Abstract:Friction and wear performances were investigated using gas tungsten arc welds and the friction stir welds of LF2 aluminum alloy, and three sorts of revolution speeds, e.g. 480, 1200, 2400 r/min were adopted. The result showed that the friction stir weld showed much better wear-resistance performance than the gas tungsten arc welds under the same condition. There was almost no difference of wear mass loss at 480 r/min. The wear mass loss of friction stir welds was about 4~6 times less that of the gas tungsten arc welds at the other two speeds. The morphologies of the surfaces of worn welds were observed, it was found that the surface of gas tungsten arc welds presented plough ditch and spalling, and the friction stir welds presented mild fatigue wear.