The goal of the optimization process is to
determine the near optimal laser cutting
parameter values (vopt, Popt and popt) in order to
ensure the maximum value of S/N subject to the
condition that the Ra is bellow 1.6 µm, which
satisfies the real requirement in practice. For
CO2 laser cutting of structural steel S355J2G3 EN
10025 sheet, dual response optimization
problem can be formulated as follows