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가압경수로 노즐 맞대기 이종금속용접부의 용접잔류응력 예측

Welding Residual Stress Distributions for Dissimilar Metal Nozzle Butt Welds in Pressurized Water Reactors

  • 투고 : 2010.12.13
  • 심사 : 2011.12.14
  • 발행 : 2012.02.01

초록

가압경수로의 많은 관통관 중에서 니켈 기저 합금인 Inconel alloy 600 계열의 이종금속용접부는 일차수응력부식균열에 민감하며, 이를 평가하기 위하여 용접부에 작용하는 잔류응력분포를 정확히 예측하는 것이 중요하다. 본 논문에서는 유한요소해석을 이용하여 노즐 맞대기 이종금속용접부에 작용하는 일반적인 잔류응력분포를 예측하였다. 이를 위해 노즐 맞대기 이종금속용접부의 형상을 단순화하여 특정한 형상 변수에 따른 용접부 잔류응력분포를 확인하였으며, 이를 토대로 기존 문헌에 제시된 오스테나이트계 배관 맞대기 용접부 잔류응력 분포식을 수정하여 가압경수로 노즐 맞대기 이종금속용접부에 작용하는 일반적인 잔류응력분포 예측식을 제시하였다.

키워드

이종금속용접부;가압경수로;용접 잔류응력분포;유한요소해석;일차수응력부식균열

참고문헌

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피인용 문헌

  1. Stress Distribution in the Dissimilar Metal Butt Weld of Nuclear Reactor Piping due to the Simulation Technique for the Repair Welding vol.37, pp.5, 2013, https://doi.org/10.3795/KSME-A.2013.37.5.649
  2. Investigation into Variations of Welding Residual Stresses and Redistribution Behaviors for Different Repair Welding Widths vol.38, pp.2, 2014, https://doi.org/10.3795/KSME-A.2014.38.2.177