超超临界锅炉水冷壁补焊区失效原因分析

Failure Analysis on Welding Zone in Water-cooled Wall Pipe of Ultra Supercritical Power Plant Boiler

通过宏观检验、金相检验、断口分析、能谱分析等分析手段,对超超临界锅炉水冷壁补焊区失效原因进行了分析。结果表明,失效原因来自于焊接工艺和锅炉运行两方面,并提出了合理的改进措施。

By macroscopic inspection, metallographic observation, fracture analysis and EDS analysis, the failure of welding zone in water-cooled wall pipes of ultra supercritical boiler was analyzed. The results show that the main reasons for the failure are caused by two sides： welding technology and boiler operation. The relative improvement measures to prevent the occurrence of the failure are proposed.