Results 91 to 100 of about 17,790 (213)

NASA Tech Briefs Index, 1977, volume 2, numbers 1-4 [PDF]

Announcements of new technology derived from the research and development activities of NASA are presented. Abstracts, and indexes for subject, personal author, originating center, and Tech Brief number are presented for ...

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Impact Welding in a Variety of Geometric Configurations [PDF]

, 2010
Magnetic pulse welding is an electromagnetically assisted high strain rate impact welding technology. The physical principle is similar to explosive welding and it also belongs to solid state impact welding.
Babu, S., Daehn, G. S., Zhang, Y.
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The variable polarity plasma arc welding process: Its application to the Space Shuttle external tank [PDF]

The technical history of the variable polarity plasma arc (VPPA) welding process being introduced as a partial replacement for the gas shielded tungsten arc process in assembly welding of the space shuttle external tank is described.
Bayless, O. E., Jr., Jones, C. S., III, Munafo, A. P., Nunes, A. C., Jr., Wilson, W. A.   +4 more
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Compact 20-kiloampere pulse-forming-network capacitor bank [PDF]

, 1973
Bank uses commercially available high-energy-density capacitors for energy storage and silicon-controlled rectifiers for switching. Low voltage design employing solid-state switching is utilized in lieu of conventional gas discharge ...
Michels, C. J., Posta, S. J.
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Research progress of solid-phase welding technology between magnesium and dissimilar metals

Journal of Materials Research and Technology
Solid-phase welding of magnesium with dissimilar metals leverages the advantages of multi-material systems, enhances design flexibility of components, and promotes equipment lightweighting.
Huan Liu, Wenxiu Fan, Ziyue Xu, Chao Sun, Yuna Wu, Jia Ju, Jiang Ma   +6 more
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Electrical termination techniques [PDF]

A technical review of high reliability electrical terminations for electronic equipment was made. Seven techniques were selected from this review for further investigation, experimental work, and preliminary testing.
Oakey, W. E., Schleicher, R. R.
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Electromagnetic propulsion test facility [PDF]

A test facility for the exploration of electromagnetic propulsion concept is described. The facility is designed to accommodate electromagnetic rail accelerators of various lengths (1 to 10 meters) and to provide accelerating energies of up to 240 ...
Gooder, S. T.
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The influence of pulse current on drop transfer during double-electrode gas surfacing

Frontier Materials & Technologies
The application of a circuit with a common pulse current source for surfacing with two electrode wires increases the energy efficiency of the arc process and the welding arc technological properties, but requires a more detailed study of the influence of
Sergey K. Elsukov, Ilya V. Zorin, Dmitry S. Nesin   +2 more
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Aeronautical Engineering: A continuing bibliography, supplement 120 [PDF]

This bibliography contains abstracts for 297 reports, articles, and other documents introduced into the NASA scientific and technical information system in February ...

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Influence of the Free Compression Stage on Magnetic Pulse Welding of Tubes [PDF]

, 2018
In magnetic pulse welding (MPW) of tubular parts, the acceleration of the ‘flyer’ part typically corresponds to a free electromagnetic compression (EMC) process over the distance of the initial standoff between the outer and inner tube.
Bellmann, J., Beyer, E., Gies, S., Lueg-Althoff, J., Schilling, B., Schulze, S., Tekkaya, A. E.   +6 more
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