In the present work an attempt has been made to optimize the process parameters of metal inert gas welding for aluminum pipes 6061 to evaluate the output quality characteristics using factorial design. An interaction effect of input parameters is also studied to predict their influence on the output response. The performance of MIG for aluminum pipe is evaluated in terms of joint’s tensile strength and corrosion rate , factorial design technique has been employed using orthogonal array, ANOVA (analysis of variance) to study contribution of each parameter and interaction of them on output and confirmation tests at 95 % confidence level to compare with experimental results. Optimal combination of parameters is presented with a good agreement found between the estimated and experimental results within the preferred significant level after verifying experimentally. It was confirmed that factorial design with ANOVA and confirmation tests successfully improved the quality characteristics of tensile strength and corrosion rate of MIG process.