我厂在制造30万吨/年合成氨高压设备时提出了管座角焊缝的超声波探伤问题。根据产品需要.对φ200～600毫米的厚壁管座角焊缝进行了探伤试验。本文初步总结了厚壁管座超声波探伤方法的试验情况及其在生产上的应用。同时对超声波探伤仪也作了较详细的说明,可供有关从事探伤工作人员参考。 I plant in the manufacture of 300000 tons / year ammonia pressure equipment put forward the horn fillet weld ultrasonic testing problems. According to the need of the product, the flaw detection test was carried out on the fillet welds of φ200 ~ 600mm thick-walled pipe. The paper summarizes the experimental conditions of ultrasonic testing of thick-walled tube base and its application in production. At the same time on the ultrasonic flaw detector also made a more detailed description, for staff engaged in testing related reference.