Technological method for improving collapse and softening of vehicle 6-series aluminum alloy laser welding butt joint

The invention discloses a process method for improving collapse and softening of a vehicle 6-series aluminum alloy laser welding butt joint, aims to improve poor joint forming and softening and improve the mechanical property of the joint, belongs to the technical field of thin plate laser welding, and is suitable for formulation and quality control of a welding process. By perfecting the structure simulation model, the quantitative relation of the macroscopic welding process, the microstructure evolution parameters, the forming parameters and the mechanical performance is established, and the effectiveness of the quantitative relation model is verified. The analysis result shows that on the basis of ensuring the welding process parameters of root fusion, the laser power is properly reduced, the welding speed is increased, the welding seam collapse behavior is obviously improved, and the joint strength is effectively improved. The method has important reference value and guiding significance for improving the