The MIG welding machine actually has the characteristic of falling externally. It converts 220V and 380V AC into low-voltage direct current. Generally, the MIG welding machine can be divided into two types according to the type of output power supply, one is AC MIG welding machine; It is a DC MIG welding machine. The current conversion mode of the DC MIG welding machine is AC-DC-AC-DC. The MIG welding machine is composed of a power supply and a wire feeder. The shielding gas includes CO2, CO2 and argon mixed gas, and CO2 and helium mixed gas. do shielding gas.