海底管道环焊缝相控阵超声+超声波衍射时差法（PAUT+TOFD）检测需进行检出率（POD）分析及重复性测试认证，以评估PAUT+TOFD检测工艺应用的可靠性及稳定性。海底管道标准要求使用缺陷通用验收标准（Workmanship）验收，POD值应不大于1 mm。制作了一系列不同类型、不同尺寸的焊接缺陷，分别进行PAUT+TOFD检测及宏观切片测试，记录缺陷的所有数据，运用统计学分析方法评估得出30%评定阈值90%检出率95%可信度条件下的POD值为0.9 mm。试验结果表明，所提PAUT+TOFD检测方法满足海底管道标准DNV-ST-F101—2017《海底管线系统规范》的要求，为工程应用提供了可靠性支撑。

The qualification of Probability of Detection (POD) and repeatability test needs to be carried out for the phased array ultrasonic+time of flight diffraction (PAUT+TOFD) testing of the girth welds of submarine pipelines to evaluate the reliability and stability of the application of PAUT testing technology. The submarine pipeline standard requires the use of Workmanship for acceptance, and the POD value should not be greater than 1 mm. A series of welding defects of different types and sizes were made. PAUT +TOFD testing and macro sectioning were carried out respectively. All the data of defects were recorded. Using statistical analysis methods, it was determined that the POD value under the condition of 30% evaluation threshold 90% detection rate and 95% confidence was 0.9 mm, test results showed that the PAUT+TOFD testing method met the requirements of the submarine pipeline standard DNV-ST-F101-2017 "Submarine Pipeline System" and provided reliability support for engineering applications.