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.
Alternating-Polarity Arc Welding
NASA Tech Briefs ; 11 , 7
1987-07-01
Sonstige
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Englisch
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