由于球形封头上插入式管接头角焊缝在封头表面的视线位置与其在球面法线方向的投影不一致 ,所以按超声波正常定位方法所确定的缺陷水平位置经常会定位于焊缝的表面范围之外 ,给探伤人员和缺陷返修人员造成一定的错觉。本文提出了以接管外壁为参考点的位置分析方法 As the spherical head of the fillet weld on the head surface of the fillet weld line of sight and its projection in the spherical normal direction is inconsistent, so by ultrasonic normal positioning method to determine the level of the defect level is often located in the weld surface area In addition, the inspection staff and defective rework staff create a certain illusion. In this paper, the position analysis method of taking the outer wall as the reference point is proposed