This work focusses on optimizing the tungsten inert
gas welding parameters for welding AA6082 using multi-criteria
decision-making grey relation analysis. Main tungsten inert gas
welding parameters such as welding current, travel speed and arc
length are investigated for the effect on the geometry of weld such
as bead width, penetration, depth of heat affected zone and width of
heat affected zone. The results of grey relational analysis proved
that the optimum process parameters of the tungsten inert gas
welding of AA6082 pipelines were 105 Ampere, 10 mm/min welding
speed and 4 mm arc length. The least optimal parameters were 60
Ampere, 50 mm/min welding speed and 2 mm arc length. Factorial
analysis proved that main effects of current, arc length and welding
speed and interaction effects of current and welding speed have a
significant effect on the bead characteristics such as bead width,
penetration, depth and width of heat affected zone.