[QUOTE=Irelands child]You are right with the kinda dirty metal with no gas though I would still use MIG/gas combo on the fire wall. Gas (acetylene) welding puts way too much heat in the steel and causes a lot of warping - then you will be spending a bunch of time shrinking the metal plus hammer and dolly work. You can run .5 to 1.0 inch stitch welds with the MIG by going from one side, doing a couple of welds 4-6 inches apart then going to the other side.

(Don't forget to change the polarity when you switch to MIG w/argon)


Yeah, I will definitely use the mig/gas combo on the firewall. Direct Sheetmetal's instructions recommend welding through the 5/16" holes I drilled for removing the spot welds of the old firewall then doing the "stitch weld around the edges to finish it off, rotating from one side of the car to the other to minimize heat/warpage, etc.

I'm lovin this! How did I make it all these years without a welder?