Abstract
A series of impact tensile tests of spot welded joints made on interstitialfree steel sheets have been carried out using a fabricated fixture. Spot weldedsamples were made from as received as well as prestrained steel sheets withthe aim of examining the effect of prestrain on the impact tensile toughnessof spot welds. The impact tensile toughness values of spot welds were foundto be higher than their corresponding quasi-static toughness determined usingtensile shear specimens. While the quasi-static toughness of spot welds decreaseswith increasing prestrain, the impact tensile toughness exhibits an oppositetrend with prestrain within the range of investigation. The observed resultshave been discussed with considerations of specimen configurations, test procedure,microstructure, substructure, hardness profiles along the welds and post-failureexaminations.
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