海底管线相关标准规定，相控阵超声得到90%检出率对应的缺陷尺寸（高度极限值）不超过1 mm，方可应用于海底管线焊缝检测，因此，确定相控阵超声检测工艺的POD（检出率）值成为技术能否应用的关键。设计制作了一系列具有不同尺寸、不同类型缺陷的测试焊缝，采用相控阵超声扇形扫描技术，对其进行了重复性及可靠性试验，充分验证了工艺的重复稳定性，获得了95%置信水平和90% POD值的结果，实现了工程上的应用。

The relevant standards stipulate that the defect size (height limit value) corresponding to a 90% detection rate obtained by phased array ultrasonic testing should not exceed 1mm before it can be used for subsea pipeline weld testing. Therefore, the determination of POD value of phased array ultrasonic sectorial scanning technique becomes the key factor to the application. This paper introduces the ultrasonic technique application based on phased array sectorial scanning, designs and manufactures a series of welds with different dimensions and different types of defects. By comparing the evaluation result of phased array sectorial scanning with the actual size of defects and performing the repeatability and reliability test, a result of the reliability of 95% and POD value of 90% was obtained, and therefore the project application was successfully implemented.