Abstract
A series of impact tensile tests of spot welded joints made on interstitial free steel sheets have been carried out using a fabricated fixture. Spot welded samples were made from as received as well as prestrained steel sheets with the aim of examining the effect of prestrain on the impact tensile toughness of spot welds. The impact tensile toughness values of spot welds were found to be higher than their corresponding quasi-static toughness determined using tensile shear specimens. While the quasi-static toughness of spot welds decreases with increasing prestrain, the impact tensile toughness exhibits an opposite trend with prestrain within the range of investigation. The observed results have been discussed with considerations of specimen configurations, test procedure, microstructure, substructure, hardness profiles along the welds and post-failure examinations.
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