GS0114-346 超音波振動を利用した溶接残留応力の低滅 : SUS304薄板溶接に対する加速度振幅の影響

Abstract

In welding, material is heating locally. Therefore, it generates tensile residual stress in the heat affected zone and changes the quality of material. Those will be causes problem of stress corrosion cracking in SUS304. One of the conventional prevention is to use material that hardly occur heat sensitization, but stress corrosion cracking is observed in that material. Therefore, it is desired to reduce or remove the tensile residual stress generated by welding. Accordingly, we have been proposed a method that adds ultrasonic vibration during welding. The method can reduce the tensile residual stress easily in a shorter time than conventional methods. Experimentally, it has ever been shown that this method can reduce the tensile residual stress on heated zone for thin plate of SUS304. In this study, it is examined that acceleration amplitude influences to reduction of the tensile residual stress for welding of thin plate of SUS304.