I have a small Lincoln welder that I use for sheet metal. It welds flux or mig. I ran out of wire and since mig wire is less than half the price of flux I figgered I would get a tank and run the mig wire. It welded fine with the flux wire (.30) and since I switched wire (.25) It pops,snaps and wont weld for crap. I cant run a bead to save my life. Now the dang tank is empty. I only got the 20lbs tank but if you lined up all the beads I have tryed to run it wouldnt be 3 ft long. I have adjusted the wire tension,wire speed,heat range,changed ends,cleaned the gun. What gives ? Did I get a bad tank or what ? I'm going to take the tank back in the morning to see what they say. HELP if this is how its gonna be I can live with the not so pretty flux core welds.