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Demonstration of a Large-Scale Tank Assembly via Circumferential Friction Stir WeldsA collaborative effort between NASA/Marshall Space Flight Center and the Michoud Unit of Lockheed Martin Space Systems Company was undertaken to demonstrate assembly of a large-scale aluminum tank using circumferential friction stir welds. The hardware used to complete this demonstration was fabricated as a study of near-net- shape technologies. The tooling used to complete this demonstration was originally designed for assembly of a tank using fusion weld processes. This presentation describes the modifications and additions that were made to the existing fusion welding tools required to accommodate circumferential friction stir welding, as well as the process used to assemble the tank. The tooling modifications include design, fabrication and installation of several components. The most significant components include a friction stir weld unit with adjustable pin length capabilities, a continuous internal anvil for 'open' circumferential welds, a continuous closeout anvil, clamping systems, an external reaction system and the control system required to conduct the friction stir welds and integrate the operation of the tool. The demonstration was intended as a development task. The experience gained during each circumferential weld was applied to improve subsequent welds. Both constant and tapered thickness 14-foot diameter circumferential welds were successfully demonstrated.
Document ID
20000070870
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Jones, Clyde S.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Adams, Glynn
(Lockheed Martin Michoud Space Systems New Orleans, LA United States)
Colligan, Kevin
(Lockheed Martin Michoud Space Systems New Orleans, LA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Mechanical Engineering
Meeting Information
Meeting: Aeromat
Location: Seattle, WA
Country: United States
Start Date: June 26, 2000
End Date: June 29, 2000
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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