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Starting VPPA Welds Without Pilot HolesWelding current turned on gradually. Current increased gradually over short distance until full operating current reached, and welding proceeds in "keyhole" mode. Tests in laboratory and in production show gradual-turn-on technique 100 percent reliable.
Document ID
19880000450
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Mcgee, W. F. (Martin Marietta Corp.)
Date Acquired
August 13, 2013
Publication Date
September 1, 1988
Publication Information
Publication: NASA Tech Briefs
Volume: 12
Issue: 8
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
MFS-28268
Accession Number
88B10450
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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