Abstract
In this era of light-weighting of vehicles, Advanced High Strength Materials (AHSS) proved themselves very promising, as they are well known for their crashworthiness properties along with higher strength. The high strain rate properties of the AHSS materials have been already found out by researchers. The mostly employed AHSS materials at crash sensitive areas are found to be under Dual Phase (DP) group, DP 800 and DP 1000 steels. However, in application many materials are joined together with similar or dissimilar material, mostly by spot welding and there is not much literature available on behavior of welded AHSS material at crash situation. This study focus on understanding of strain rate sensitivity of DP800-DP1000 material’s resistance spot welded joints at high strain rates. For this, the materials are welded by spot welding at optimized parameters. After high strain testing of the welded samples, it was found that the welded joints show less strength than homogeneous materials but they do show strain rate sensitivity.