The increasing demand in the industries of light-weight and strongest materials, especially in aviation, automotive and marine leads material engineers to turn their point of view into competitive materials. Aluminum and its alloys highly fulfill their interests, but the welding of this materials is challenging. direct drive friction welding stands out as a promising technology as it is capable of creating a joint between either similar or dissimilar materials that exhibits the parent metal strength without the necessity of filler metal and thus avoiding weight penalties. So, the main emphasis of this study is optimizing the process parameters of direct drive Friction Welding of 2024-T351 Aluminum alloy materials in order to improve tensile and torsional strength of the weld joints. Which have excellent properties and essential lightweight material in the transportation industry. The basic process parameters used for this study are friction pressure, forging pressure, spindle speed, faying/contact geometry and friction time. L18 orthogonal array of Taguchi design with grey relational analysis was used to optimize input process parameters of DDFW to increase tensile and torsional strength of AA2024-T351 weld joints. Tensile strength was measured using universal testing machine and torsional strength was measured by using bench top amounted torsional testing machine. The result show as friction pressure 30MPa, forging pressure 70MPa, spindle speed 2240 rpm, drilled-to-bossed contact geometry and friction time of 4 minutes are the optimum setting to get strongest weld joint. It is clearly seen at the optimum setting, the joint strength is greater than base metals tensile strength. The ANOVA result shows as forging pressure, contact geometry and friction pressures are the most significant parameters respectively.