Definition of Mathematical Models of High-Alloyed Steel 1.4828 in CO2 Laser Cutting

This paper defines mathematical models of value changes for surface roughness (Ra, mu m) and heat affected zone width (HAZ, mm) during high-alloyed steel 1.4828 laser cutting using oxygen as an assistance gas. For the definition of appropriate mathematical models, multiple linear regression analysis is used, with four independent variables that were varied at five levels. Following parameters are varied: cutting speed (V), assist gas pressure (p), focus position (fs) and stand-off (N-d). In comparison between the model and the experimental results, it can be concluded that the effects of specified parameters on cut quality, productivity and thus the legitimacy of this technology for cutting high-alloyed steels are well described by the obtained mathematical models. (C) 2015 The Authors. Published by Elsevier Ltd.