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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    Title :

    Alternating-Polarity Arc Welding


    Contributors:

    Published in:

    Publication date :

    1987-07-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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