Parametric Optimization for Tensile Strength and Hardness of Mig Welded Joint of Dissimilar Metals using Taguchi Technique

Metal Inert Gas Welding (MIG) process is an important welding operation for joining ferrous and non-ferrous metals. The MIG input welding parameters are the most important factors affecting the quality of Welding. This paper presents the effect of welding parameters like welding voltage, gas flow rate and root gap on tensile strength and hardness of dissimilar metals during welding. A plan of experiments based on Taguchi technique has been plan the experiment, acquire the data and to optimize the welding parameters as well as the process. Design of experiments using orthogonal array is employed to develop the weldments. The input variables considered here include welding voltage, gas flow rate and root gap. A total number of 9 experiments runs were conducted using an L9 orthogonal array, and the ideal combination of controllable factor levels was determined for the tensile and hardness to calculate the signal-to-noise ratio. After collecting the data signal-to-noise (S/N) ratios were conducted and used in order to obtain optimum levels for every input parameter. Subsequently, using analysis of variance (ANOVA) the significant coefficients of each input parameter on tensile strength and Hardness were determined and validated.