Welding galvanized metal= hazardous fumes. I just grind off the galv coating before welding.
Paul, are the rockers beyond repair? One suggestion is welding/brazing on some pull tabs, applying heat to the damaged area, and pulling the damage out.
I tried to pull some minor deformation out of my rockers using a stud gun and slide hammer, but it's thick metal....It'll need some heat to soften the metal.
I'll take a look at a floor section I have and see if the rockers are salvageable. I'd recommend used originals over hand-formed repro's anyday...