GMAW / MIG WELDING PROCESS

GMAW (USA) or MIG/MAG (EURO)

The meaning of "GMAW" is Gas Metal Arc Welding or "MIG" is Metal Inert Gas, or "MAG" Metal Active Gas

GTAW / TIG WELDING PROCESS

GTAW(USA) or TIG (EURO) PROCESS

The meaning of "GTAW" is Gas Tungsten Arc Welding, meanwhile the meaning of "TIG" is Tungsten Inert Gas

SMAW / MMA WELDING PROCESS

 SMAW (USA) or MMA (Euro) 

The meaning of "SMAW" is Shielded Metal Arc Welding, and "MMA" is Manual Metal Arc and is mostly used in Europe.