I'm butt-welding SC flares onto my 73 this weekend. Little bit of practice yesterday.
Hobart 140, heat setting at 2, wire speed at 30, .023 wire.
I cut out of a section of old quarter and clamped it back in place. I'm getting more penetration than I think I should, weld bead came through the other side...or is that good? I ground the weld down with a cutting wheel on the grinder. To the left, you can see the seam. I will be sure to grind off the underseal of both the flares and the car before welding, this was just a quick test.
Should keep it at 2? After tacking both on, I plan on short beads "every now and again" to keep warping and filler to a minimum.