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When you refer to a 200 amp welder you are talking about the output side of the welder. What you have to do is find out what the input voltage and current of the welder is to calculate the size of a generator needed to operate the welder.
Generators are rated in watts or kilowatts. The formula for watts is W = Amps x Volts. To size a generator for the welder the voltage of the machine must be stated.
Without the amperage the device uses this question can not be answered. The size of wire depends upon the amount of amperage a device draws. The voltage is independent of the size of the wire, it is an insulation factor. Most commonly used wire is rated at 300 volts.
20Amp
that depends on the size of the welder. some welders can be used with a 110V outlet and others need a 220V. the size of the welder is the decider on that. Tech Ed Ted
From the nameplate on the welder you find the amperage that the welder draws at the three phase voltage that you are going to use. This amperage is used to size the phase converter. This amperage is also used to size the breaker that will feed the phase converter and wire size for the installation.
# 6 wire
The 225 amps is the secondary output amperage. Look on the machines nameplate to find the input amperage. It is that amperage that is needed to size the feed wire and there the breaker size. When you find that amperage you may want to re question the breaker size.
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?
A #10 copper conductor with an insulation factor of 75 or 90 degrees C are both rated at 30 amps.
In order to weld pieces of 6mm steel you can use any type of welder. Depending on how strong and how pretty the weld needs to be will determine the type of welder you choose.
A #8 aluminium wire with an insulation factor of 90 degrees C is rated at 45 amps.