Numerical investigation on welding residual stresses in a PWR pressurizer safety/relief nozzle

Tae Kwang Song, Hong Ryul Bae, Yun Jae Kim, Kyung Soo Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)689-702
Number of pages14
JournalFatigue and Fracture of Engineering Materials and Structures
Volume33
Issue number11
DOIs
Publication statusPublished - 2010 Nov 1

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Keywords

  • Finite element simulation
  • PWR pressurizer safety/relief nozzle
  • Weld overlay
  • Welding residual stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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