On my Miller 210 I run the following as a generic starting point depending on thickness 2/25 ,3/35,4/45 and then I adjust as needed . I have found that the 3/35 works great for 3/16" to 1/4" material . For overhead I add little more voltage than I would normally use and a little more wire then move a little quicker than I would normally run a pattern . One thing I do a lot when I weld is reposition my project as I move to avoid welding overhead if possible . I can do it , but I dont like it . The pattern that works best for me on hard to reach areas is the push j . Most of my welds are lowercase e's if I can get braced up and have room to move .
When I get a new welder I weld on some scrap to feel it out and learn its settings . Hopefully my generic #s will get you started up and close to dialing in .
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