Abstract This study shows that the keyhole model derived for determining the scaling laws of keyhole depths for laser welding when high power incident laser beams are used (typically in the multi-kW incident power range), can be also applied to determine the melted depths observed during the Selective Laser Melting process, where much lower incident powers of typically few hundred watts are focused on very small focal spots. The solution of the thermal analysis of this keyhole configuration is described by only three independent dimensionless parameters that are also involved for the analysis of a more general problem of heat conduction using similar input parameters. This global approach and the keyhole model describing the process of laser welding have been also validated by analyzing the melted depths generated by the Selective Laser Melting process. The dependence of the melted depths on the operating parameters of this process has been established, as well as the formation thresholds of the keyhole.

中文翻译：

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小孔模式下激光焊接过程的缩放规律

摘要 本研究表明，当使用高功率入射激光束（通常在数千瓦入射功率范围内）时，用于确定激光焊接小孔深度缩放规律的小孔模型也可用于确定观察到的熔化深度。在选择性激光熔化过程中，通常只有几百瓦的低得多的入射功率聚焦在非常小的焦点上。这种锁孔配置的热分析的解决方案仅由三个独立的无量纲参数描述，这些参数也涉及使用类似输入参数分析更一般的热传导问题。通过分析选择性激光熔化过程产生的熔化深度，这种全局方法和描述激光焊接过程的小孔模型也得到了验证。已确定熔化深度与该过程的操作参数以及钥匙孔的形成阈值的相关性。