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首页> 外文会议>Conference on Laser Materials Processing Vol.85f: Welding and Modeling, Nov 16-19, 1998, Orlando, FL USA >Melt Flow in Deep Penetration Welding
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Melt Flow in Deep Penetration Welding

机译：深熔焊中的熔体流动

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摘要

The roles of melt flow in determining the operating characteristics of deep penetration welding are described. The flow refers to the flow of the layer of molten metal lining the keyhole wall. As the workpiece moves in a direction transverse to the laser axis, the heat of the laser first melts a layer of the metal. Subsequent vaporization of a fraction of this metal creates a recoil pressure in the melt, propelling the molten metal around the hole, which eventually solidifies downstream of the keyhole. This mechanism requires only a fraction of the power, as compared to the power which would have been required if the keyhole had been formed entirely by evaporation. While the present theory is not intended to address the issue of plasma enhancement in keyhole formation, it is important to note that the presence of the plasma is not a necessary feature of the mechanism invoked. The theory clearly explains why keyhole formation is considerably easier in reduced pressures, and why high optical quality is of the primary importance.
机译：描述了熔体流动在确定深熔焊操作特性中的作用。流量是指锁孔壁内衬的熔融金属层的流量。当工件沿垂直于激光轴的方向移动时，激光的热量首先会熔化一层金属。随后一部分金属汽化会在熔体中产生反冲压力，将熔融金属推动到孔周围，最终在锁孔的下游凝固。与锁孔完全由蒸发形成的情况相比，该机构仅需要一部分功率。尽管本理论并非旨在解决匙孔形成过程中等离子体增强的问题，但重要的是要注意，等离子体的存在并不是所调用机制的必要特征。该理论清楚地解释了为什么在减压下更容易形成锁孔，以及为什么高光学质量是最重要的。

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