Happy belated birthday. You will just need practice and you will get better on the welds. I have a Hobart Ironman 240 welder and weld exhaust all the time but mine is gas. The flux wire will burn hotter, the trick is to get the setting and wire speed correct and you can weld sheet metal. My first mig welder was a Century with flux wire which I used mainly on body panels. On thin metal you will have to make short bursts making sure to have a good puddle. With my old flux mig I had to use multiple tack welds to keep from burning through. Just takes a lot of practice to get better, the more you weld the better you will get. You might want to get a book on welding at a book store, the book will have a wealth of information and although it will not make an expert of you it will get you there quicker.
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