Some welders have a chart on the inside of the door where the wire spool is. 120/110 volt welds can give you a hard time until you have it figured out. Best bet would be like others have said already get some scraps of what you are welding on and play with the different settings
![Flamer :flamer:](https://board.marlincrawler.com/Smileys/marlin/flamer.gif)
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Jason