| Numerical simulation of stress and deformation of in-service welding onto gas pipeline |
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| 作者姓名： | 陈玉华 王勇 韩彬 王正方 |
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| 作者单位： | [1]School of Material Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang, 330063 [2]College of Mechanical and Electronic Engineering, China University of Petroleum, Dongying, 257061 |
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| 摘 要： | SYSWELD was used to simulate in-service welding process of gas pipeline of X70 pipeline steel. Welding thermal cycle, stress and deformation of in-service welded joint were studied. The results show that peak temperature of coarse grain heat-affected zone （CGHAZ） of in-service welding onto gas pipeline is the same with routine welding, but ts/5, ts/3 and ts/1 decrease at certain degree. For the zone near welded seam, axial stress and hoop stress in the inner pipe wall are compressive stress when welding source passes through the cross-section that is studied, but residual axial stress and residual hoop stress after welded are all tensile stress. Transient deformation and residual deformation are all convex deformation compared with the original pipe diameter size. Deformation achieves maximum when welding thermal source passes through the cross-section that is studied and then decreases during the cooling process after welding.
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| 关 键 词： | 油气管道 在役焊接 数值模拟 热循环 应力 形变 |
Numerical simulation of stress and deformation of in-service welding onto gas pipeline |
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| Chen Yuhua,Wang Yong,Han Bin,Wang Zhengfang.Numerical simulation of stress and deformation of in-service welding onto gas pipeline[J].China Welding,2006,15(4):46-50. |
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| Authors: | Chen Yuhua Wang Yong Han Bin Wang Zhengfang |
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| Abstract: | SYSWELD was used to simulate in-service welding process of gas pipeline of X70 pipeline steel.Welding thermal cycle,stress and deformation of in-service welded joint were studied.The results show that peak temperature of coarse grain heat-affected zone(CGHAZ)of in-service welding onto gas pipeline is the same with routine welding,but t_(8/5),t_(8/5)and t_(8/1) decrease at certain degree.For the zone near welded seam,axial stress and hoop stress in the inner pipe wall are compressive stress when welding source passes through the cross-section that is studied,but residual axial stress and residual hoop stress after welded are all tensile stress.Transient deformation and residual deformation are all convex deformation compared with the original pipe diameter size.Deformation achieves maximum when welding thermal source passes through the cross-section that is studied and then decreases during the cooling process after welding. |
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| Keywords: | in-service welding numerical simulation welding thermal cycle stress deformation |
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