NASA NTRS · 19870000367
Alternating-Polarity Arc Welding
Abstract
Brief reversing polarity of welding current greatly improves quality of welds. NASA technical memorandum recounts progress in art of variable-polarity plasma-arc (VPPA) welding, with emphasis on welding of aluminum-alloy tanks. VPPA welders offer important advantages over conventional single-polarity gas/tungsten arc welders.
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Schwinghamer, R. J.. 1987-07-01. Alternating-Polarity Arc Welding. https://ntrs.nasa.gov/citations/19870000367
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