Calculation of Residual Stress of Spiral Welded Pipe

The residual stress imposes considerable negative influence on quality of the spiral welded pipe. Based on relevant deduction, the mathematical relational expression between the spiral welded pipe residual stress and the cut opening amount is set up. It is concluded that it is practical for the pipe makers to control the said residual stress by means of controlling the cut opening amount. The paper is helpful to establishing company criteria governing spiral welded pipe residual stress.