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FE Simulation of Submerged Arc Welding of API 5L-X70 Straight Seam Oil and Gas Pipes

M. R. Forouzan, A. Heidari, and S. J. Golestaneh

Department of Mechanical Engineering, Isfahan University of Technology
Sadid Pipe and Equipment Co., Tehran, Iran

Abstract: In this paper, an uncoupled thermo-mechanical nonlinear FE analysis of submerged arc welding process for straight seam large diameter oil and gas pipes to determine residual stresses is presented. The analysis starts with thermal part where, bi-elliptical Goldak equation is used for applying heat input distribution. Afterward, a certain code checks the elements one by one in order to determine the metallurgical phase transformations during cooling process based on cooling time from 800ºC to 500ºC ( t8/5 ). Then the associated mechanical properties of each element is calculated and assigned to the corresponding element to execute the stress analysis phase. A good agreement is observed between simulation results and experimental results obtained from metallography and hole drilling test method. In addition to the results related to the special case studied in this research, undertaking severe nonlinearities due to phase transformation of the API X70-5L material and defining the equivalent material properties during phase transformation are of the new aspects of this research..

Keywords: Oil and gas pipeline, SAW, FEM, Residual stress.

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