218 B. El Aoud et al. Table 26.5 S/N response table for Kw[Ti-6Al-4 V] factor Level Pu (kW) V(mm/min) p(bar) 1 −54.87 −56.02 −55.50 2 −55.30 −55.17 −54.56 3 −54.07 −55.21 Delta 0.43 1.94 0.94 Table 26.6 S/N response table for kerf widthKw[Ti] factor Level Pu (kW) V(mm/min) p(bar) 1 −54.32 −55.15 −54.75 2 −55.06 −54.70 −54.26 3 −54.24 −55.07 Delta 0.74 0.91 0.81 Fig. 26.5 The graphic of mean of S/N ratios for kerf width Kw[Ti-6Al-4V] Fig. 26.6 The graphic of mean of S/N ratios for kerf width Kwof pure Titanium [Ti] larger different between value of S/N ratio will have a more significant effect on Kerf width size. According to Table 26.5, the first level of laser power, the third level of cutting speed and the second level of gas pressure are higher. Consequently, the optimum cutting conditions determined under the same conditions for the experiments to be conducted will be 2 kW for laser power, 2400 mm/min for cutting speed and 8 bars for gas pressure for Ti-6Al-4V. For pure Titanium the same results are showed, hence, the optimum cutting conditions determined will be 2 kW for laser power, 2400 mm/min for cutting speed and 8 bars for gas pressure (see Table 26.6).
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