Analysis on Welding Crack of Subcritical Power Station Boiler Platen Superheater Header

Yan Ting Feng; Xiang Feng Zheng; Xue Xia Xu; Guo Zhen Dong; Yong Wang; Peng Sun

doi:10.4028/www.scientific.net/AMM.251.446

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Analysis on Welding Crack of Subcritical Power Station Boiler Platen Superheater Header
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 251Analysis on Welding Crack of Subcritical Power...

Analysis on Welding Crack of Subcritical Power Station Boiler Platen Superheater Header

Abstract:

Welding crack analysis was carried out on tee joint crack of boiler platen superheater header (12Cr1MoV) of subcritical power station applying finite element analysis,microanalysis, mechanical properties test, chemical composition analysis, metallography examination and SEM observation etc. Results indicated that the improper structure, the original welding defects, higher welding heat input, excessive welding residual stress and improper heat treatment led to cold crack and reheat crack ,then induced to the leakage failure while operating.the welding crack originated at the original defects, connected with reheat cracks during propagation and led to leakage finally.