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Influence of production-related gaps on strength properties and deformation behavior of spot welded TRIP Steel HCT690T

: Brauser, S.; Pepke, L.-A.; Weber, G.; Rethmeier, M.

Welding in the world 56 (2012), No.3-4, pp.115-125
ISSN: 0043-2288
Journal Article
Fraunhofer IPK ()
deformation; fatigue life; finite element analysis; GaP; resistance spot welding; shear strength

In this study, the influence of production-related gaps on the shear tension strength and fatigue performance was investigated for resistance spot welded TRIP steel HCT690. Furthermore, the local strain distribution in shear tension test was calculated by the digital image correlation technique (DIC). The static shear tension strength was found to be almost independent of gaps up to 3 mm. The maximum local strain in the spot weld region however decreases depending on which sample side (deformed or undeformed) is considered. In addition, it has been ascertained that gaps of 3 mm lead to a significant drop in fatigue life compared to gap-free shear tension samples. This fact could be attributed to decreased stiffness, higher transverse vibration and higher rotation (?) between the sheets as well as increased local stress calculated by 2 dimensional FE simulation.