Numerical analysis of weld pool oscillation in laser welding

被引：0
作者：
Jungho Cho
Dave F. Farson
Kendall J. Hollis
John O. Milewski
机构：
[1] Chungbuk National University,School of Mechanical Engineering
[2] The Ohio State University,IWSE
[3] Los Alamos National Laboratory,undefined
来源：
Journal of Mechanical Science and Technology | 2015年 / 29卷
关键词：
Laser; Welding; Weld pool; Oscillation; Simulation; VOF (Volume of fluid);
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Volume of fluid (VOF) numerical simulation was used to investigate melt flow and volumetric oscillation of conduction-mode pulsed laser weld pools. The result is compared to high speed video stream of titanium laser spot welding experiment. The total simulation time is 10ms with the first 5 ms being heating and melting under constant laser irradiation and the remaining 5 ms corresponding to re-solidification of the weld pool. During the melting process, the liquid pool did not exhibit periodic oscillation but was continually depressed by the evaporation recoil pressure. After the laser pulse, the weld pool was excited into volumetric oscillation by the release of pressure on its surface and oscillation of the weld pool surface was analyzed. The simulation model suggested adjusting thermal diffusivity to match cooling rate and puddle diameter during solidification which is distinguishable from previous weld pool simulation. The frequency continuously increased from several thousand cycles per second to tens of thousands of cycles per second as the weld pool solidified and its diameter decreased. The result is the first trial of investigation of small weld pool oscillation in laser welding although there have been several reports about arc welding.
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页码：1715 / 1722
页数：7
相关论文
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