残余应力对产品的质量和使用寿命危害很大,目前降低和消除残余应力的办法很多,如热处理法、振动法、爆炸法、机械拉伸法等。对大型焊接结构,如大型压力容器、大型机床床身和工作台,目前不得不采用焊后热处理。由于焊接结构庞大,整体 Residual stress on the quality of the product and life-threatening, the current reduction and elimination of residual stress many ways, such as heat treatment, vibration method, explosion method, mechanical stretching method. Large welded structures, such as large pressure vessels, large machine tool beds and work platforms, currently have to use postweld heat treatment. Due to the huge welding structure, the whole