継手部加工によるFe-Alレーザー溶接継手の疲労強度評価

抄録

Application of weld-joint to steel and aluminum plates is still limited due to uncertainty of the fatigue strength because of stress concentration at the edge and formation of intermetallic compounds along the interface. This study investigated the key factor that determines the fatigue strength of steel-aluminum brazing joint by considering the variation of strength along interface. The welded part of single lap joint was partially removed by a wire-cut electric discharge machine to investigate the influence of length and location of interface on fatigue strength. When the applied load was relatively low it was found that the numbers of cycles to failure were found to be similar, even though the lengths of interface were different due to partial removal. Therefore, we concluded that the number of cycles to failure was mainly consumed at the early stage.