高温再热器出口联箱管座角焊缝开裂原因分析

华电技术 ›› 2019, Vol. 41 ›› Issue (8): 74-77.

高温再热器出口联箱管座角焊缝开裂原因分析

中国大唐集团科学技术研究院有限公司华中电力试验研究院，郑州〓450000

出版日期:2019-08-26 发布日期:2019-09-06

Cause analysis on the fillet weld cracking of the outlet header socket of hightemperature reheater

China Datang Corporation Science and Technology Company Limited,CentralChina Electric Power Test Research Institute,Zhengzhou 450000, China

Online:2019-08-26 Published:2019-09-06

摘要/Abstract

摘要：

某电厂高温再热器出口联箱排空气管管座角焊缝在检修期间发现裂纹缺陷，经挖补处理运行约6000h后再次开裂，发生蒸汽泄漏。通过宏观检测、光谱检验、硬度检验、金相检验、扫描电镜分析，得出管座角焊缝再次开裂的原因是补焊工艺不当，存在熔合不良等焊接缺陷，且排空气管穿过包墙处结构设计不合理，使排空气管膨胀受阻，在应力作用下，外壁产生裂纹，沿熔合线向热影响区扩展撕裂。提出了尽快对管座整体进行重新焊接并优化排空气管穿孔结构的建议。

关键词:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">高温再热器, 补焊, 融合不良, 焊接缺陷, 裂纹扩展, 膨胀受阻, 应力

Abstract:

There was a crack on the fillet weld of the ventilation tube of the outlet header socket of a hightemperature reheater in a power plant which was found during maintenance.The tube cracked again and the steam leaked after 6000h ours operation since the tube patching.Though macroscopic examination,spectral examination,hardness test,metallographic examination and scanning electron microscopic analysis,reasons for the crack are found out to be the improper repair welding which cause incomplete fusion and and other welding defects.Unreasonable structure design makes the expansion of ventilation tube hampered by the enclosed wall.Weld on the outer surfaces cracks under stress,and the crack spreads along the fusion line to the heat affected zone.It is suggested that the whole socket should be rewelded as soon as possible and the perforation structure of ventilation tube should be optimized.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">highfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">temperature reheater；repair welding, incomplete fusion, welding defects, crack propagation, expansion impediment；stress

邓辉. 高温再热器出口联箱管座角焊缝开裂原因分析[J]. 华电技术, 2019, 41(8): 74-77.

DENG Hui.

Cause analysis on the fillet weld cracking of the outlet header socket of hightemperature reheater [J]. Huadian Technology, 2019, 41(8): 74-77.

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