Any welders on the board?

Like halfaed said going witth 023 would be easier for sheet metal. He is also correct on the method he is using to do sheet metal. You can spend the extra money and get a welder with a spot or stitch feature but that is all it is doing is cycling the output on and off, nothing you can't do yourself with the same or better results. The only thing about not running the correct size tip is that you may experience some erratic arcing. I have done way to many service calls on welders that people were complaining about poor welds that only needed a new tip or correct size tip in them. You have to remember that the tip is the main place the voltage transfer takes place for the wire. If not there you are relying on the liner (if its not a italian made welder with a plastic liner) to make that transfer of power. As for running the overhead welds, a little more voltage and a little less wire speed will get the job done nicely and give you a flatter weld. Just go at it in spurts so you don't burn through because the sheetmetal will get hotter quicker. A 75/25 co2/argon mix usually works the best with sheetmetal but if you are careful a straight co2 shielding gas will give you a deeper penetration
Carl
68 vert
St. louis