Effect of strength of steel sheets on tensile shear strength and failure mode of dissimilar joint of spot welds

Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and improvement of crash performance. In general, weldability formability tends to decline as increases. Hot stamping a technique that achieves both sheet, TS1500MPa class hot stamped applied many vehicle models. On other hand, since joint characteristics spot weld are dominated by melt-solidified zone heat affected zone, there concern performance welded joints will words, order further expand application AHSS, it very important have knowledge about joints. this report, we investigated TSS focusing on tensile shear Then, compared failure position same kind material dissimilar with case plug failure. As result, was found depend base metal lower side. However, fracture occurred side except large difference strength. The mechanism thought effect strain concentration at edge nugget due increase rotational deformation around nugget.