The investigation of molten pool dynamic behaviors during the “∞” shaped oscillating laser welding of aluminum alloy

焊接 材料科学 熔池 激光束焊接 合金 气体保护金属极电弧焊 机械 激光器 冶金 多孔性 电阻焊 计算机模拟 复合材料 电弧焊 钨极气体保护焊 光学 物理
作者
Yuewei Ai,Yu Long,Huang Yi,Xiaoying Liu
出处
期刊:International Journal of Thermal Sciences [Elsevier]
卷期号:173: 107350-107350 被引量:69
标识
DOI:10.1016/j.ijthermalsci.2021.107350
摘要

To reduce the pore defect during the laser welding of aluminum alloy, a 3D numerical model is developed to study the dynamic behaviors characteristics of molten pool in the oscillating laser welding. The “∞” shaped oscillating laser welding process of 5052 aluminum alloy is calculated by the numerical model. The characteristics of morphology, temperature field, flow field of the molten pool are analyzed and discussed in details by the numerical calculation. The results show that the molten pool formed in the “∞” shaped oscillating laser welding is wide and shallow and the bottom part of the molten pool is flat. The complex fluid flowing characteristics induced by the formed vortexes are found in the molten pool. The influence of oscillating amplitude and frequency on “∞” shaped oscillating laser welding is also investigated. It is clearly seen that the maximum temperature and maximum flow velocity of the molten pool are decreased with the increase of oscillating amplitude or frequency and then the molten pool becomes more stable and shallower, which is benefit for the bubble escaping and weld porosity reduction. Therefore, the proposed numerical simulation method for the “∞” shaped oscillating laser welding is efficient for the weld porosity reduction and welding quality improvement in the laser welding of aluminum alloy.
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