Gas metal arc welding (GMAW) is a widely used fusion welding process. Such process is extensively used in joining various ferrous and nonferrous alloys. In the present investigation, an optimization of the GMAW process parameters was carried out using Taguchi’s optimization approach. This approach has been adopted to find out the optimum GMAW process parameters, typically, the welding voltage, wire diameter, wire feed rate and the CO2 gas flow rate that achieve the best ultimate tensile strength of mild steel welded joints. Optimizations results revealed that joints welded using welding voltage of 30 V, wire diameter of 1.2 mm, feed rate of 4 m/min and gas flow rate of 15 liter/min exhibited the highest ultimate tensile strength of 459 MPa