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This paper takes L415 pipeline steel as the research object. The temperature field and stress field of the gas pipeline welding process are numerically simulated by using ANSYS finite element analysis software. Gradient meshing is adopted by the finite element model. The simulation of the welding heat source is realized by the band heat source model, and ANSYS is used to load the heat source in a APDL command program. In the simulation process, the element birth and death technology is used to simulate the generation of weld material, and the material constitutive relationship is a bilinear follow-up strengthening elastoplastic model that changes with temperature. The simulation results show that applying the heat source in the form of heat generation rate with a belt-shaped heat source can realize effective calculation of the residual stress field of multi-layer and multi-pass welding. The calculation results in this paper provide a mechanical reference for pipeline installation and operation.

Finite Element Analysis of Welding Residual Stress in Longdistance Gas Pipeline