just wondering if any one can give me a good explanation. occasionally I weld aluminum (mig) with a hobart handler 135 argon gas. I do have feeding problems from time to time. but. If I start out, every thing is clean ( welder ) I get expected welds from135 amps max power setting wire speed 90. the wire melts off at 1/4 stick out, but after welding for a few mins the arc starts to burn back and melt the wire right at the tip. and you hear a real soft arc noise, a wire jam is only seconds away at this point. is this heat related ? or build up with in the nozzle .
I know the welder is not the way to go, I have a 300 amp powcon I want to buy a spool gun for.