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Article | REF: BM7732 V2

Semi-automatic arc welding process

Author: Alexandre BENOIT

Publication date: October 10, 2015, Review date: March 10, 2021

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1. Features and applications of the MIG/MAG process

  • Description

    The semi-automatic process is an electric arc welding technique [B 7 730] . Called MIG/MAG (Metal Inert Gas/Metal Active Gas) or GMAW (Gas Metal Arc Welding) in English-speaking countries, its principle is based on the use of a fusible electrode. The electric arc generating the heat required for welding is established between the workpiece (anode) and the filler metal wire (cathode) fed by the torch. The wire unwinds continuously in the arc, and settles in a liquid state on the workpiece. MIG uses an inert shielding gas (argon, helium or a mixture of the two). This protective gas may contain so-called active gases (mainly CO 2 , O 2 , H ...

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