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2. MIG/MAG WELDING (Metal Inert Gas / Metal Active Gas)
MIG / MAG (MIG - Metal Inert Gas and MAG - Metal Active
Gas) is an electric arc welding process
with shielding gas that uses wire that melts as it is fed.
The action of the gas can be none on the welding bath
(MIG - Metal Inert Gas) as is the case of Argon or react
with the bath (MAG - Metal Active Gas) as is the case
CO2.
WELDING METAL
Carbon steel
Stainless steel
Al Si (Aluminum/Silicon)
Al Mg (Aluminum/Magnesium)
CuSi (Copper/Silicon)
The mix Ar+CO2 increases more stability to the welding arc with low spatters and a better finishing of the
welding pool. There are other argon mixtures as helium or oxygen to increase more heat or more penetration for
specialized welding jobs. A consult to gas producers is advised.
DC current is used in this welding process and the MIG torch is generally connected to the positive pole.
The negative polarity is used in the welding of fluxed wires (without gas).
Recommended current table:
Wire diameter
0,8
0.9
1.0
1.2
1.6
Currently, the MIG/MAG process is applicable to the welding of most metals used in the industry such as steels,
aluminum, stainless steels, copper and several others. The workpieces with a thickness greater than 0.5 mm
can be welded by this process in practically all positions, which is why it is currently one of the most used
processes in construction welded from the smallest locksmiths to heavy industry.
Welding current
60 – 160 A
80 – 220 A
90 – 280 A
100 – 340 A
250 – 500 A
SHIELD GAS
100% CO2 (Carbon dioxide)
80% Ar (Argon) + 20% CO2
85% Ar +15% CO2
98% Ar + 2% CO2
95% Ar + 5% CO2
100% Ar
100% Ar
85% Ar + 15% He (Helium)
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