Journal of Welding and Joining

  • 제33권1호
  • /
  • Pages.87-93
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  • 2015
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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원전 가압기 히터슬리브 J-Groove 이종금속 용접부 보수를 위한 용접 공정변수 최적화에 관한 연구

A Study on optimization of welding process parameters for J-Groove dissimilar metal weld repair of pressurizer heater sleeve in nuclear power plants

  • 조홍석 (서울과학기술대학교 에너지환경 대학원 에너지시스템 공학과) ;
  • 박익근 (서울과학기술대학교 기계.자동차공학과) ;
  • 정광운 (한전KPS(주) 기술연구원)
  • 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)
  • 투고 : 2015.01.20
  • 심사 : 2015.02.28
  • 발행 : 2015.02.28
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초록

This study was performed to develop repair technology for J-Groove dissimilar metal weld of pressurizer heater sleeve in nuclear power plants. Pad, J-Groove automatic welding and mechanical machining equipments to develop repair technology using 'Half Nozzle Repair' were designed and manufactured. To obtain the optimum welding process parameters during Pad temperbead overlay welding, several welding experiments using Taguchi method were conducted. Weldability of Pad overlay weld specimens was estimated by PT/RT test, FE-SEM, EDS and Vickers hardness test. Also, J-Groove welding to adjust weld shape conditions requiring in ASME Code was carried out and its integrity of weld specimens was evaluated through PT/RT test and optical microscope. Consequently, it was revealed that Pad and J-Groove overlay welding for dissimilar metal weld of pressurizer heater sleeve could be possible to meet Code standard without weld defect.

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참고문헌

  1. Materials Reliability Program-87, PWSCC of Alloy 600 type materials in non-steam generator tubing applications - Survey report through June 2002, (2006), Electric Power Research Institute
  2. Materials Reliability Program-341, Laboratary examination results for Calvert Cliffs-2 pressurizer heater sleeve assembly, Electric Power Research Institute, (2012)
  3. Materials Reliability Program-102, South Texas Project Unit 1 bottom mounted instrumentation nozzles (#1 and #46) analysis reports and related documentation, Electric Power Research Insitute, (2009),
  4. Materials Reliability Program-167, Satety evaluation for boric acid wastage of PWR reactor vessel bottom heads due to bottom-mounted nozzle leakage, Electric Power Research Institute, (2012)
  5. Materials Reliability Program-220, Review of stress corrosion cracking of alloys 182 and 82 in PWR primary water service, Electric Power Research Institute, (2006),
  6. In Chul Jung, Deog Nam Shim and Jin Gui Byun, Overlay welding of Inconel material for nuclear power components, Journal of KWJS, 27-2 (2009), 4-6 (in Korean)
  7. ASME Code Case N-638-1
  8. 이상복, 제3판 , 기초부터 현장까지 알기쉬운 다구찌기법 (in Korean)
  9. D.W. Gandy, S.J. Findlan and W.J. Childs, Repair welding of SA508, Class 2 pressure vessel steels utilizing the consistent layer temperbead technique, Materials Ageing and Component Life Extension International Symposium, (1995), 961-978
  10. ASME Code Case N-754