6061 aluminum pipe filled with alumina particle used for consumable rod and 5052 aluminum plate used for substrate, friction surfacing were done using a numerical controlled full automatic friction welding machine. Quantity of filling was changed by inner diameter with φ5, 7, 9, 10 mm. Effect of quantity of filling of alumina particle in a consumable rod on the dispersion characteristics of alumina particle in deposit were investigated. It was clearly observed that the circularly pattern appeared on the surface of deposit. Both length and thickness of deposit were decreased with increase of inner diameter, and the width of deposit became large. Surfacing efficiency showed 37–47%, and it was decreased with increasing of inner diameter. Alumina particle did not disperse in deposit uniformly, and it was distributed over the surface of deposit linearly. Alumina particle in deposit was become finer than before surfacing, and became small so as to reduce the inner diameter of rod. Hardness of the area that a lot of alumina particle was observed at the macro- and microstructures was higher than the other parts. Results of wear test by Ohogoshi-style wear tester showed good wear resistant in more than inner diameter at 9 mm.

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