The influence of process parameters on the depth of substrate melting in the technology of laser metal deposition

Abstract

The dependences of the depth and width of the melt zone of the substrate on the scanning velocity, the distance from the nozzle to the substrate and the shift of the laser beam focus at different mass flow of powder in process of the track formation are obtained in the laser deposition technology using the 400 W laser with wavelength of 1.07 µm. It is shown that the width of the melt zone of the stainless substrate weakly depends on the focus shift and scanning velocity at the mass flow rate of less than 12 g/min. It narrows with increasing velocity at mass flow rate above 12 g/min. The depth of the melt zone increases with increasing intensity of the laser beam and decreases with growing mass flow. The depth is weakly dependent on the scanning velocity at flow rate of less than 15 g/min and decreases at a flow rate of more than 15 g/min with growing the scanning velocity under the condition of constancy of the radiation intensity. The obtained results allow to establish optimal values of technological parameters.