锁孔
材料科学
焊接
激光束焊接
熔池
渗透(战争)
计算机模拟
铝
激光器
焊缝
热影响区
合金
机械
复合材料
光学
电弧焊
钨极气体保护焊
工程类
物理
运筹学
作者
Dongsheng Wu,Xueming Hua,Lijin Huang,Zhao Jiang
标识
DOI:10.1016/j.optlastec.2017.10.010
摘要
The droplet escape condition in laser welding is established in this paper. A three-dimensional numerical model is developed to study the weld pool convection and spatter formation at full penetration during the fiber laser welding of 5083 aluminum alloy. It is found that when laser power is 9 kW, the bottom of the keyhole is dynamically opened and closed. When the bottom of the keyhole is closed, the molten metal at the bottom of the back keyhole wall flows upwards along the fusion line. When the bottom of the keyhole is opened, few spatters can be seen around the keyhole at the top surface, two flow patterns exists in the rear part of the keyhole: a portion of molten metal flows upwards along the fusion line, other portion of molten metal flows to the bottom of the keyhole, which promote the spatter formation at the bottom of the keyhole rear wall.
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