Numerical Simulation of Residual Stress in the JCO-Welding-Calibration Whole Process Forming of the Submarine Pipeline Pipes

The residual stress of submarine pipeline pipe directly affects its service safety, and the collapse resistance of submarine pipelines can be improved by controlling the residual stress, which is great significance for the long-term service of submarine pipeline pipe. In this paper, ABAQUS software was used to simulate the whole process forming of JCO-welding-compression calibration of submarine pipeline pipe. The influence of multi-directional compression calibration process parameters (number of petal molds, compression ratio and friction coefficient) on the residual stress was discussed, and the evolution law of residual stress of pipeline pipe under different forming processes was analyzed. The simulation results show that the residual stress of the calibrate pipeline pipe using the 4-petal and 8-petal molds is smaller than that of the2-petal molds; The friction coefficient has less effect on the residual stress; The average von Mises residual stress of the compression calibration pipeline pipe is 120 ± 20 MPa, which is reduced by 79% and 30% in the welded and non-welded areas, respectively, the maximum circumferential residual stress on the inner and outer surfaces is 20 MPa and −18 MPa, and the ovality of the pipeline pipe is 0.05%. The research results provide a foundation for the forming process strategy of submarine pipeline pipe.