电焊机2024，Vol.54Issue(7)：138-143,6.DOI:10.7512/j.issn.1001-2303.2024.07.20
T91+TP347H异种钢焊接接头失效分析
Failure Analysis of T91+TP347H Dissimilar Steel Welded Joints
黄应红 1李春桂 1梁泽宁 1张红兵1
作者信息
- 1. 中煤防城港电力有限公司,广西 防城港 538000
- 折叠
摘要
Abstract
During the operation of a supercritical boiler in a certain power plant,it was found that the T91/TP347H dissimi-lar steel welded joint at the outlet of the high-temperature reheater had fractured,causing a boiler leak.A series of tests were conducted on the failed welded joint,including macroscopic morphology observation,chemical composition analysis,metal-lographic examination,and hardness testing.Combined with the operating conditions and historical fault history of the boiler,a comprehensive analysis was made of the failure causes of the dissimilar steel welded joint.The results showed that poor weld formation and unqualified welding quality were the direct causes of the joint cracking;the large chemical compo-sition difference and uneven performance of the dissimilar steel joint itself,under long-term high temperature and stress,led to element migration,resulting in a decline in interface performance,which is the fundamental reason for the cracking of the welded joint;the deep peak shaving and frequent start-stop peak shaving of the unit further accelerated the generation of cracks.Based on the failure cause analysis,and drawing on the management standards and practical experience of dissimilar steel welded joints,subsequent maintenance inspection and metal supervision strategy optimization suggestions were put for-ward,which can provide a reference for the management of dissimilar steel welded joints in similar power plants.关键词
超临界锅炉/高温再热器/异种钢焊接/失效分析Key words
supercritical boiler/high pressure reheater/dissimilar steel welded joints/failure analysis分类
矿业与冶金引用本文复制引用
黄应红,李春桂,梁泽宁,张红兵..T91+TP347H异种钢焊接接头失效分析[J].电焊机,2024,54(7):138-143,6.
