :

    17 Seiten, 20 Bilder, 3 Tabellen, 14 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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