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- Title
Numerical investigation on welding residual stresses in a PWR pressurizer safety/relief nozzle.
- Authors
Tae-Kwang Song; Hong-Ryul Bae; Yun-Jae Kim; Kyung-Soo Lee
- Abstract
This paper presents finite element simulation results of residual stresses in dissimilar metal welds of a PWR pressurizer safety/relief nozzle. The present results are believed to be significant in two aspects. The first one is to consider the effect of the presence of similar metal welds on resulting residual stresses. The second one is the mitigation effect of the overlay welding thickness on residual stresses. After dissimilar metal welding, tensile residual stresses are present both at the inner surface and at the outer surface of dissimilar metal welds. Adjacent similar metal welding, however, decreases residual stresses to compressive ones at the inner surface of dissimilar metal welds, possibly due to the bending mechanism caused radial contraction of the weld. At the outer surface of dissimilar metal welds, similar metal welding increases residual stresses. Overlay welding further decreases residual stresses at the inner surface of dissimilar and similar metal welds, but increases slightly residual stresses at the outer surface.
- Subjects
RESIDUAL stresses; WELDABILITY of metals; PRESSURIZED water reactors; FINITE element method; COMPUTER simulation
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2010, Vol 33, Issue 11, p689
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2010.01480.x