Optimization of Machining Parameters in CW CO2 Laser Cutting for Reduced Kerf Angle and Surface Roughness

Abstract

Hot Rolled micro alloy steels (E34) find wide application in automotive sector. They are high quality steels having a blend of all the alluring properties that are not feasible in ordinary mild steel. These steels possess high yield strength, high notch toughness, good fatigue properties, excellent weld ability and better formability. E34 material finds application in construction of ships, railway wagons and carriages, pressure vessels, pipes, heavy duty transport vehicles, earth moving equipment and capacity tanks. The present study reports the application of non-contact type (thermal energy based) continuous wave (CW) CO2 laser cutting process on Hot Rolled micro alloy steels (E34). The process parameters in laser cutting influence the kerf angle and surface roughness. These quality characteristics were observed for the various combinations of cutting parameters like cutting speed, beam power, assist gas pressure, focal length and standoff distance. Experiments were designed using central composite design method of Response surface technology. A significant improvement in the kerf angle and surface roughness was observed with the optimal setting of parameters