Ok, I am working on my car and I thought I solved the problem by getting smaller wire (.025) for steel, but no. It actually has 2 problems. The main issue is that it WILL NOT penetrate the metal and it's only like 20 gauge sheet metal. All it does it stack and sputter. My metal is cleaned off too. I have tried setting the voltage to high, turned the wire speed from down to high, and no matter what, it won't do what it's supposed to. I know how to weld, but this thing just is not doing it. I am not using gas, but the wire is Lincoln Electric 75/25% because that's all the store had. The other problem is that it welds on it's own. All it takes is to just touch the metal and the wire burns up. Could these two be related? It's a Chicago Electric MIG 100-120v input welder, but buying another one is out of the question.