Effect of preemptive weld overlay on residual stress mitigation for dissimilar metal weld of nuclear power plant pressurizer

Tae Kwang Song, Hong Yeol Bae, Yun Bae Chun, Chang Young Oh, Yun Jae Kim, Kyoung Soo Lee, Chi Yong Park

Research output: Contribution to journalArticle

3 Citations (Scopus)


Weld overlay is one of the residual stress mitigation methods which arrest crack initiation and crack growth. Therefore weld overlay can be applied to the region where cracking is likely to be. An overlay weld used in this manner is termed a preemptive weld overlay(PWOL). In pressurized water reactor(PWR) dissimilar metal weld is susceptible region for primary water stress corrosion cracking(PWSCC). In order to examine the effect of PWOL on residual stress mitigation, PWOL was applied to a specific dissimilar metal weld of Kori nuclear power plant by finite element analysis method. As a result, strong compressive residual stress was made in PWSCC susceptible region and PWOL was proved effective preemptive repair method for weldment.

Original languageEnglish
Pages (from-to)873-881
Number of pages9
JournalTransactions of the Korean Society of Mechanical Engineers, A
Issue number10
Publication statusPublished - 2008 Oct 1



  • Dissimilar metal weld
  • Preemptive weld overlay
  • Welding residual stress

ASJC Scopus subject areas

  • Mechanical Engineering

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