YANG Erjuan, LI Yong, MI Zihao, et al.Numerical Simulation of Residual Stress and Life Prediction of Welding Blocked Pipes of Reactor Steam Generator[J].Electric Welding Machine, 2023, 53(5): 12-20. DOI： 10.7512/j.issn.1001-2303.2023.05.02.
Numerical Simulation of Residual Stress and Life Prediction of Welding Blocked Pipes of Reactor Steam Generator
For the welded reactor steam generator, on the one hand, the residual stress of the welded joint provides conditions for stress corrosion; on the other hand, the increase of service temperature in the advanced reactors will cause more obvious creep phenomenon. Based on the data provided in the Nims database and ASME standards, for two different welding structures, this paper calculates the residual stress of heat transfer tube plug circumferential welding at the high temperature end of Incoloy 800H material and the low temperature end of T22 material, and predicts the life of welded pipe plug under the creep fatigue interaction based on the linear damage accumulation criterion. The results show that the point of maximum residual tensile stress occurs at the root of the weld, and the residual stress of the grooved structure is higher than that of the non-grooved structure. Compared with the data provided by the Nims database, the life calculated by the ASME standard is more conservative. The life of the grooved structure is lower than that of the non-grooved structure.
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