Abstract
Friction Stir Welding ( FSW ) is a solid –state process that leads to several advantages over the fusion welding methods. This is used in the welding of several non-expendable and is also responsible for generating sufficient heat for welding and the resulting friction. Rotational speed, as well as the welding speed- both play a major role to obtain the weld quality. This research examines the effect of the rotation speed and welding speed on the tensile properties of the Al-Zn-Mg by the Minitab 16 program used. It was concluded that the best tensile strength of (158Mpa) can be obtained when the variables were (X1 = 900 rpm) (X2 =52mmmin).Also results show that the variables, namely the rotation Speed (X1) &welding speed (X2) have a significant effect on tensile strength. However, the interactions of these factors have less significant effect on tensile strength. Moreover, the tensile strength increases with the increasing welding speed and decreasing rotation speed
