Treble it & add a bit! if you want to run a Portamig 211 from it Ray.
Welders consume a hell of a lot of power & you are into 5Kva just to run a small, 130amp MIG.
weldequip
on the farm in the southern cape we didn't have electricity, so every thing ran of gens.NOT WELDERS!!!!! thy kill gens. the power surge off the wed start and stop cause the gens windings to expand and settle which damage the isolation. the rest is simple rewind.