Abstract
This article presents research on the evaluation of the influence of various fiber laser parameters on the quality of the surface after the cutting process. The study was conducted using a 10 mm thick S355J2C+N steel sheet. The cutting process was performed on a Fiber Laser VFl530 cutting machine with a power of 4000 W, manufactured by Otinus. To develop a model of the laser cutting process, the response surface methodology (RSM) was applied. A second-degree polynomial equation was selected to construct the model. The study found that the parameter Rc exhibited a predicted coefficient of determination of 99.89% for the variance of laser settings in steel cutting, in relation to the roughness of the upper part of the intersection surface. The results demonstrated that the value of Rc is significantly influenced by cutting speed, the interaction between speed and peak power, the interaction between focus and speed, as well as the peak power parameter. Surface topography analysis revealed that as the laser beam power increased in relation to the cross-cutting speed, additional material melting occurred, leading to an increase in surface roughness. However, when the cross-cutting speed was increased while maintaining constant power, surface roughness decreased.