Experimental and Thermal Modeling of Multi Pulsa Laser Drilling Process

Abstract

In the present investigation, a 450 W Nd:YAG laser is used to study different parameters involved in the multi pulse laser drilling process. The laser unit is attached to a 3-axis CNC motion control system, which makes it flexible and suitable for experimental work. Studies were conducted to optimize the drilling process for multi pulse operation of the laser bearn. The cross sections of the holes were observed under scanning electron microscope (S.E.M.) and interferometric surface profiler (MicroXam). Also, a thennal model is developed for the multi pulse operation by using the moving disc heat source method. The model is compared with the experimental result . The experimental results and analytical solution show close agreement. The model is also compared with another analytical model, the Finite Difference Method model developed by Morita et al. It is clear from both the comparisons that the model gives agreeable results with practical conditions.