YANG Chengming, QIU Jian, ZHOU Zhe, et al. Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit[J]. 2022, 42(6): 119-122.
YANG Chengming, QIU Jian, ZHOU Zhe, et al. Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit[J]. 2022, 42(6): 119-122. DOI: 10.3969/j.issn.1008-0198.2022.06.021.
Analysis and Treatment of Tee Butt Welding Cracks Failure in 1 000 MW Ultra-Supercritical Unit
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.