大厚度压力容器焊缝中经常会存在各种焊接缺陷,实施射线检测非常困难,特别是对现场超大厚度的容器,射线检测已成为约束其制造的瓶颈,超声衍射时差法为解决此类问题提供了一种方案。TOFD技术已解决了大厚度压力容器射线检测困难的难题,因此TOFD检测技术的应用对国内大型厚壁压力容器的制造及发展具有重要意义,且具有必要性和紧迫性。 Large welds in pressure vessels often have various welding defects, so it is very difficult to carry out ray inspection. Especially for large super-thick containers in the field, ray detection has become the bottleneck restricting their manufacture. The ultrasonic diffraction time difference method provides the solution to such problems A program. TOFD technology has solved the difficult problem of large thickness pressure vessel ray detection. Therefore, the application of TOFD detection technology is of great significance to the manufacture and development of domestic large-scale thick-wall pressure vessel, and it is necessary and urgent.