为查明干气压缩机后冷凝器在服役现场泄漏的原因，分析了其管板与换热管的连接结构，并用里氏硬度计对管板和换热管进行了硬度检测。结果表明，强度胀加密封焊结构不能在12.1MPa的设计压力下使用，且管板基材与换热管硬度、强度不匹配。建议改为强度焊加贴胀结构，并将复合管板基层改用屈服强度≥320MPa的材料，制造工艺改为先胀后焊。

For detecting the reason of leakage of dry-gas-compressor′s rear condenser in its severed work field, we analyzed the linkage structure of its rube plate and heat transfer tube, and used Li KeⅡ hardometer to test the hardness. The result indicated that structure of strength expansion and seal weld can′t used under 12.1MPa of design pressure. Also, the hardness and strength of tube plate′s base material and heat transfer tube don′t match each other. It should be modified to be strength weld and tight expansion structure. At the same time, manufacturing technology as modified for welding after expansion, tube sheet base should adopt the material of strength σs≥320MPa.