I am finding that my Sealey Supermig 185 is lacking the grunt I need to weld plate above 5mm or so, even with 0.8mm wire because it has a fairly low duty cycle at max power. Is there anything else I could get that will run on single phase that will weld up to 10mm? It doesn't have to be mig. Basically, what will weld the thickest steel on a single phase power supply?