An improvement of the creep-fatigue evaluation method for the tube-header welding parts of the electric power generation boiler operated frequently start-stop operating condition is strongly required.In this paper, firstly, specimen-based evaluation method was established through the creep-fatigue test using acutual welding simulated, acutual size specimens and the theoretical analysis about those specimens. Secondarily, the computer code, that compute stress history under alternative temperature and strain conditions imaged actual boiler operation, and presume creep-fatigue life using same analysis method for the tested specimens was developed.This computer code was applied to analyze the cracked tube welding of actual boiler. Consequently, it was showed very good agreement between the predicted life by this code and the actual life. So, it was proved that this computer code was very successful.
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