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In activated tungsten inert gas (A-TIG) welding, a thin layer of suitable activating flux is applied over the base metal to not only enhance penetration of the molten metal into root gap by 2 3 times compared to conventional TIG welding but also reduce the weld bead width considerably. This work focuses on examining the influence of TiO2, Fe2O3 and Cr2O3 activating fluxes (single component) on the weld bead geometry observed during the butt joining of 6 mm thick stainless steel (306 grade) plates by A-TIG welding under direct current straight polarity (DCSP). Three weld bead morphological parameters, namely, the depth of penetration, reinforcement and weld bead width, and their ratios are considered. The results are compared with those obtained during conventional TIG welding. The TiO2 and Fe2O3 fluxes exhibit the potential capabilities in enhancing penetration, reducing weld bead width, and reducing reinforcement. The Cr2O3 flux plays an insignificant role for redefining the weld bead shape, and in certain cases, this flux performs inferior compared to conventional TIG welding.

Effect of Polarity and Oxide Fluxes on Weld-bead Geometry in Activated Tungsten Inert Gas (A-TIG) Welding