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Investigation into Variations of Welding Residual Stresses and Redistribution Behaviors for Different Repair Welding Widths

보수용접부 폭에 따른 용접잔류응력의 변화 및 재분배 거동 평가

  • Park, Chi-Yong (Central Research Institute, Korea Hydro & Nuclear Power Corporation) ;
  • Lee, Hwee-Sueng (Dept. of Mechanical System Design Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Huh, Nam-Su (Dept. of Mechanical System Design Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 박치용 (한국수력원자력(주) 중앙연구원) ;
  • 이휘승 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 허남수 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2013.09.22
  • Accepted : 2013.12.18
  • Published : 2014.02.01

Abstract

In this study, we investigated the variations in welding residual stresses in dissimilar metal butt weld due to width of repair welding and re-distribution behaviors resulting from similar metal welding (SMW) and mechanical loading. To this end, detailed two-dimensional axi-symmetric finite element (FE) analyses were performed considering five different repair welding widths. Based on the FE results, we first evaluated the welding residual stress distributions in repair welding. We then investigated the re-distribution behaviors of the residual stresses due to SMW and mechanical loads. It is revealed that large tensile welding residual stresses take place in the inner surface and that its distribution is affected, provided repair welding width is larger than certain value. The welding residual stresses resulting from repair welding are remarkably reduced due to SMW and mechanical loading, regardless of the width of the repair welding.

Keywords

Dissimilar Metal Butt Weld;Finite Element Analysis;Repair Welding;Welding Residual Stress

Acknowledgement

Supported by : 서울과학기술대학교

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  1. Stress Distributions at the Dissimilar Metal Weld of Safety Injection Nozzles According to Safe-end Length and SMW Thickness vol.39, pp.10, 2015, https://doi.org/10.3795/KSME-A.2015.39.10.979