Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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The effect of ultrasonic nano crystal surface modification for mitigation of the residual stress after weld inlay on the alloy 82/182 dissimilar metal welds of reactor vessel in/outlet nozzles

원자로 입출구 노즐 Alloy 82/182 이종금속 용접부 Weld Inlay 적용 후 초음파나노표면개질이 잔류응력 완화에 미치는 영향

  • Cho, Hong Seok (Graduate School of Energy and Environment, Seoul National Univ. of Science & Technology) ;
  • Park, Ik Keun (Dept. of Mechanical and Automotive Engineering, Seoul National Univ. of Science & Technology) ;
  • Jung, Kwang Woon (Technology Research and Development Institute, KEPCO KPS)
  • 조홍석 (서울과학기술대학교 에너지환경 대학원 에너지시스템 공학과) ;
  • 박익근 (서울과학기술대학교 기계.자동차공학과) ;
  • 정광운 (한전KPS(주) 기술연구원)
  • Received : 2015.01.26
  • Accepted : 2015.03.31
  • Published : 2015.04.30
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Abstract

This study was performed to investigate the effect of ultrasonic nano crystal surface modification (UNSM) on residual stress mitigation after Weld Inlay repair for butt dissimilar metal weld with Alloy 82/182 in reactor vessel In/Outlet nozzle. As-welded and Weld Inlay specimens were made in accordance with design standard of ASME Code Case N-766, and two planes of their weld specimens were peened by the optimum UNSM process condition. Peening characteristics for weld specimens after UNSM treatment were evaluated by surface roughness and Vickers hardness test. And, residual stress for weld specimens developed from before and after UNSM treatment was measured and evaluated by instrumented indentation technique. Consequently, it was revealed that the mitigation of residual stress in weld metal after Weld Inlay repair of reactor vessel In/Outlet nozzle could be possible through UNSM treatment.

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References

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