| Summary: | Flux assisted tungsten inert gas welding (FATIG) welding is a modified version of tungsten inert gas (TIG) welding to achieve a higher depth of penetration. In the present work, nanoparticles SiO2, Al2O3, Fe2O3, and CuO mix with acetone and coated on the joint before welding. Bead on plate welding using different variants of FATIG welding performed on Hastelloy C-22. A comparative study of these variants called Activated tungsten inert gas (ATIG) and Flux bound tungsten inert gas (FBTIG) welding was conducted to find out their effects on depth of penetration, depth to width (D//W) ratio, surface appearance, and slag detachability. In addition, the influence of acidic and basic nature of flux on weld bead geometry and surface appearance are analyzed. Acidic fluxes produce a smoother weld surface than basic oxide fluxes; additionally, acidic flux slag is less sticky than basic flux slag. activated TIG (ATIG) welding with SiO2 flux increases penetration and D/W ratio by 125% and 190%, respectively compared to normal TIG welding.
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