オーステナイト系ステンレス鋼の多層溶接部における ・ 溶接直後急冷による残留応力改善技術の開発
Development of Residual Stress Improvement Technology for Multi-Layer Welded Joint of Austenitic Stainless Steel Using Rapid Cooling During Welding
柳田 信義 Nobuyoshi YANAGIDA 小出 宏夫 Hiroo KOIDE
Finite Element MethodMulti-Layer Welded JointResidual stressStress Corrosion Cracking
To reduce tensile residual stress in a welded region, we developed a new welding method that applies a water-shower behind the welding torch. To verify the effects of the meth od, specimens welded with or without water shower cooling were manufactured. Residual stresses of the specimens were experimentally measured. It was found that tensile residua l stresses were generated on the surface of the welds and those were reduced in the case that the water-shower was applied. These measurement results agree well with the FEM analyses. It can therefore be concluded that the water-shower cooling during welding is appropriate for reducing tensile residual stress in austenitic stainless steel welding.