Investigating the effect of laser cutting parameters on the cut quality of Inconel 625 using Response Surface Method (RSM)

Abstract Nickel-based superalloys have been widely used in the recent years due to their good strength and high-temperature resistance. These properties can also be affected during the cutting process. Therefore, one of the suitable methods for cutting this superalloy is laser cutting. In this study, the effects of parameters related to laser cutting were investigated and the quality of the cut was analyzed. The effects of these parameters on the surface roughness were also investigated. The response surface method (RSM) was then used to generate square models and 3D level diagrams. The results of the analysis of variance showed that the data were in a good agreement with the predicted nonlinear regression model. Among the main parameters, cutting speed, laser power and focal length had the greatest effect on the temperature around the cutting area, respectively. The lowest surface roughness was obtained at the highest power level of 1100 W and the lowest focal length of 4 mm. At cutting speed up to 8 m/min, the striation pattern was somewhat improved and the cut lines were straightened. The minimum roughness of the cutting-edge surface was obtained at the focal length distance of 0 mm.