Conventional TIG welding is generally used for joining thinner materials due to its slower deposition rate, and the necessity for separate filler material which increases the expense and difficulty. Addressing these concerns, Activated TIG (A-TIG) welding is proposed as a solution, enhancing weld quality and efficiency on thicker plates. In this research, the technique of A-TIG welding is used to weld 6 mm thickness of 409L Stainless Steel plates. Different fluxes have been used, and their effects are examined on the resulting characteristics like surface appearance, angular distortion, depth of penetration (D.O.P), bead width, corrosion resistance, and arc constriction, respectively. These results were then compared with the ones of conventional TIG welding. It is observed that there is an overall improvement in weld depth, width, corrosion resistance, angular distortion, and arc heat transfer. However, surface appearance was found to be adversely affected to some extent in the case of certain fluxes. Examination of the various results further revealed that TiO2 flux exhibits the optimal values for almost all the desirable characteristics mentioned above except corrosion resistance. This experimental investigation concludes that out of all fluxes used in the present work, TiO2 is the one which can be recommended as the right flux for the material understudy in fabrication industries due to its favorable results.