극후물재 용접부 내부잔류응력 측정기술 및 특성 (Characteristic and Measurement Technology of Inner Welding Residual Stresses in Thick Steel Structures)

서지정보

· 발행기관 : 대한용접접합학회
· 수록지 정보 : 대한용접접합학회지 / 34권 / 2호 / 16 ~ 21페이지
· 저자명 : 박정웅, 안규백, 우완측

초록

Recent keywords of the heavy industries are large-scale structure and productivity. Especially, the sizesof the commercial vessels and the offshore structures have been gradually increased to deliver goods andexplore or produce oil and natural gas in the Arctic. High heat input welding processes such as electrogas welding (EGW) have been widely used for welding thick steel plates with flux-cored arc welding (FCAW),especially in the shipbuilding industries. Because high heat input welding may cause the detrimental effectson the fracture toughness of the welded joint and the heat affected zone, it is essential to obtain the sufficienttoughness of welded joint. There are well known that the fracture toughness like CTOD, CVN, and KICwere very important factors in order to secure the safety of the structures. Furthermore, the welding residualstress should be considered to estimate the unstable fracture in both EGW and FCAW. However, there areno references on the welding residual stress distribution of EGW and FCAW with thick steel plates. Therefore the welding residual stresses were very important elements to evaluate the safety of the weldedstructure. Based on the measurement results, the characteristics of residual stress distribution through thicknesswere compared between one-pass electron gas welding and multi-pass flux-cored arc welding. The longitudinalresidual stress in the multi-pass flux-cored arc welding is tensile through all thicknesses in the welding fusionzone. Meanwhile, longitudinal residual stress of EGW is tensile on both surfaces and compressive at the insideof the plate. The magnitude of residual stresses by electron gas welding is lower than that by flux-cored arcwelding.

영어초록

Recent keywords of the heavy industries are large-scale structure and productivity. Especially, the sizesof the commercial vessels and the offshore structures have been gradually increased to deliver goods andexplore or produce oil and natural gas in the Arctic. High heat input welding processes such as electrogas welding (EGW) have been widely used for welding thick steel plates with flux-cored arc welding (FCAW),especially in the shipbuilding industries. Because high heat input welding may cause the detrimental effectson the fracture toughness of the welded joint and the heat affected zone, it is essential to obtain the sufficienttoughness of welded joint. There are well known that the fracture toughness like CTOD, CVN, and KICwere very important factors in order to secure the safety of the structures. Furthermore, the welding residualstress should be considered to estimate the unstable fracture in both EGW and FCAW. However, there areno references on the welding residual stress distribution of EGW and FCAW with thick steel plates. Therefore the welding residual stresses were very important elements to evaluate the safety of the weldedstructure. Based on the measurement results, the characteristics of residual stress distribution through thicknesswere compared between one-pass electron gas welding and multi-pass flux-cored arc welding. The longitudinalresidual stress in the multi-pass flux-cored arc welding is tensile through all thicknesses in the welding fusionzone. Meanwhile, longitudinal residual stress of EGW is tensile on both surfaces and compressive at the insideof the plate. The magnitude of residual stresses by electron gas welding is lower than that by flux-cored arcwelding.

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