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Correlation between plume fluctuation and keyhole dynamics during fiber laser keyhole welding
Journal of Laser Applications ( IF 2.1 ) Pub Date : 2020-05-01 , DOI: 10.2351/1.5138219
Min Li 1 , Rongshi Xiao 1 , Jianglin Zou 1 , Qiang Wu 1 , Jiejie Xu 1
Affiliation  

In order to reveal the fluctuation mechanism of the plume induced during fiber laser keyhole welding, dynamic behaviors of both the plume and the keyhole were simultaneously observed by using the multiple-imaging method. The results show that the fluctuation period of the plume was the same as that of the laser-induced vapor moving down on the keyhole front wall (KFW). The tilt angle of the plume was the largest when the laser-induced vapor was close to the orifice. As the laser-induced vapor moved toward the bottom of the KFW, the tilt angle of the plume decreased gradually. The correlation between the plume fluctuation and the dynamics of the laser-induced vapor on the KFW was not affected by parameters such as welding speed, laser power, and focal length. Further analysis shows that the periodic drilling behavior of the laser spot on the KFW is the main reason for the periodic fluctuation of the plume.In order to reveal the fluctuation mechanism of the plume induced during fiber laser keyhole welding, dynamic behaviors of both the plume and the keyhole were simultaneously observed by using the multiple-imaging method. The results show that the fluctuation period of the plume was the same as that of the laser-induced vapor moving down on the keyhole front wall (KFW). The tilt angle of the plume was the largest when the laser-induced vapor was close to the orifice. As the laser-induced vapor moved toward the bottom of the KFW, the tilt angle of the plume decreased gradually. The correlation between the plume fluctuation and the dynamics of the laser-induced vapor on the KFW was not affected by parameters such as welding speed, laser power, and focal length. Further analysis shows that the periodic drilling behavior of the laser spot on the KFW is the main reason for the periodic fluctuation of the plume.

中文翻译:

光纤激光小孔焊接过程中羽流波动与小孔动力学的相关性

为了揭示光纤激光小孔焊接过程中烟羽的波动机制,采用多成像方法同时观察烟羽和小孔的动力学行为。结果表明,羽流的波动周期与激光诱导蒸汽在锁孔前壁(KFW)上向下移动的波动周期相同。当激光诱导蒸汽靠近孔口时,羽流的倾斜角最大。随着激光诱导蒸汽向 KFW 底部移动,羽流的倾斜角逐渐减小。羽流波动与 KFW 上激光诱导蒸汽的动力学之间的相关性不受焊接速度、激光功率和焦距等参数的影响。进一步分析表明,KFW上激光光斑的周期性钻孔行为是造成羽流周期性波动的主要原因。并采用多重成像方法同时观察锁孔。结果表明,羽流的波动周期与激光诱导蒸汽在锁孔前壁(KFW)上向下移动的波动周期相同。当激光诱导蒸汽靠近孔口时,羽流的倾斜角最大。随着激光诱导蒸汽向 KFW 底部移动,羽流的倾斜角逐渐减小。羽流波动与 KFW 上激光诱导蒸汽的动力学之间的相关性不受焊接速度、激光功率和焦距等参数的影响。进一步分析表明,KFW上激光光斑的周期性钻孔行为是羽流周期性波动的主要原因。
更新日期:2020-05-01
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