Abstract

1. Formation of a Al−Cu-joint structure made by butting contact fusion welding occurs by a soldering mechanism, i.e., welding with development in the joint of hypereutectic alloy. 2. The structure of the transition zone of joints made by friction welding consists of a solid solution of copper in aluminum with a very small amount (∼1.5%) θ-phase which provides quite high strength properties for these joints.

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