Abstract
In order to apply high-strength steel sheets to a car body, it is necessary to comprehend the joint strength by spot welding in advance. Since the joint strength is considered to depend on the residual stress during welding, this paper examined a simple method for predicting the residual stress. The distribution of residual stress and strain caused by local material heating and cooling due to spot welding was formulated in the framework of material mechanics based on simple assumptions. The measured residual stress around the nugget formed by spot welding corresponds well with the predicted stress by the proposed formula.
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