B型套筒角焊缝缺陷相控阵超声检测数值模拟

Numerical simulation of phased array ultrasonic testing for fillet weld defects of type-B sleeve

B型套筒修复是目前油气长输管道主要的永久性修复方式之一,在B型套筒修复施工过程中,角焊缝常出现焊接缺陷,需使用相控阵超声法进行检测和评定。为评价相控阵超声检测方法对于B型套筒角焊缝内部缺陷的检测能力,利用自主开发的超声数值模拟程序建立B型套筒角焊缝相控阵检测计算模型,模拟得到相控阵超声在B型套筒角焊缝内部传播声场、检测信号及扇扫图像,并据此比较、分析缺陷类型、位置及尺寸对缺陷相控阵超声检测能力的影响,最终通过试验对模拟结果进行验证。研究结果可为优化B型套筒焊缝相控阵超声检测方法提供理论基础和技术手段。

Type-B sleeve repair is one of the main permanent repair methods for long-distance oil and gas pipelines at present.However,fillet weld defects are often produced during the operation,which need to be detected and evaluated by phased array ultrasonic method.In order to further study the capability of phased array ultrasonic testing method in detecting the defects in the fillet weld of type-B sleeve,the calculation model of phased array testing for fillet weld of type-B sleeve was established with the developed ultrasonic numerical simulation program,and the simulation on propagation sound field,testing signal and image of phased array ultrasonic in fillet weld of type-B sleeve was realized.On this basis,the detection capabilities of different phased array ultrasonic testing methods for defects at different positions in the weld were compared and analyzed.Finally,the simulation results were verified by experiments.The research results could provide theoretical basis and technical means to optimize the phased array ultrasonic testing method for weld of type-B sleeves.(13 Figures,1 Table,21 References)