WordReference Random House Unabridged Dictionary of American English © 2020
arc weld′ing, 
  • Metallurgy, Buildingwelding by means of the heat of an electric arc. Also called  electric arc welding. 
    • 1930–35

    Collins Concise English Dictionary © HarperCollins Publishers::
    arc welding n
    1. a technique in which metal is welded by heat generated by an electric arc struck between two electrodes or between one electrode and the metal workpiece

    arc welder n
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