hello,i have a murex tradesmig165 it welds very nice but dosent seem very powerfull? im using 0.8mm wire with argoshield heavy and on max settings and it wont burn through 2mm plate? ive used and older SIP 160 welder with the same gas and wire and it seem alot more powerfull and would easly do this, any ideals what could be rong with it? thanks ryan