Parametric Optimization of MIG Welding on IS 1079 HR 2 by Taguchi Method

The hot-rolled low-carbon (IS 1079 HR 2) steel is widely used material in automobile industry. Joining of metal for different parts is done by GMAW. Process parameter greatly affects the welded joint strength. This paper presents the case study to investigate the ongoing MIG welding process carried out by industrial firm in its welding protocol, by suggesting alternative effective method to achieve better strength with improved process parameters. These suggestions are achieved by investigating parameters like welding voltage, current, and shielding gas. Research is designed by Taguchi method to get required data and further analyzed by S/N ratio with interaction plot. The optimum process parameters 150 A, 30 V, and 25 L/min gas flow rate are suggested. This research also suggests that Taguchi method has successfully improved the existing welding protocol of the firm.