The wire feed welder is a MIG welder.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
The gauge of wire that is 12 volt is 18, 14, and 16.
16-gauge wire has a diameter of 0.05082 inches.
a stick welder needs to replace his electrode regularly and the flux coating is on the outside while a tig machine constantly feeds the wire and the flux is produced by a filler gas
#6 awg copper
The wire feed welder is a MIG welder.
You need to provide the voltage it operates at and the power it draws in watts.
It is very likely that the 120A current you quote is the output current. Check your Welder Box and look at the input current. It is likely around 30 Amps. To wire a 30A circuit you will need 10 gauge wire and it is likely 3 conductots + ground. You will need a 230V Breaker. Connect the black and red wires from the 10 gauge cable to the breaker, white wire to neutral and ground to ground.
It's not so much the duty cycle you have to worry about but the current draw, 8 gauge wire is more than sufficient to hold the current draw of your spot welder.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Wire gauges are defined in such a way that the lower the gauge, the thicker the wire. So, 8 gauge wire is thicker than 10 gauge wire.
#10
Yes, the smaller gauge number, the larger the wire is.
Yes, you splice a small length of 16 gauge wire to 18 gauge wire for a repair.
The larger the wire gauge, the smaller the diameter. 12 gauge is bigger than 14 gauge.
The wire size depends on the amperage, not the voltage. The fact that the welder runs on 440 volts does not affect the wire size! You need to ask this question instead: What size wire do you need for a three phase welder on an eight foot run if the nameplate amps are 45A?