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Assessment of Corona/Arcing Hazard for Electron Beam Welding in Space Shuttle Bay at LEO for ISWE: Test ResultsTest welds were made in argon over a range of pressures from 10-5 to 10-3 torr (the latter pressure an order of magnitude above pressures anticipated in the space shuttle bay during welding) with and without plasma on 304 stainless steel, 6Al-4V titanium, and 5456 aluminum in search of any possible unwanted electrical discharges. Only a faint steady glow of beam-excited atoms around the electron beam and sometimes extending out into the vacuum chamber was observed. No signs of current spiking or of any potentially dangerous electrical discharge were found.
Document ID
19970005301
Acquisition Source
Marshall Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Nunes, A. C., Jr. (NASA Marshall Space Flight Center Huntsville, AL United States)
Russell, C. (NASA Marshall Space Flight Center Huntsville, AL United States)
Vaughn, J. (NASA Marshall Space Flight Center Huntsville, AL United States)
Stocks, C. (NASA Marshall Space Flight Center Huntsville, AL United States)
ODell, D. (NASA Marshall Space Flight Center Huntsville, AL United States)
Bhat, B. (NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1996
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-TM-108525
NAS 1.15:108525
Accession Number
97N13227
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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