Heat treating friction stir welded aluminum alloy members...

Metal fusion bonding – Process – Using dynamic frictional energy

Reexamination Certificate

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C228S002100

Reexamination Certificate

active

07810700

ABSTRACT:
A method of joining aluminum alloy members, including the steps of: obtaining a joined body including: (a) contacting aluminum alloy members each made of a 6000 series aluminum alloy with T4 temper; and (b) performing a friction stir welding operation on a contact portion of the aluminum alloy members at which they are held in contact with each other, so as to form a stir zone at the contact portion; and performing, on the obtained joined body, an underaging treatment which is an artificial aging treatment and which is completed before hardness of the stir zone reaches maximum hardness, the underaging treatment being performed before GP zones are formed at the stir zone of the joined body.

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