Numerical simulation on in-serve welding of natural gas pipeline

被引：0

作者：

Liu Y. ^{[1
]}

Feng L. ^{[2
]}

Zhang J. ^{[1
]}

Xu Z. ^{[3
]}

Li Z. ^{[3
]}

机构：

[1] Gas Technology Institute of Petrochina KunLun Gas Co., Ltd., Harbin

[2] Kunlun Energy Company Limited, Beijing

[3] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 10期

关键词：

Deformation; In-serve welding; Numerical simulation; Residual stress; Temperature field;

D O I：

10.12073/j.hjxb.2019400001-y

中图分类号：

学科分类号：

摘要：

During the in-service welding of natural gas pipeline, large depth of molten pool can result into low strength of the un-melted material at the bottom of the molten pool. The pipeline will fail if it cannot bear the inner gas pressure. To avoid this, this work used MSC∙Marc software to simulate the in-service welding of natural gas pipeline. Tungsten Inert Gas (TIG) Welding was employed. The simulation result of the temperature field showed that the peak temperature of the inner wall of the pipe was 1 131℃ under a welding current of 220 A and did not exceed the melting point of the pipe material. Under this temperature, the yield strength of the material was 19 MPa, which was higher than the gas pressure inside the pipe. Burnthrough easily appeared when the welding currents ranged from 240-260 A. The surrounding of the cover plate was a closed ring weld. The stress field was more complicated than that of the straight weld. The results showed that the residual stress distribution was asymmetrical and its peak value was 212.3 MPa under the welding current of 220 A. The maximum deformation of the cover was 1.79 mm. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.

引用

页码：111 / 115and120

共 6 条

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