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Summary
Friction stir welding is a novel welding process which is a solid state butt welding process for sheet or plate using the friction phenomenon.
This paper describes the effect of the rotation speed of the stir rod and the plate traverse speed during the friction stir welding process on the quality of welded joints. It was found that aluminium plates could be joined without defects by this process and that good joint properties were achieved using proper welding conditions for the rotation speed of the stir rod and the traverse speed. Hardness of the joint was reduced and its joint efficiency was 90% that of the base metals. Microstructures of friction stir welded joints were similar to those of friction welded ones, that is, fine grained structures.