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The Establishment of a New Friction Stir Welding Process Development Facility at NASA/MSFC
The primary objective of full scale development is to mitigate scale-up issues before the vehicle ever reaches production and verify assembly design models. Only at full scale can the true challenges associated with production be identified and dealt with. Also, only at full scale can the delta shift between lab and subscale hardware manufacture and assembly be assessed.
The Establishment of a New Friction Stir Welding Process Development Facility at NASA/MSFC
No abstract available
Friction Stir Welding of Additively Manufactured Aluminum Alloys
No abstract available
Influence of Tool Thread Pitch During Friction Stir Welding of High-Density Polyethylene Plate
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Internal Friction Reduction Pin Tool for Friction Stir Welding
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The Effect of Dispersoid Modification on Abnormal Grain Growth in Friction Stir Welded Al-Li 2195
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Characterization of Al Parts Fabricated by Additive Friction Stir (AFS) Manufacturing
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Improved Durability Reusable Launch Vehicle via Friction Stir Welding
This project goal is to develop joining processes that will enable manufacturing of damage tolerant structures for improved durability launch vehicles.
Internal Friction Reduction Tool (For Self-Reacting Friction Stir Welding)
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A Formal Approach for Verification and Validation for Simulations of PAUT of Friction Stir Welds in CIVA
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Nondestructive Evaluation Simulation of Friction Stir Welds
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Improved Durability Reusable Launch Vehicle via Friction Stir Welding
Improved damage tolerant structures are being manufactures using solid state joining methods technologies.
Friction Stir Welding Controls Using Machine Learning
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Welding Development: Marshall Space Flight Center
This paper presents the basic understanding of the friction stir welding process. It covers process description, pin tool operation and materials, metal flow theory, mechanical properties, and materials welded using the process. It also discusses the thermal stir welding process and the differences between thermal stir and friction stir welding. MSFC weld tools used for development are also presented.
Development of Weld Inspection of the Ares I Crew Launch Vehicle Upper Stage
NASA is designing a new crewed launch vehicle called Ares I to replace the Space Shuttle after its scheduled retirement in 2010. This new launch vehicle will build on the Shuttle technology in many ways including using a first stage based upon the Space Shuttle Solid Rocket Booster, advanced aluminum alloys for the second stage tanks, and friction stir welding to assemble the second stage. Friction stir welding uses a spinning pin that is inserted in the joint between two panels that are to be welded. The pin mechanically mixes the metal together below the melting temperature to form the weld. Friction stir welding allows high strength joints in metals that would otherwise lose much of their strength as they are melted during the fusion welding process. One significant change from the Space Shuttle that impacts NDE is the implementation of self-reacting friction stir welding for non-linear welds on the primary metallic structure. The self-reacting technique differs from the conventional technique because the load of the pin tool pressing down on the metal being joined is reacted by a nut on the end of the tool rather than an anvil behind the part. No spacecraft has ever flown with a self-reacting friction stir weld, so this is a major advancement in the manufacturing process, bringing with it a whole new set of challenges for NDE to overcome. The metal microstructure and possible defects are different from other weld processes. Friction plug welds will be used to close out the hole remaining in the radial welds when friction stir welded. This plug welding also has unique challenges in inspection. The current state of development of these inspections will be presented, along with other information pertinent to NDE of the Ares I.