Experimental investigation of hydrodynamics of melt layer during laser cutting of steel
Experimental investigation of hydrodynamics of melt layer during laser cutting of steel
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DOI：
10.1088/0022-3727/44/10/105502
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发表时间：
2011-03-16
影响因子：
3.4
通讯作者：
Fabbro, Remy
中科院分区：
文献类型：
--
作者：
Hirano, Koji;Fabbro, Remy
在激光切割过程中，了解熔化层的流体动力学是非常重要的，因为它是控制最终质量的重要因素。在这项工作中，我们观察到的情况下，激光切割的钢与惰性气体的切口前沿的熔体层的流体动力学。观察结果表明，熔体流动的切口前沿表现出强烈的不稳定性，取决于切割速度。在中等速度范围内，切缝前缘中心部分的流动是连续的，而沿沿着的流动是不连续的。首次证实了侧流的不稳定性是切缝顶部产生条纹的原因。的不稳定性的起源进行了讨论，在热动力学和流体动力学的不稳定性。该模型与实验结果吻合较好。
In a laser cutting process, understanding of the hydrodynamics of melt layer is significant, because it is an important factor which controls the final quality. In this work, we observed the hydrodynamics of melt layer on a kerf front in the case of laser cutting of steel with an inert gas. The observation shows that the melt flow on the kerf front exhibits strong instability, depending on cutting velocity. In the intermediate range of velocities, the flow on the central part of the kerf front is continuous, whereas the flow along the sides is discontinuous. It is first confirmed that the instability in the side flow is the cause of striation initiation from the top part of the kerf. The origin of the instability is discussed in terms of instabilities in thermal dynamics and hydrodynamics. The proposed model shows reasonable agreement with experimental results.