[wrenchnride247]

I run my MIG welder on #1 for amps and 20% on wire feed with .023 gauge wire for thin sheet metal. I have a Miller 135 welder. Make sure you have the right size tip in the gun for the wire size your running, and the pressure on the drive wheels that push the wire thru the cable. To check the wheel pressure put the tip of the gun on a piece of wood (so you don't arc off), and pull the trigger for a second. If the gun gets pushed up off the wood by the wire then your ok. If not, tighten the drive wheels and try again. Also some MIG welders have two different size groves on them for different size wire. You must have have a mix in your gas cylinder of 75% Argon and 25% CO2 for mild steel for MIG welding.


Make sure you have a good ground,and you have clean paint free and grease free spot you are welding. On the thin sheet metal you can't run a long bead or you will blow right through it, or warp it. You must do small quick tacks and space them out over the length of part. Then go back and fill the gaps, spacing the welds out again. This is how i've been welding thin sheet metal with my MIG welder for years. Hope this helps out.