4043 aluminum welding wire has been extensively used for welding 6000 series aluminum alloys due to the good flow ability of the fusion state and low cracking tendency during welding process. Some scratches and wear on the surface of aluminum structural components can be repaired by surface welding with the 4043 aluminum welding wires. In the present study, the influence of Si content and aging temperature on the wear resistance property of the surfacing layers welded by tungsten inert gas (TIG) welding using the 4043 aluminum welding wires has been analyzed by optical microscopy, scanning electron microscopy, hardness testing and abrasive wear testing. The results showed that increase in Si content increased the fraction of eutectic Si particles. The heat treatment spheroidized eutectic Si particles and further improved the wear resistance property of the surfacing layers.