Abstract High temperature is a typical feature of new energy processes and equipment, among which creep fatigue is one of the main failure forms of high-temperature structures. Failure accidents are often directly related to welds, and it is very important to accurately evaluate the creep fatigue damage of welds. The current ASME III-5 code is too conservative and difficult to evaluate in some cases, requiring feasible alternative methods. This article conducts a comparative analysis and study on the evaluation methods of high-temperature inelastic weld creep fatigue damage in ASME III-5 code and R5 procedure, and explores in detail the conservative composition of both. Based on the two codes, the creep fatigue damage calculation of special-shaped tee structures is carried out, and the differences in the calculation results of weld creep fatigue damage under the two codes are analyzed. The results indicate that the total creep fatigue damage of the weld calculated conservatively using R5 is 0.3253, which is much smaller than the ASME total damage of 7.299. Therefore, when the ASME engineering evaluation is overly conservative, R5 can be used as an optional code.
Yu et al. (Fri,) studied this question.