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Submerged Pulsed Nd:Yag Laser Beam Cutting of Inconel 625 Superalloy: Experimental Investigation
N. Roy, A.S. Kuar1, S. Mitra and A. Das

Laser beam cutting of Inconel 625 superalloy with a Nd:YAG laser in a submerged condition has been studied here. The effect of the underwater laser beam cutting parameters such as lamp current, pulse frequency, pulse width, cutting speed, height of water column on Kerf width and depth of cut are investigated using response surface methodology (RSM). The developed mathematical models are tested by analysis of variance (ANOVA) method to check their adequacy. The central composite design (CCD) technique based on RSM is employed here to carry out the experiments to achieve optimum responses with a reduced number of experiments. From the ANOVA analysis it is found that pulse frequency is the most dominant factor. Height of water column has great impact on quality characteristics of the cut zone.

Keywords: Nd:YAG laser, Inconel 625, underwater laser cutting, response surface methodology (RSM), central composite design (CCD), submerged, kerf width, depth of cut

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