Since no one has got this yet, I'll explain so ya'll will quit being dumb. The TJ tub sheetmetal has several surface prep coatings to reduce corrosion. One of those is a zinc based primer with a layer of normal primer over it. If that is not removed, then when the weld arc hits it, it blows a big hole in the sheet metal. So, if you want to weld up a tiny little hole, you need to remove all of the zinc coating, all of the primer and that is from both sides. Welds are flat or consistent in sheet metal so you also run the risk of grinding through the metal again when you get it smooth enough to not hold the bracket up off of the surface.
After that is done, now you have to stop both the inside and outside faces from rusting, do a primer, sand, coat, finish.
Your tiny little hole that can be fixed with a speed nut has now turned into a several hour job start to finish and it won't work any better than a simple nut on the back side.
Welding is the stupidest idea ever.