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Failure analysis of blistered gold plating on spot welded electrical relaysGold-plated stainless-steel sideplates, part of a JPL Galileo spacecraft electronic-relay assembly, exhibited blistering after resistance spot welding. Unacceptable relays had heavy nonuniform gold electrodeposited layers with thicknesses 4.5-11.5 microns. SEM and metallographic investigations indicated much higher heat input generated during the resistance spot welding in unacceptable relays. The attributes of acceptable welded relays are contrasted with unacceptable relays; the possible mechanism of laminar formation of polymeric material in the gold plating is discussed; and some recommendations are provided to prevent similar problems.
Document ID
19890050541
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sokolowski, Witold
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
O'Donnell, Tim
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: SAMPE Quarterly
Volume: 20
ISSN: 0036-0821
Subject Category
Quality Assurance And Reliability
Accession Number
89A37912
Funding Number(s)
CONTRACT_GRANT: NAS7-918
Distribution Limits
Public
Copyright
Other

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