针对压力管道元件(螺旋焊管)制造单位存在超声波检测时缺陷检出率较低，导致生产的螺旋焊管质量不满足制造标准要求但却出厂的问题，通过对探头K值的研究，确定进行缺陷准确定位的探头选取原则以及对发现的缺陷进行定位的方法，为产品检验及监检人员审查螺旋焊管超声波检测报告的准确性和真实性提供了依据，减少了不合格产品出厂的几率。

It is a great problem for many pressure piping components(spiral pipe) manufacturers that the quality of the spiral welded pipes does not conform to the manufacturing standards resulted by the low detection rate during the ultrasonic flaw detection. In order to solve this problem, the selection principle of the probe and the accurate localization methods were given through analyzing the K-value of the probe in this study. And it provided a basis for the inspectors and supervisors reviewing the ultrasonic test reports of the spiral welded pipes to reduce the unqualified rate.