Analysis and Treatment of Tee Butt Welding Cracks Failure  in 1 000 MW Ultra-Supercritical Unit

doi:10.3969/j.issn.1008-0198.2022.06.021

Hunan Electric Power ›› 2022, Vol. 42 ›› Issue (6): 119-122.doi: 10.3969/j.issn.1008-0198.2022.06.021

• Faults and Analysis • Previous Articles Next Articles

Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit

YANG Chengming¹, QIU Jian², ZHOU Zhe³, YUAN Dan⁴, WANG Wenliang¹

1. Hunan Xiangdian Boiler and Pressure Vessel Inspection Center Co., Ltd.,Changsha 410004, China;
2. China Energy Construction Group Hunan Thermal Power Construction Co., Ltd,Changsha 410114, China;
3. School of Materials Science and Engineering,Changsha University of Science and Technology, Changsha 410114, China;
4. Hunan Provincial Special Equipment Inspection and Testing Research Institute Loudi Branch, Loudi 417000, China

Received:2022-07-11 Revised:2022-07-26 Online:2022-12-25 Published:2023-01-13

Abstract

Abstract: There is a whole circle of circumferential cracks in steam-water separator inlet header tee butt weld for a 1 000MW ultra-supercritical unit. Through chemical composition analysis, hardness test, metallographic structure analysis, electron microscope analysis and other experimental methods, the causes of cracks are analyzed.The results show that the reason of reheat crack at weld fusion line is that the welding and heat treatment process is not carried out properly and the structure of tee is unreasonable.Optimizing the structure, welding and heat treatment process of tee can effectively prevent the generation of welding crack of this kind of tee.

Key words: ultra-supercritical, 12Cr1MoV, weld, reheat crack

CLC Number:

TK226.2

YANG Chengming, QIU Jian, ZHOU Zhe, YUAN Dan, WANG Wenliang. Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit[J]. Hunan Electric Power, 2022, 42(6): 119-122.

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Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit

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