My hobart 140 has 4 heat settings. On thin stuff I start out with 2 the heat and 30 on the wire speed. I practice on some junk similar to what I am welding to get the wire speed right. Something like floor panels I start out with 3/30 but If I burn holes I turn the heat down to 2. I think most machines come with Electrode Negative which is for flux core. If you are going to use shielding gas, you need electrode positive. I have seen people that didn't reverse their polarity to use mig. I just looked at the link to the welder you have. It looks like flux core only. I just looked at my Hobart book which surprises me that I still have. They recommend a heat gauge setting of 1 which is the lowest and wire speed of 30 on 18 gauge. They do not recommend welding anything lighter than 18 gauge with flux. This is the first time I have ever looked at charts, but looks to me that you may be trying to weld something thinner than what your machine was designed for.

Last edited by crenwelge; 11/12/2008 7:14 AM.