Fluid-Dynamical Aspects of Laser-Metal Interaction,
R T M VICO CANAVESE TURIN (ITALY)
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During the interaction of a high-power laser beam with a material surface many fluid-dynamical phenomena arise. The produced flow field interacts with the beam and affects the thermal coupling between the laser energy and the target metal. In this paper the fluid-dynamical aspects of these phenomena are discussed and new experimental results are illustrated. The experiments have been performed in conditions of interest for industrial laser processes with a 15-kW CWC2 laser. The developing and the motion of bright clouds ignited from metal targets at incident laser power up to 11.6 kW, using an f18 focusing system, have been studied by high speed photographic records. The properties of the cloud have been examined by spectroscopic analysis and absorption measurements.