Multi-Objective Parametric Optimization of Weld Strength of Metal Inert Gas Welding by using Analysis of Variance, Taguchi and VIKOR Techniques

Abstract

In Present research work is obtaining the optimal parametric combination for combined multi-response quality characteristics for MIG welding process parameters for AISI 1008 low carbon steel using VIKOR. Four input variables Current (I), Voltage (V), Wire Feed Rate (WFR), and Gas Flow Rate (GFR) are considered to evaluate their effect on three responses tensile, bending, and hardness on the elements of AISI 1008 low carbon steel material. Experiments were carried out as per Taguchi’s L9 OA. As the traditional Taguchi method is not adequate to solve multi responses problem, to solve this problem MCDM approach VIKOR analysis has been carried out for obtaining optimal parameters setting for multi-response optimization. No. of 3 specimens (for tensile, bending, and hardness) for each experimental run are fabricated for the measurement of respective strength and hardness. The analysis is done by following the steps of the VIKOR method, an optimal parameter setting for multi quality response is obtained corresponding to the lower VIKOR index value. The optimal parametric combination is found to be A1V1Gf1Wf1. After this analysis of the VIKOR index is carried out with S/N ratio Methodology for getting the most significant factors for optimal parametric combination for higher tensile, bending strength, and hardness from that Voltage is found to be the most significant parameter. Analysis of Variance is carried out to see the contribution of each parameter; it has been found that Voltage has the highest contribution for multi-response optimization.