Tungsten Inert Gas (TIG) welding is a high quality welding process used to weld the thin metals and their alloy. 5083 Aluminium alloys play an important role in engineering and metallurgy field because of excellent corrosion properties, ease of fabrication and high specific strength with best combination of toughness and formability. TIG welding technique is one of the precise and fastest processes used in aerospace, ship and marine industries. TIG welding process is used to perform experiment and analyze the recorded data in the form of tables and figures. Evaluate the influence of input parameters on impact strength of 5083 Al-alloy specimens with dimensions of 55 mm long x 10 mm wide x 5 mm thick. Welding current (I), gas flow rate (G) and welding speed (S) are the input parameters which influence impact strength of 5083 Al-alloy welded joints. As welding speed increased, impact strength increases first till optimum value and after that decreases by increasing welding speed further. Results of the study show that maximum impact strength of 17.4 joule of weld joint are obtained at welding current of 240 Amps, gas flow rate of 7 Lt/min and welding speed of 98 mm/min. These values are the optimum values of input parameters which help to produce efficient weld joint that have good mechanical properties as a tensile strength.