It was shown that the cut opening space length varied with the severing location, and the normal hydrostatical test mainly brought about the redistribution and decrease of the residual stress.

• 结果表明:切口位置不同,切口张开间距不同;正常的水压试验有一定的降低残余应力的作用,但主要是引起了焊管内部残余应力的重新分布;