Liquid Metal Embrittlement in Resistance Spot Welding (Third Report)

Abstract

This paper describes a mathematical model that considers the effects of thermal stress and strain caused by thermal expansion and contraction during cooling and the effect of bending by welding electrodes. As a result of predicting the effect of the initial gap between the steel plate and the welding electrode, the so-called clearance, using the model, when the clearance is large, the strain generated at the time of springback is reduced, and it is shown that liquid metal embrittlement cracking is unlikely to occur. This prediction corresponded well with the experimental results. Various effects other than clearance were predicted by the model.