Parametric Modeling of GTA Welding Process for Dissimilar Metals through Response Surface Methodology

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Abstract
The gas tungsten arc welding (GTAW) process is generally implemented for fusion welding of stainless steel, magnesium alloys, nickel base alloys, carbon steel and low alloy steels. This study deals with the parametric modeling of gas tungsten arc (GTA) welding process for two dissimilar metals specifically stainless steel and low carbon steel. There are several process parameters influences the quality of weld strength namely arc voltage, gas flow rate, torch distance, current and welding speed to be used. Among the various process parameters, the arc voltage, gas flow rate and torch distance were considered for this analysis with the response of tensile strength. Twenty experiments were performed as per response surface methodology (RSM) based central composite face centered design for GTAW process. Comparison studies were made for predicted and experimental values of tensile or weld strength by using analysis of variance (ANOVA). It was found that developed model statistically fit on 95% confidence level.