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The Plunge Phase of Friction Stir WeldingTorque and plunge force during the initial plunge phase in Friction Stir Welding were measured for a 0.5 inch diameter pin entering a 2219 aluminum alloy plate. Weld structures were preserved for metallographic observation by making emergency stops at various plunge depths. The plunging pin tool is seen to be surrounded by a very fine grained layer of recrystallized metal extending substantially below the bottom of the pin, implying a shear interface in the metal below and not at the tool-metal interface. Torque and plunge force during the initial plunge phase in Friction Stir Welding are calculated from a straight forward model based on a concept to plastic flow in the vicinity of the plunging tool compatible with structural observations. The concept: a disk of weld metal seized to and rotating with the bottom of the pin is squeezed out laterally by the plunge force and extruded upwards in a hollow cylinder around the tool. As the shear surface separating rotating disk from stationary weld metal engulfs fresh metal, the fresh metal is subjected to severe shear deformation, which results in its recrystallization. Encouraging agreement between computations and measured torque and plunge force is obtained.
Document ID
20050205846
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Nunes, Arthur
(NASA Marshall Space Flight Center Huntsville, AL, United States)
McClure, John
(Texas Univ. El Paso, TX, United States)
Avila, Ricardo
(Texas Univ. El Paso, TX, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Metals And Metallic Materials
Meeting Information
Meeting: Trends in Welding Conference
Location: Pine Mountain, GA
Country: United States
Start Date: May 16, 2005
Sponsors: American Society for Metals
Funding Number(s)
CONTRACT_GRANT: NNM04AA08G
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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