I would recommend against a flux core ... I bought a Hobart 125ez (i think it was). Unfortunately no matter what setting I used I constantly blew holes. I called Hobart support they had two suggestions. 1) attempt to stay 1/2"+ from your material or 2) Buy a MIG. I splurged and bought a Miller 140 MIG. Just this past weekend even with the MIG on its lowest setting I occasionally blew holes, Even with a piece of copper clamped behind the hole I was filling.
