weld 22ga floor patches

[Roc]

I'm attempting to weld in some 22ga floor patches. I'm using a 135 mig with .023 wire and co2/argon mix. when I attempt to tack the patch I'm burning the patch away. I have the voltage turned all the way down and the speed at about 2 1/2 and I'm working in a overhead position. I would appreciate any tips or comments.
Thanks

[bababouy]

try using a backing plate, something other than the material you are welding. Try a piece of aluminumon on the back side of where you are welding. put a weight on it to hold it flat against your surface. This will take some of the heat out of your weld and allow you to weld without burning through.

[tjwelds]

Ceramic works really well as a backing plate too.

[Cgotto6]

How are you adding the patch? Overlaying or cutting and fitting? How large is the patch? Is any of the material rusted? I have done lots of welding on my friends 22g Sheetmetal on his car using .023 and 75/25. Fit up is very important. Gaps make life much harder. I was using my mm180.

[californiakid21]

Stitch weld it.

[MMW]

Fit up is very important on thin material. If your overlapping they need to be tight together. Use tacks instead of trying to run a bead. Tack about every 3/4" then fill in with more tacks. If butt welding you shouldn't have any gaps. Make the patch first then scribe around it & cut out the bad area.

As was mentioned already a backer of some sort helps a lot also. Aluminum or copper work well. Everything needs to be clean & solid. No half rusted areas.

[weldonwelding]

From what I gather your just laying over existing..? Start your tack on the existing metal and bring it to the metal that's burning away

[gnforge]

Yep. Agree with Weldonwelding, start your tack on base metal and or the thicker metal & flow into patch. Same with running bead

[tackit]

Why can't you use thicker steel for the patch?

[killdozerd11]

Using a flanger with the hole punch is great for panel replacement
You punch the holes and plug weld the replacement panel in place where you flanged the original metal it creates a lap joint that fits flush

But it does not work for all situations pics wold help