Effect of Scanning Order on Stress Field and Deformation of CFRTP/TC4 Laser Joining Process

In order to study the effect of scanning order on the stress field and deformation of CFRTP/TC4 dual-channel laser lap joining process with TC4 as upper plate, the composite heat source model of Gaussian surface heat source and exponential rotating parabola heat source was established, and the rationality of the model was verified. The equivalent stress field and deformation of dual-channel laser joining process between CFRTP and TC4 titanium alloy were simulated to study the distribution of residual stress and deformation in different orders, and the simulation results of residual stress were compared with the experimental results, which shows the accuracy of the simulation results. The results indicate that the distribution of residual stress is different in different laser scanning order. When the laser scanning order is from right to left,the distribution of residual stress is more uniform and the peak value of stress is smaller. At the same time, the change of the scanning order has little effect on the residual deformation of the joint structure. Therefore, the right-to-left scanning order is more favorable for the dual-channel laser joining of CFRTP/TC4 titanium alloy.