Temperature and stress field analysis of 7075 aluminum alloy laser-MIG composite welding

Abstract In this paper, Simufact.Welding simulation software is used to simulate the temperature field and stress field of 6 mm thick 7075 aluminum alloy laser-MIG composite welding, and the influence of different welding process parameters on the temperature field and stress field is explored for simulation and analysis. By using welding simulation software, a numerical simulation model is established, and reasonable welding process parameters are selected to analyze the simulation results. The influence law of welding parameters on temperature field and stress field of laser-MIG composite welding of 7075 aluminum alloy was explored, plotting the temperature field distribution of the weldment during heating and cooling, and analyzing the temperature change of the molten pool and the nearby area in each time period. The thermal cycle curves of each point on the workpiece were recorded and compared with the simulation results to verify the accuracy of the temperature field simulation. A cloud diagram of the dynamic change characteristics of stress in the workpiece during welding heating and cooling is drawn to analyze the influence of welding process parameters on the residual stress in different directions.