WANG Chuancai, GAO Zuowen, QUAN Liwei.Construction and Simulation of Heat Source Composite Model for MIG Welding of T-shaped Thin Wall Aluminum Alloy[J].Electric Welding Machine, 2023, 53(1): 25-30.
WANG Chuancai, GAO Zuowen, QUAN Liwei.Construction and Simulation of Heat Source Composite Model for MIG Welding of T-shaped Thin Wall Aluminum Alloy[J].Electric Welding Machine, 2023, 53(1): 25-30. DOI: 10.7512/j.issn.1001-2303.2023.01.04.
Construction and Simulation of Heat Source Composite Model for MIG Welding of T-shaped Thin Wall Aluminum Alloy
Aiming at the problem of low accuracy of finite element simulation of welding deformation of thin-wall aluminum alloy, taking 2 mm profile T-joint of 6082-T6 aluminum alloy as the research object, the special heat source model of aluminum alloy MIG welding was studied by combining finite element simulation and actual sample checking. The morphology and deformation of weld pool of 2D Gaussian, double ellipsoid and 3D Gaussian are calculated. It is found that there is a gap between the size and deformation of molten pool calculated by the three typical heat source models and the actual sample. The heat flow of 2D Gaussian heat source is too small, and the width and depth of molten pool in the weld zone are significantly smaller than the actual molten pool size. The 3D Gauss heat source can reflect the effect of heat flow in the thickness direction, but the depth and width of the molten pool are slightly larger. The shape and width of the double ellipsoid heat source in the upper part of the pool are close to the actual ones, but the pool is shallow. Based on the characteristics of the three models, the optimized composite heat source model of "double ellipsoid +3D Gaussian" based on the typical heat source model is obtained by inverse calculation method. The weld pool size and offset are 90% consistent with the actual workpiece. The model is reliable and can be used for accurate simulation of MIG welding of thin-wall 6082 aluminum alloy T-joint.
关键词
薄壁铝合金有限元模拟热源模型偏移量熔池形貌
Keywords
thin-wall aluminum alloyfinite element simulationheat source modeloffsetmolten pool shape
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