关于低温金属管道焊缝检验的探讨

Discussion of weld examination on metallic piping for low-temperature application

在目前国内外的工业标准中,对低温金属管道焊缝的无损检验存在较大的差异。为了在兼顾安全性和经济性的同时探讨合理、可操作的解决方法,本研究基于金属材料的性能和断裂机理,对金属材料及焊缝出现低温脆断的可能性进行了分析。根据分析的结果,提出了与目前标准不同的低温金属管道焊缝检验的建议性方案,即按材质和温度进行检验。

In current domestic and international industry standards, the differences exist in terms of NDT examination of weld on low-temperature metallic piping. In order to seek for an applicable and operational method in consideration of both safety and economics, the possibility of low-temperature brittle fracture occurred in metallic materials and their welds is analyzed on the basis of metallic material characteristics and fracture mechanisms. On the basis of analysis results, an examination scheme different from those specified in the current applicable standards is recommended, in which weld examination is performed in accordance with material and temperature.