Comparative study of Gas Metal and Arc Welding (GMAW) and Gas Tungsten Arc Welding (GTAW) for aluminium alloy 3003-H2 using Taguchi method
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) processes are an efficient economical means of welding of ferrous and non-ferrous materials. GMAW and GTAW processes have a great potential for application in precision welding of aluminium alloy 3003-H2. The published literature reveals that no systematic effort has been made to study the GMAW and GTAW processes in a comprehensive manner by considering all performance characteristics to predict the quality of weld. Realizing the potential and importance of the GMAW and GTAW processes for precision welding of aluminium alloy, the present work aims at investigating the effect of various processes parameters on the quality of weld in aluminium alloy. Experiments were carried out in a phased manner and the work was divided into three parts i.e. using GMAW, using GTAW and comparison of GMAW & GTAW. Comparative study of gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) for ultimate tensile strength, impact strength and hardness have been performed by Taguchi method. The control parameters viz. welding current, welding voltage, welding speed, gas flow rate and root gap were chosen as welding input parameters. The materials used for this purpose were aluminium alloys of grades 3003-H2 as parent material and ER4043 as filler material (wire) having dimensions (100x40x5 mm). Helium and argon were used as a shielding gas. Filler wire 4043 of diameter 1.6 mm was used. An orthogonal array, L27 was used to conduct the experiments. Signal to noise (S/N) ratio and analysis of variance (ANOVA) were employed to study the welding characteristics. Optimization of parameters was done by Taguchi method using statistical software MINITAB-18. Confirmation tests were carried out to validate the experimental results. Welding voltage for UTS, welding current for impact and welding current for hardness of GMAW were found to be most significant factors. Similarly, welding voltage for UTS, welding speed for impact strength and welding current for hardness of GTAW were found to be most significant factors.
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