Hello vwjoegolf, Just a couple of things to add to js55's suggestions. You didn't mention the size of the filler wire that you are using for these beads that you are running. Consider this, when you are making a rod diameter selection, a given diameter of rod requires a minimum puddle size to properly melt the filler. If you are welding on the 11 Ga. material and using an oversize filler you will possibly end up burning through before you have enough heat to properly melt the filler. It may also stick or have a rough uneven bead profile. Heat sinks will probably help with the problem too. Try backing your 11 Ga. with a thick section of aluminum plate or if you've got lots of money, copper. This will also help to minimize the burnthrough by absorbing some of the excess heat. Just a few more thoughts to consider. Regards, aevald