本方法描述了用于确定焊缝或螺旋、连续焊缝、波纹钢管质量的程序。使用的程序包括使用直径为25 mm的半球形冲头和内径为38 mm的异形模具，使短长度的焊缝变形。

This method describes the procedure to be used in determining the quality of the seam or helical, continuously welded seam, corrugated steel pipe. The procedure to be used involves distorting a short length of welded seam by using a 25-mm diameter, hemispherical punch and a 38-mm inside diameter contoured die.