Analysis of the correlation between plasma plume and keyhole behavior in laser metal welding for the modeling of the keyhole geometry
Analysis of the correlation between plasma plume and keyhole behavior in laser metal welding for the modeling of the keyhole geometry
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DOI：
10.1016/j.optlaseng.2014.07.009
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发表时间：
2015
影响因子：
4.6
通讯作者：
F. Tenner;C. Brock;F. Klämpfl;Michael Schmidt
中科院分区：
文献类型：
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作者：
F. Tenner;C. Brock;F. Klämpfl;Michael Schmidt
激光金属焊接工艺在工业上有着广泛的应用。然而，目前仍缺乏对整个过程的理解和控制。为了分析这一过程，我们使用了两台高速摄像机。因此，我们可以在激光焊接过程中对等离子体羽流（可以通过相机直接获取）和锁孔（大多数过程不稳定发生的地方）进行等时成像。应用不同的图像处理步骤，我们能够找到这两个过程特征之间的相关性。此外，我们从两个方向对等离子体羽流进行了成像，并能够计算出等离子体羽流所携带的汽化物质的体积。由于这些相关性，我们能够从等离子体羽流成像中得出锁孔稳定性的结论，反之亦然。我们利用发现的锁孔行为与等离子体羽流之间的相关性来解释激光功率和进给速率变化对锁孔几何形状的影响。此外，我们试图勾勒出在进给量和激光功率的变化过程中对锁孔几何形状影响最大的现象。
The process of laser metal welding is widely used in industry. Nevertheless, there is still a lack of complete process understanding and control. For analyzing the process we used two high-speed cameras. Therefore, we could image the plasma plume (which is directly accessible by a camera) and the keyhole (where most of the process instabilities occur) during laser welding isochronously. Applying different image processing steps we were able to find a correlation between those two process characteristics. Additionally we imaged the plasma plume from two directions and were able to calculate a volume with respect to the vaporized material the plasma plume carries. Due to these correlations we are able to conclude the keyhole stability from imaging the plasma plume and vice versa. We used the found correlation between the keyhole behavior and the plasma plume to explain the effect of changing laser power and feed rate on the keyhole geometry. Furthermore, we tried to outline the phenomena which have the biggest effect on the keyhole geometry during changes of feed rate and laser power.