PREDICTING THE FUSION ZONE PROFILES OF INTERPULSE TIG WELDED NICKEL BASE SUPER ALLOYS
Keywords:
Interpulse TIG Welding, Nickel base alloy, Design of Experiment, ANOVAAbstract
Interpulse Tungsten Inert Gas (IPTIG) welding is a new variant of conventional Tungsten Inert Gas (TIG) welding process. This process offers many advantages over conventional TIG welding process such as narrow heat affected zone, deeper penetration. For welding titanium and nickel base alloy the IPTIG process were used by few researchers recently. The results are found to be interesting and comparable to electron beam welding. In this investigation, an attempt has been made to study the effect of IPTIG welding parameters on weld bead geometry of nickel based super alloy (Su-718) sheets. Four factors, five levels central composite design matrix was used to conduct the experiments. Bead geometries such as depth of penetration, width of bead and fusion zone area were recorded. Empirical relationships were developed to predict bead geometries incorporating IPTIG welding parameters. Perturbation plots were constructed to study the effect of IPTIG welding parameters on bead geometries.
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