In present work, the optimization of mechanical properties of specimens accumulated by Wire Arc Additive Manufacturing (WAAM) process is done using Grey-based Taguchi method. ER4043 MIG wire of 1.2mm diameter specimen material and 6061 aluminumas substrate are selected for analysis. Initially, the specimens are fabricated by using Cold Metal Transfer (CMT) welding machine with a linear manipulatorby changing process parameters like Gas pressure, Current, Nozzle to tip distanceby following L9 Orthogonal Array (OA). Mechanical tests are conducted on specimens like, Micro tensile test and Micro Hardness test. From the output responses (test data)Grey-based Taguchi analyses and Grey based ANOVA test is performed.Finally, Maximization of Ultimate tensile strength (UTS) and Hardness of the WAAM specimens by Grey based Taguchi analysis and identified the percentage of contribution of each process parameters by using Grey based ANOVA.