“GAUSS+半椭球”热源模拟激光焊接

“GAUSS+Semi-Ellipsoid”Heat Source Simulates Laser Welding

为了模拟7A52高强度铝合金激光焊接焊缝熔池轮廓形貌,根据7A52高强度铝合金的元素含量、物理性能建立材料文件;分析材料不同物态对激光的吸收和衍射,建立一种新型热源模型,命名为“GAUSS+半椭球”热源模型。施加“GAUSS+半椭球”热源、双椭球热源、三维高斯圆锥热源模拟焊缝截面形貌,提出以模拟与试验的焊缝截面面积之比为度量模拟准确率的方法。结果表明,“GAUSS+半椭球”热源模拟焊缝截面形貌的准确率为81.9%,其他热源的准确率分别是57%和73.6%。明确了新型复合热源模型能准确地模拟出缝截面熔池轮廓及温度场分布,模拟结果与试验结果吻合度高,有助于确定焊接工艺参数。

In order to simulate the weld pool profile of 7 A52 high strength aluminum alloy laser welding, material files were established according to the element content and physical properties of 7 A52 high strength aluminum alloy.A new heat source model named "GAUSS+Semi-ellipsoid" heat source model was established by analyzing the laser absorption and diffraction of different material states.The "GAUSS+semi-ellipsoidal" heat source, "Double Ellipsoidal" heat source and "Three-dimensional Gaussian Conical" heat source were applied to simulate the weld cross section topography.The simulation accuracy was measured by the ratio of the weld cross section area between the simulation and the test.The results show that the accuracy of "GAUSS+Semi-ellipsoid" heat source is 81.9%,and the accuracy of other heat sources is 57% and 73.6%.It is confirmed that the new composite heat source model can accurately simulate the weld pool profile and temperature field distribution of the seam section, and the simulation results are in good agreement with the test results, which is helpful to determine the welding process parameters.