Abstract
Resistance spot welding is commonly employed methodology to join metals especially in the automobiles. A typical body in white structure of a car consists of 5000–7000 spot-welds. During service period of a car, the failure of joints under static and fatigue loads is of serious concern. The objective of present study is to examine the failure behaviour of resistance spot-weldments on different varieties of automotive steels. The failure of the spot-welds is a driven phenomenon. In current study attempts have been made to investigate different modes of failure of spot-welds under static as well as cyclic loads. Besides, microstructural development and microhardness distribution in the joints have been studied. The major findings from this work are: the joints under fatigue loading tends to fail primarily from heat-affected zone (HAZ) while on the other hand, joint failure subjected to static loading takes place at base metal (BM) or interfacial region of HAZ as well as BM. The joint failure subjected to static load is controlled by tensile strength of the as-received steel, however the joint failure subjected to fatigue load is dictated by inherent stress concentration present in interfacial region of the joints.
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