Friction stir welding (FSW) is a solid state joining technique that has expanded rapidly since its development and has found applications in a wide variety of industries. In the present investigation work, friction stir weldabilty of 5% SiC particulate aluminum matrix cast composite using TiAlN coated tool and effect of process parameters such as tool rotation speed, traverse speed, and axial force on ultimate tensile strength were investigated. The result showed that there was no noticeable tool wear, only aluminum particles were deposited on the tool pin. The effect of process parameters were evaluated using Anova and S/N ratio of robust design. It was observed that the axial force exhibits more influence on tensile strength followed by traverse speed and tool rotation speed.