承压设备上的中、小径管管座易发生损坏，但由于其结构复杂而多对其进行表面检测，这难以满足其运行的安全性要求。通过总结承压设备上管座的结构形式，分析了不同类型管座的超声波检测的可行性。针对能实施检测的管座形式，讨论了其超声波的覆盖性及可能漏检的缺陷，提出补加多种检测方法可实现管座的可靠检测；提出了探头在主管面上检测角焊缝时缺陷回波的精确简便的定位计算方法，使主管道检测易于实施。通过大量的管座检测试验及管座解剖，证实检测效果能满足管座角焊缝的安全运行要求。

The middle and small-size diameter tube seats on the pressure-equipment are prone to damage, but due to its complex structure, only surface inspections are performed and it is difficult to satisfy the safety of the operation. By summarizing the structure of the headers on the pressure pipeline, the feasibility of ultrasonic test for different types of sockets is analyzed, and the coverage of the ultrasonic test and defects that may be missed is discussed for sockets that can be inspected. The reliability of pipe pedestal detection is realized by adding multiple detection methods. An accurate and simple positioning calculation method for detecting the flaw echo made the main pipeline inspection easy to implement. Through a large number of tube seat detection tests and socket anatomy, it is proven that the test results can meet the safe operation requirements of the fillet weld of the seat.