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Davey1988
Sounds like you only have single phase wired upto your so called socket fella. Thats a 3 phase plug on the pic of the machine. Im guessing your welder if single phase if its a blue plug. Or could it be european and 2 phase. You need to give us more information. What socket have you got in your premisis.
take a pic of it,
take a pic of it,