Friction stir welding tool

Details Friction stir welding tool Friction stir welding tool

1998-05-14

2000-04-25

Ryan, Patrick

Metal fusion bonding

Including means to provide heat by friction between...

2281121, 2988921, B23K 2012

Patent

active

060533919

ABSTRACT:
A stir weld tool of the present invention is used to weld two pieces of metal together through frictional heating, plasticizing, mixing, and forging of the plasticized metal into a uniform weldment. The stir weld is accomplished by rotating the stir weld tool with a pin having at least one boss on its surface to create the mechanical friction in the metal in contact with the rapidly rotating pin. As the rotating pin travels along the weld joint, the plasticized metal of the work pieces is extruded to the back face of the pin while undergoing a mechanical stirring and forging from action imparted by the at least one boss on the surface of the pin, and while confined from above by the pressure exerted on the metal by a shoulder on the stir weld tool.

REFERENCES:
patent: 3580459 (1971-05-01), Gage et al.
patent: 3777658 (1973-12-01), Vosskuhler
patent: 4131719 (1978-12-01), Nonoyama
patent: 5460317 (1995-10-01), Thomas et al.
patent: 5469617 (1995-11-01), Thomas et al.
Article "Production of Wide Aluminum Profiles by Solid-State Friction Stir Welding", by Midling and Johansen, May 1996.
Article"Fiction-Sir Welding Tool With Real-Time Adaptive Control", NASA Tech Briefs, Marshall Space Flight Center, Alabama, Feb. 1997.
Article Friction Stir Process Welds Aluminum Alloys:, Welding Journal, by Dawes and Thomas, Mar. 1996.
Article "Back-Surface Relief to Enhance Friction-Stir Welding", NASA Tech Briefs, Marshall Space Flight Center, Alabama, May 1997.
Article "Friction Stire Welding Shows Great Promise for Joining of DIfficult-to-Weld Materials", Welding Journal, Jun. 1997.

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