The Effect of Activated Flux in TIG Welding Process on the Quality of Weld Geometry of Austenitic Stainless Steel

Active flux welding (A-TIG) is a method that effectively enhances performance and improves penetration in TIG welding by applying a layer of activated flux to the workpiece before welding. The addition of flux results in higher temperatures in the welding arc, leading to increased penetration without the need for multiple passes and groove preparation, thereby significantly boosting productivity. This research explores the impact of various active fluxes (MoO3, Cr2O3, Fe2O3, Al2O3, and CaF2) in A-TIG welding on 6mm thick austenitic stainless steel 304L plates. The investigation focused on surface appearance, weld bead geometry quality, hardness, microstructure, and angular distortion. The findings revealed that utilizing A-TIG welding with Cr2O3, MoO3, and Fe2O3 fluxes notably improved the penetration depth and aspect ratio as well as reduced angular distortion compared to conventional (TIG) welding method. The application of fluxes had a minimal impact on the hardness and microstructure of A-TIG weld metal. Keywords: Activated fluxes (A-TIG), Weld Penetration, Angular distortion, Weld Bead Geometry