I've never seen a single phase welder with a four-wire cord. Are you sure yours is not wired for three phase?
Find the make and model of your new welder, download the manual and figure exactly how it needs to be wired up. You may find a schematic inside the welder if you open it up. If so, take a picture and post that.
Re: So... How Do I Wire This Thing? in reply to MarkB_MI, 11-24-2012 16:46:50
I've seen single phase welders with the common 3 wire 230 plugs and also 4 wire plugs like a clothes dryer plug. I've also seen adapters where a 4 wire plug was converted to a 3 wire. A lot of inverters will run on multiple voltages and single or 3 phase. Maybe the 4th wire is only needed if hooking up to 3 phase power or running higher than 230 volts? I had a single phase 250 amp welder hooked up with a 3 wire plug but the school I went to had single phase welders with a 4 wire plug. The school probably used higher volts or only one leg of 3 phase power.
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