Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on Machining Effects on Residual Stress at Dissimilar Metal Weld Region

기계가공이 이종용접부의 잔류응력에 미치는 영향에 관한 연구

  • Lee, Kyoung-Soo (KEPCO Research Institute, Nuclear Power Generation Laboratory) ;
  • Lee, Jeong-Geun (KEPCO Research Institute, Nuclear Power Generation Laboratory) ;
  • Lee, Seong-Ho (KEPCO Research Institute, Nuclear Power Generation Laboratory) ;
  • Park, Chi-Yong (KEPCO Research Institute, Nuclear Power Generation Laboratory) ;
  • Lee, Seung-Geon (KEPCO Engineering and Construction, Electric Power Technology Laboratory) ;
  • Park, Jai-Hak (Chungbuk National University, Safety Engineering Department)
  • 이경수 (한국전력공사 전력연구원 원자력발전연구소) ;
  • 이정근 (한국전력공사 전력연구원 원자력발전연구소) ;
  • 이성호 (한국전력공사 전력연구원 원자력발전연구소) ;
  • 박치용 (한국전력공사 전력연구원 원자력발전연구소) ;
  • 이승건 (한국전력기술주식회사 전력기술연구소) ;
  • 박재학 (충북대학교 공과대학 안전공학과)
  • Received : 2010.12.03
  • Accepted : 2011.03.17
  • Published : 2011.04.30
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Abstract

his paper aimed to understand the residual stress in the dissimilar metal welds of nuclear power plant. Two kinds of residual stress were considered, which caused by welding and machining. Residual stress due to mechanical machining was measured by hole-drilling technique and x-ray diffraction method for the SA508 and F316L. Weld residual stress at dissimilar metal weld between SA508 and F316L was evaluated by FEA. Residual stress profiles were obtained for the inside surface and through thickness of welds. Machining effect was also analyzed by FEA. According to the residual stress measurement, it was observed that mechanical machining can generate tensile stress on the surface of the test material. However, FEA results showed that mechanical machining did not increase the tensile stress on the surface of weld region. Further study with more elaborate measurement and numerical analysis is required to identify the effect of machining on residual stress in the dissimilar metal weld region.

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References

  1. R.S. Pathania : PWSCC of Alloy 600 Materials in PWR Primary System Penetrations, EPRI TR-103696, July 1994
  2. P. Scott : Experimental Program on the Effects of Surface Condition on Primary Water Stress Corrosion Cracking of Alloy 182 Welds, August 2007
  3. R. Pathania : Mechanics and Mechanism of Environmentally Assisted Cracking of Alloys 132/182 in BWR and PWR Environments, October 2004
  4. C. King, P. O'Regan : Alloy 82/182 Pipe Butt Weld Safety Assessment for U.S PWR Plant Designs, April 2005
  5. R.H. Leggatt : Residual stresses in welded structures, IJPVP 85 (2008) 144-1511
  6. K. Ahluwalia, C. King : Review of stress corrosion cracking of alloy 182 and 82 in PWR primary water service (MRP-220), EPRI, October 2007
  7. P. O'Regan, Welding Residual and Operating Stresses in PWR Alloy 182 Butt Welds (MRP-106), EPRI, Palo Alto, CA;2004. 1009378
  8. K.S. Lee, T.R. Kim, J.H. Park, M.W. Kim, S.Y. Cho : 3-D Characteristics of the Residual Stress in the Plate Butt Weld between SA508 and F316L SS, KSMEA, 33-4 (2009) 41-409 (in Korean) https://doi.org/10.3795/KSME-A.2009.33.4.401
  9. K.S. Lee, C.Y. Park, H.D. Kim, J.S. Kim, J.H. Park : Preliminary Evaluation of Primary Water Stress Corrosion Cracking Initiation Potential on Small Penetration Nozzle Welds by Residual Stress Analysis, Journal of KPVP, 3 (2007) 101-108 (in Korean)
  10. Y.J. Kim., T.K. Song, H.Y. Bae, T.K. Song, H.Y. Bae, K.S. Lee, C.Y. Park, J.S. Yang, N.S. Huh, J.U. Kim, J.S. Park, M.S Song, S.K. Lee, J.S. Kim, S.C. Yu, Y.S. Chang : Assessment of round robin analyses results on welding residual stress prediction in a nuclear power plant nozzle, Transactions of the KSME A, 33-1 (2009) 72-81 (in Korean) https://doi.org/10.3795/KSME-A.2009.33.1.72
  11. T.K. Song, H.Y. Bae, Y.B Chun, C.Y. Oh, Y.J. Kim, K.S. Lee, C.Y. Park, Estimation of Residual Stress Distribution for Pressurizer Nozzle of Kori Nuclear Power Plant Considering Safe End, Transactions of the KSME A 32-8 (2008) 668-677 (in Korean) https://doi.org/10.3795/KSME-A.2008.32.8.668
  12. T.K. Song, H.Y. Bae, Y.J. Kim, K.S. Lee, C.Y. Park : Sensitivity Analysis of Finite Element Method for Estimating Residual Stress of Dissimilar Metal Multi-Pass Weldment in Nuclear Power Plant, Transactions of the KSME A 32-9 (2008) 770-7816 (in Korean)
  13. S.B.Shin, D.J.Lee and D.H.Park : A Study on the Evaluation of Transverse Residual Stress at the Multi-pass FCA Butt Weldment using FEA, Journal of the KWJS, 28-4 (2010), 26-32 (in Korean) https://doi.org/10.5781/KWJS.2010.28.4.026
  14. G. Parrish : Influence of microstructure on properties of case - carburised components, Heat Treta. Met. 4-2 (1977), 45-54
  15. W. Asano, J. Katsuyama, K.Onizawa, M. Mochizuki, M. Toyoda : Effect of Surface-Machining and Butt- Welding on Residual Stress and Hardness of Type 316L Stainless Steel Pipes, Proceedings of PVP 2008-61441, July 27-31, 2008
  16. ASTM, 2001, Standard test method for determining residual stresses by the hole-drilling strain gage method, ASTM E837-01
  17. SAE Handbook, Residual Measurement by X-Ray Diffraction, SAE J984a, 1971
  18. MSC, PATRAN, Ver. 2007, 2007
  19. HKS, ABAQUS, Ver. 6.8, 2008
  20. Jian Lu, "Handbook of Measurement of Residual Stress", The Fairmount Press Inc. 1996
  21. C. Harrington, Advanced FEA evaluation of growth of postulated circumferential PWSCC flaws in pressurizer nozzle dissimilar metal weld, MRP-216 of EPRI, August 2007