Analysis of MIG Welding by Using Parametric Optimization Techniques Taguchi Method, Vikor Method and ANOVA

Abstract

Purpose of this 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, Voltage, Wire Feed Rate and Gas Flow Rate are considered to study their effect on three responses tensile, bending and hardness on the weldments of AISI 1008 low carbon steel material. Experiments were planned as per Taguchi’s L9 OA. As traditional Taguchi method is not adequate to solve multi responses problem, to overcome this limitation MCDM approach VIKOR analysis has been carried out for obtaining optimal parameters setting for multi-response optimization. Three specimens (for tensile, bending, and hardness) for each experimental run are fabricated for the measurement of respective strength and hardness. Investigation is done by following the steps of VIKOR method, and 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 VIKOR index is carried out with S/N ratio Methodology for getting most significant factors for optimal parametric combination for higher tensile, bending strength and hardness from that Voltage is found to be 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.