Influence of Magnesium on Spatter Behavior in Laser Deep Penetration Welding of Aluminum Alloys
Influence of Magnesium on Spatter Behavior in Laser Deep Penetration Welding of Aluminum Alloys
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DOI：
10.3390/jmmp3030071
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发表时间：
2019-08
影响因子：
3.2
通讯作者：
Andreas Felsing-;P. Woizeschke
中科院分区：
文献类型：
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作者：
Andreas Felsing-;P. Woizeschke
激光锁眼焊接过程中产生的飞溅对焊缝质量和后处理的必要性提出了挑战。在本研究中，研究了镁含量对Al99.5、AlMg3和AlMg5三种铝合金溅射行为的影响。利用同步双高速摄像系统观察溅射行为，重建三维溅射轨迹，确定溅射速度、飞行路径角度和近似溅射尺寸等特征。三种合金焊接实验的平均飞溅速度和飞行路径角分别在4.1 m/s ~ 4.6 m/s和44.8°~ 51.0°的焊接方向上。此外，AlMg合金表现出过度的飞溅行为，每次飞溅超过50个，飞溅爆炸的频率较低。喷溅事件表现出与喷溅爆炸相似的特征。体积蒸发被认为是影响这些事件的因素。相比之下，由于不同的机制，纯铝（Al99.5）显示出一次至少有10个飞溅的群体喷射事件。在这项研究中，溅射速度和飞行路径角度之间没有相关性，也没有溅射速度和近似溅射大小之间的相关性。
The quality of welds, as well as the necessity of post-processing, is challenged by spatter generation during the laser keyhole welding process. In this study, the influence of the magnesium content on spatter behavior is studied for three aluminum alloys (Al99.5, AlMg3, and AlMg5). A synchronized dual high-speed camera system is used to observe the spatter behavior and to reconstruct 3D spatter trajectories as well as determine the characteristics of spatter velocity, flight path angle, and approximate spatter size. The mean spatter velocities and flight path angles of the welding experiments with the three alloys were in welding direction between 4.1 m/s and 4.6 m/s and 44.8° and 51.0°, respectively. Furthermore, the AlMg alloys show excessive spatter behavior with spray events of more than 50 spatters at a time, and less frequently spatter explosions. Spatter spray events show a character similar to spatter explosions. Volumetric evaporation is proposed as effecting these events. In contrast, and resulting from a different mechanism, pure aluminum (Al99.5) shows group ejection events with at least 10 spatters at a time. In this study, there are no correlations between spatter velocities and flight path angles, nor between velocities and approximate spatter sizes.