Ra μm ð Þ¼ 3:58þ0:0068 Power Wð Þ 0:000002 Power Wð Þ2 ð3:2Þ Ra μm ð Þ¼ 3:01þ13:94 Speed m=min ð Þ 8:72 Speed m=min ð Þ2 ð3:3Þ In the same way, an optimization of laser cutting process was made by software program and output parameters were obtained. These values were presented on the interaction plot for Ra values (Fig. 3.11) to see the effect of two basic parameters (power and cutting speed) at the same time on the graphic. Fig. 3.8 (a) 3D surface topographies for workpieces profile of surface cutting edge at a power of 2000 Watts and with a speed of 0.35 m/min, Sa ¼1.09μm. (b) 3D surface topographies for workpieces profile of surface cutting edge at a power of 2000 Watts and with a speed of 0.5 m/min, Sa ¼2.45 μm 3 Experimental Study of Laser Cutting Process of Titanium Aluminium (Ti-Al) Based Composites Designed Through. . . 29
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