Burned a Hole

I had a Hobart 140 just like yours and was having same problem at the lowest setting. I borrowed my friends Lincoln 110 volt and it worked better on the thin material. I was building a lake for a guy and he was showing me his shop. He had a Lincoln Weld Pak 140 and said he wished he had bought 220 volt so I traded my new Hobart for his 110 volt. We were both happy. Since then I bought a Millermatic 211 which I love. Like said above short burst and you can fill the holes.