Analysis of Welding Simulation Methods for Large Weldments

In response to the problems of long simulation time and low efficiency in the optimization process of welding process parameters for large welded parts, this paper analyzes the application of the birth and death element method and the non birth and death element method in the circumferential weld of ball valves using fully welded ball valves as carriers. The difference between the two methods in the key indicators of residual stress and deformation after welding is 17.8% and 6%, respectively, and the distribution pattern is consistent. Moreover, the birth and death element method is more in line with the actual process. Based on the analysis results, the large birth and death element method was proposed to simulate the welding process. The simulation results showed that using the large birth and death element method can improve the simulation efficiency by 28% and 12.5% respectively compared to the birth and death element method and non birth and death element method, while ensuring the accuracy of the welding simulation results.