Updated 05.05.2021
WELDING
SEMI-AUTOMATIC M.i.G
(GMAW)
Metal Inert Gas
M.A.G
(GMAW)
MIG/MAG is a semi-automatic welding process that uses the heat of an electric arc to heat the filler metal (cored wire or solid wire) to its melting point. The wire coming directly from the torch is melted and left on the workpiece in the shape of drops. MIG/MAG can be automated and is effective for intensive use, especially in industry.
Metal Active Gas
Process principle The electric arc is formed under gas protection between the wire and the part to be welded, resulting in their fusion. The wire is continuously fed to the arc through the reel mechanism and the torch The weld pool is protected from the outside air by the protective gas.
Nozzle Contact tube Wire Protection gas Arc Weld pool Welding parts
Applications
Boiler making
Structural steelwork
Automobile
ADVANTAGE S • Higher productivity than other processes (continuous wire feed)
• Welding standard materials • High deposition rate at high intensity and good penetration • Simple weld cleaning (no slag, except on some cored wires)
• Welding in all positions. • Automatable
Shipbuilding
General Industry
Nuclear
DISADVANTAGE S • Outdoor welding is difficult due to draughts • Requires gas protection (in most cases) • More expensive than the coated electrode process (MMA) • Less quality than the TIG process