In this work, the Taguchi technique has been applied to optimize the welding parameters to detect the better mechanical attributes of friction stir welded AA6061, AA1050, AA5049, and AA5754 joints. L16 orthogonal array is used by considering the welding parameters, such as rotational speed, transverse speed, and tool pin profile. The best welding parameters for the greatest tensile strength and hardness of the joints were detected by studying the signal/noise (S/N) ratio and analysis of variance (ANOVA) results. The optimum levels for tensile strength were found to be 800 rpm rotational speed , materials 1050-H24 aluminum alloy, 25 mm/min transverse speed and pin profile is conical .Also, the optimal levels for hardness were found to be 600 rpm rotational speed, materials 1050-H24 aluminum alloy, 32 mm/min transverse speed and pin profile is conical . Besides, the fractured surface microstructure was examined of the friction stir welded joints.