I have been having an issue lately that is starting to get on my nerves. When I am welding with my 350 p the arc gets to where it wants to back up into the tip. By backing up I mean my stickout disappears, it gets really loud and stops feeding because the wire melts in the tip. The other day I went though 6 tips in 6 minutes. Here are the details, welding old aluminum, cleaned with high speed ss wheel, and acetone. My settings are pulse, .030 4043 wire 18cfh, I usually keep about a 5/8ths stickout, 20 degree torch angle. It occurs after the weld has begun, maybe 1/2 inch into it after that initial start peak has subsided. The problem seems to be much more prevalent with older aluminum that has been painted or undercoated. I built a second story deck on a pontoon boat all with new aluminum and used only one tip. But I get a lot of aluminum boats and this arc issue is driving me nuts. I know most will say you are not cleaning well enough. I have been using this machine a long time and still find it finicky. A buddy keeps trying to convince me to switch to the .047 wire. I weld a lot of .080-.125 and think the .047 wire is too thick. I know it is not the machine but it is aggravating. I have the arc control set at 50, and I usually have the machine in the 200-215 range depending.
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