In the recent decades, the use of aluminum alloy has significantly enhanced especially in engineering applications extensively used in shipbuilding, aircraft, structural and automobile applications such as crankshaft, connecting rod and piston etc. This paper illustrates a comprehensive investigation on mechanical behavior of AA6061/Titanium diboride (TiB₂)/Silicon carbide (SiC) composites joined by friction stir welding using cylindrical pin tool profile. Various sets of metal matrix composites were prepared by varying TiB₂/SiC composition percentages in aluminum matrix using stir casting process. This process is followed by welding of samples by controlled input process parameters. Subsequently, microscopic analysis is performed on the various weld zones namely heat affected zone, thermo-mechanically affected zone and stir zone to observe the grain size and distribution of reinforcement ceramic particles in the matrix. Hardness and tensile tests are carried out to assess the strength of the weldment. Results emphasize that the ultimate tensile strength of the welded specimens is proportional to the weight percentage of TiB₂ in the matrix. The maximum hardness observed is 135.56 HV which is marginally greater than the aluminum matrix. Percentage elongation also increased by 2.5% thereby improving the weld specimen’s ductile property.