The residual stress in the spiral submerged arc welding (SSAW) pipe of 660mm OD and 7 1mm wall thickness is tested by the stress releasing method.

• 对外径 660mm、壁厚 7 1mm国产内胀成形X60钢级螺旋缝埋弧焊管的未水压、水压后和稳压后 3种管段样品 ,用机械切割应力释放法进行了内外表面残余应力的测试。