电焊机2024，Vol.54Issue(4)：84-90,7.DOI:10.7512/j.issn.1001-2303.2024.04.12
火电厂锅炉水冷壁焊缝泄漏失效分析
Failure Analysis on Weld Leakage of Boiler Water Wall in Thermal Power Plant
校林飞 1杨占君 1郑准备 1张建伟 1周宁 1何华 1谭永生 1陈璟 1吴宇星1
作者信息
- 1. 大唐西北电力试验研究院,陕西 西安 710021
- 折叠
摘要
Abstract
A circumferential crack appeared in the middle of a 12Cr1MoV water wall butt weld,leading to leakage failure.In order to investigate the cause of leakage failure,macro inspection,magnetic particle testing,hardness testing,metallo-graphic analysis,full element analysis and energy spectrum analysis were carried out on the weld,and a model was estab-lished to discuss the causes of water wall weld leakage failure in four stages.The research shows that the inclusion of S ele-ment in the weld is the main control factor of the weld leakage failure.The contraction tensile stress provides the conditions for the formation of intergranular hot cracks for the low melting point eutectic that segregates at the grain boundary.The in-tervention of oxygen causes local oxidation of the hot cracks.The actual operation comprehensive stress makes the oxidized intergranular hot cracks expand and fuse at multiple points,forming macro cracks,and finally leading to weld leakage,It provides a theoretical reference for leakage failure caused by intergranular thermal cracks in water wall welds of thermal power plants.关键词
水冷壁/焊缝/泄漏失效/结晶裂纹/元素偏析/低熔点共晶物Key words
water wall/weld line/leakage/crystal crack/element segregation/low melting point eutectic分类
矿业与冶金引用本文复制引用
校林飞,杨占君,郑准备,张建伟,周宁,何华,谭永生,陈璟,吴宇星..火电厂锅炉水冷壁焊缝泄漏失效分析[J].电焊机,2024,54(4):84-90,7.
