When I use mine I find it tends to work better on 1/2 power rating and a wire speed around 3.5-4 of 10. I think when its working right you should almost get a drop of weld constantly at the end of the wire that kind of drips in a controlled way onto the workpiece. I also keep the nozzle about 5mm away at a 45 degree angle and push the weld pool along so the gas keeps the pool shielded. To avoid blowing holes I was also told to just keep moving quickly along so to speak and not stay in one place for too long.
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