Year: 2003
Type: conference-paper
Abstract: The multi-pass welding on the dissimilar welds can cause the microstructure variation and tensile residual stress generation, which may deteriorate the fatigue lifetime, on the heat affected zone (HAZ).The difference of thermal expansion and conductivity on these welds makes them particularly sensitive to thermal fatigue cracking.But, it is difficult to find the previous researches about a relation between the fatigue lifetimes of the dissimilar welds on real nuclear components and the unique nature (the microstructure variation, residual stress, and different thermal expansion/ conductivity) of these welds.So, in this study, the microstructures, tensile properties and stress distributions of HAZ on nuclear components are predicted by using the semi-analytical method and finite element method.And, the fatigue lifetimes of the dissimilar welds on nuclear components are evaluated by using the stress analysis results and the fatigue analysis procedure of ASME B&PV Code Sec.III.Finally, the effect of the unique nature of the dissimilar welds on fatigue lifetime is reviewed.
Authors: Jong Sung Kim, Se-Hwan Lee, Tae‐Eun Jin
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3197225514