Maybe this will help.
Your wirefeed speed is your AMP control. Amps = Heat = penitration

Voltage controls the flow of current through the wire. You adjust your voltage to keep the current flow high enough to keep up with the rate your wire melts.

When you burn through your first instinct might be to turn up your wirefeed speed to add more metal. But all that will do is make you burn through more. turn your amps way down and adjust your voltage so your tip doesnt burn back to the electrode.


Oh and yeh. Fluxcore burns much hotter and needs much less amperage then hardwire. However, you can get duelshield and run flux with argon. It produces a very clean weld after you tap the slag off. But for sure the easyest form of mig welding is hardwire with an argon//co2 shielding gas.

As other people have said bodywork with .030 is about the biggest you want to go if your a good welder. .023 is better for sheetmetal bodywork. Also everytime you stop clip the end of the wire to knock the oxidized ball off. This will help starting your next bead and can help reducing your burnthrough.

also on extremly thin sections you can trigger weld. trigger welding you just tap the trigger for 1 or 2 seconds at a time then alow the zone to cool for a second and tap it again in a second or so. When this is dont in a steady pattern it alows the thin metal to cool and not get so hot that you burn through all the time.