Abstract
Stainless steel (SS) is an essential industrial and structural material that is challenging to be machined by conventional methods due to its very high melting temperature and the oxides that are formed. Still, as an alternate method, it can be machined by a laser. The primary objective of the current study is to optimize the CO2 laser beam cutting process parameters (viz. are (i) laser power, (ii) cutting speed, and (iii) gas pressure) on surface characteristics of machining 5 mm Stainless Steel (SS 314). Using Response Surface Methodology (RSM) optimization approach and the Box Behnken method, the process parameter of laser cutting were optimized while minimizing the surface roughness. RSM suggested a quadratic regression equation for surface roughness prediction in terms of process parameters. The optimum process parameters obtained are laser power = 1.2 kW, gas pressure = 0.579 bar, and the cutting speed = 2.4 m/min, which results in surface roughness of 2.132 µm.
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