I am no expert (just a farmer) but for 5mm steel, you will not need 3 phase.
You might need a 15A power socket though, depending upon how many amps you go up to.
I've got a BOC. Not the cheapest but full supply of parts.
They weld much nicer than the old fashioned stick welders. The newer electronics seem to make it easier to strike and make an even bead than the old transformer type welders.


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