Answer Happy

Problem 7 A 1.0 kW Co2 laser is used to cut a 4.5mmthick titanium alloy plate using an inert gas assist. The resulting cutting speed and kerf width are 3.0 m/min and 400_m, respectively. (a) Calculate the surface temperature at a point 4.0 mm behind the laser beam and 3.5 mm to one side, if the heat transfer efficiency is 90%, and the ambient temperature is 25°C. (b) Estimate the size of the heat-affected zone for this process if a cold rolled alloy recrystallizes at a temperature equal to half the absolute melting temperature of pure titanium. (c) Obtain the surface temperature for the point in (a) if oxygen assist was used, and 50% of the exothermic reaction contributed to the cutting process.