Abstract
Welding defects are generally considered to be undesirable in resistance spot welding process because they suggest deterioration of weld quality. A systematic investigation was undertaken with regard to addressing the effects of the welding defects, which were expulsion, shrinkage void, and cracks, on the quality of the welding joints for dual-phase steel. Peak load, the maximum displacement, energy absorption, and failure modes of the welding joints in the tensile shear tests were utilized to characterize welds performances. On the other hand, the nugget diameter was measured to describe the physical spot weld attributes. The metallographic observations and Vickers microhardness tests of the welding joints with defects were also carried out to better comprehend the mechanism of the welding defect occurrence.
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