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Milling machine is one of the conventional machine that capable of working on a flat surface, side cuting upright, leaning even the making of grooves and gear. This work on machine tools or finish a workpiece using milling knife (cutter) as chisel cut rotating on the axis of the machine. Welding is one of the important process in the manufacture of sample for industrial use. Friction stir welding one of welding techniques without welding medium. The welding process from this technique is obtained from the combination of heat and pressure due to friction between the spindle and the welding materials. Study on friction stir welding is carried out using a milling machine 3 axis with spindle as a tool for welding processes. The test materials Al and Mg alloy.The sample is positioned steady in sample holder, while the spindle spins welding instrument. Welding is carried out using the Y direction of the engine with a direct corner frais welding processes of 1o. Z-axis direction is used to immerse the spindle holder between two stir welding material to be in the welding, as for the direction of the X-axis is keep stable in its position. Spindle shaft dimension D = 25 mm, L = 100 mm spindle shaft, spindle las D = 5 L = 5, 4 mm. The speed of rotation of the engine use a two-speed variation, i.e 1450rpm and 180rpm. In this research, the result show that using 180rpm of the speed rotation engine with the feeding speed is 1,3 mm/min, and the temperature 55° C,is the optimum condition for welding of Al alloy by Mg, The welding surface look smooth without any cracks contour, as well as the level of its homogeneity of material both look almost reached a percentage of 50:50.