Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Method of Residual Stress Improvement by Plastic Deformation in the Pipe Welding Zone

소성변형에 의한 배관 용접부의 잔류응력 개선 방법

  • 최상훈 (한전KPS주식회사 기술연구원) ;
  • 왕지남 (아주대학교 산업공학과)
  • Received : 2013.06.19
  • Published : 2013.10.10
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Abstract

The main components, such as a reactor vessel, in commercial nuclear power plants have been welded to pipes with dissimilar metal in which Primary Water Corrosion Cracking (PWSCC) has been occurred. PWSCC has become a worldwide issue recently. This paper addresses the results of experimental and numerical analysis to prevent PWSCC by changing the stress profile that is tensile stress to compressive stress at interesting regions with plastic deformation generated by mechanical pressure. Based on the results of experimental and numerical analysis with a 6 inch pipe and dissimilar metal welded pipes, compressive stress 68~206 Mpa is generated at all locations of inner surface in the heat affected zone.

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References

  1. Findlaan, S., 2004, MRP : Mechanical Stress Improvement Process Implementation and Performance Experience for PWR Application, EPRI, pp. 5-1.
  2. Crooker, P., 2011, MRP : Welding Residual Stress Dissimilar Metal Butt-Weld Finite Element Modeling Handbook, EPRI, pp. 4-2.
  3. ASME Code Sec. XI QW-283, 2010.
  4. ANSYS 13.0 Tutorial.