In the present study, mechanical properties of friction-stir-welded pure Al with varying welding parameters, including rotating and welding speeds, were examined. Five-mm-thick pure Al plates were FSW with varying tool rotating speeds of 600, 800, and 1200 rpm, and welding speeds of 40, 60, 80 mm/min. Different tool pin profiles (three shapes) were developed to weld the Specimens and the effect of tool pin profile on the mechanical properties of the weld joints was studied.  Tensile test specimens were prepared with the tensile direction perpendicular to the welding direction, so that the weld zone was located in the middle of the specimen. The yield and ultimate tensile strengths were affected, by welding and rotational speeds but to a significantly less degree, with varying welding parameters. Low welding speed or high rotating speed tended to encourage the plastic flow per unit time and consequently the clustering of coarse precipitates. The hardness of the specimens was affected also by the different welding parameters. The effect of pin cross section on mechanical properties was analyzed and it was found that joints welded with straight cylinder pin cross section had better mechanical properties compared to the other pin cross sections .