Distribution Characteristics of Weld Residual Stress on Butt Welded Dissimilar Metal Plate

Key Words: Weld Residual Stress(용접잔류응력), Dissimilar Metal Weld(이종금속용접), Finite ElementAnalysis(유한요소해석), X-ray Diffraction Method(X-선회절법)초록: 본연구에서는최근원자력발전소에서이종금속용접접합소재로많이사용되고있는SA 508과Type 304 스테인리스강의이종금속용접잔류응력분포특성을살펴보기위하여이종금속용접시편을제작하여직접용접을실시하고X-선회절법을이용하여용접시험편의표면에서용접잔류응력을측정하였다. 또한3차원유한요소해석을통하여이종금속맞대기용접을전산모사하고시편의용접잔류응력분포를구하였다. 측정한잔류응력과유한요소해석결과계산된잔류응력을고찰함으로써3차원평판이종금속맞대기용접부의잔류응력분포특성을살펴보았다.Abstract: In this study, the weld residual stress distribution at a dissimilar-metal welded plate of low alloycarbon steel and stainless steel, which are widely used in nuclear power plants, was characterized. A platemock-up with butt welding was fabricated using SA 508 low alloy steel and Type 304 stainless steel platesand the residual stresses were measured by the X-ray diffraction method after electrolytic polishing of theplate specimen. Finite element analysis was carried out in order to simulate the butt welding of dissimilarmetal plate, and the calculated weld residual stress distribution was compared with that obtained from themeasured data. The characteristics of the three-dimensional residual stress distribution in a butt weld ofdissimilar metal plates were investigated by comparing the measured and calculated residual stress data.