gtbehary, I am still new to the whole welding game, but I was under the impression that it meant you could weld up to 3/16'' steel. I also had some similar rating on my MIG welder. To get to that higher thickness of steel you would probably want to use a thicker wire. Mine could be adjusted to use 2 different sizes by flipping a roller that the wire fed over to a bigger channel. I'm sure the thicker the tack you put on the metal the more it can hold. It just requires staying in one spot a little longer or increaseing the wire speed and moving slower.