在客观的试验数据基础上，通过附加有独立TOFD探头的AUT系统在设置20%及40%的检验阈值条件下，对管线对接环焊缝进行检验，统计出了缺陷高度结果，结合缺陷的宏观切片数据，通过数学建模，以在95%的可信度上达到90%的检出率作为合格的标准，建立“缺陷高度-检出率”的曲线，对该AUT系统的检出能力做出了一个量化的分析、对比，从而对于不同的验收标准情况下(主要包括ECA及WORKMANSHIP)应当如何使用相应的检验阈值给予建议。

Based on the objective experimental data and pipeline girth weld inspection results by the AUT system with separate TOFD probes using threshold setting up 20% and 40%, the statistical results of defect height were obtained. By combining these results with macro slicing data of the defects and through mathematical modeling, a “flaw height-POD” curve was established under the condition of achieving 90% detection rate with 95% reliability as a qualified standard. A quantitative analysis and comparison was made for the AUT system on its detection ability in order to put forward suggestions for different acceptance standards (including the ECA and WORKMANSHIP) with related inspection thresholds.