针对HDPE （高密度聚乙烯）管道热熔接头超声检测声衰减大，检测信噪比低等问题，通过CIVA仿真软件中的超声模块对厚壁HDPE管道进行声场仿真，研究了探头频率、晶片尺寸和阵元排列对管道热熔接头中声场分布的影响，优化了检测用相控阵超声探头参数。采用优化的探头和检测工艺在含标准反射体和典型缺陷的试件上进行声场仿真和检测试验，结果表明，提出的检测工艺可全部检出φ 914.4 mm管道中预设的不同深度和类型的典型缺陷，整体检测效果较好。

In view of the characteristics of high acoustic attenuation and low SNR of butt fusion joints in HDPE pipes, the ultrasonic module of CIVA simulation was used to simulate the sound field of thick-wall HDPE pipes. The influence of probe frequency, element size and array arrangement on the sound field distribution in butt fusion joints was studied, and the phased array probe parameters for inspection were optimized. According to the optimized probe and inspection process, the sound field simulation and inspection were carried out on the test specimen containing standard reflector and typical defects. The inspection process could detect all the typical defects of different depths and types preset in the pipes of φ 914. 4 mm.