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다층용접배관의 용접부 잔류음력분포에 대한 기하학적형상과 용접후처리의 영향
김철한,조선영,김복기,배동호 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.1
In this study, the residual stress fields of multi-pass welded were analyzed by FEA under various geometrical conditions. In order to estimate the effects of pipe geometries on residual stress distribution, welding processes of each model were performed under the same heat cycles. And then, the influence of cutting off the weld bead on the residual stress redistribution was also estimated. From the results, in the range of t/D=0.05, axial residual stresses on the outer surface of the welded pipe were linearly decreased with pipe diameter increase. On the other hand, hoop residual stresses were not influenced by them. And both axial and hoop residual stresses on the outer surface of the welded pipe were increased with pipe diameter increase. But, when t/D was smaller than 0.05, they were converged in the nearly same value. The maximum residual stresses were generated at around HAZ. It in therefore necessary to consider them in welding design, strength evaluation, and analysis of fracture characteristics.
종 방향 버트 용접으로 제작된 고망간강 라이저 파이프의 잔류응력 연구 (1) : 잔류응력 계측 및 수치해석
이명수(Myung-Su Yi),서정관(Jung-Kwan Seo) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.2
In recent years, the deep and ultra-deep seas are recognized as the last remaining regions on the planet where oil and natural gas resources are discovered and produced. In order to develop such natural resources in an environmentally safe and cost-effective method, various engineering systems and technologies are being developed. In keeping with this direction of development, there is significant worldwide interest among major offshore structural and system operators in examining the possibility of using high-strength steel for long-distance gas transmission pipelines and risers. In particular, riser pipes using high manganese steel are often made by longitudinal butt welding, In order to make a riser, which is a large pipe structure, it is necessary to do pipework to bend the plate. At this time, welding is required in the longitudinal direction of the riser, and this welding is the longitudinal butt welding. But studies related to the prediction of residual stresses for this are insufficient. In this paper, the residual stress values of longitudinal butt welding of high manganese steel using the hold drilling method were measured. Furthermore, the residual stresses in various directions were calculated using a precise thermal-elastic analysis technique, and comparative verification with the measured values was conducted to see if this method is valid as a residual stress prediction method.