E7018 can be used on AC or DC. The reason you have trouble welding with it on your "buzzbox" type AC Welder, is because it has a very low OCV (open circuit voltage). Check it out on your NAMEPLATE.
If you would have a better AC welder with a higher OCV, it will work just fine.
The E7018 that is sold for use on an AC machine, is more expensive and contains more "arc stabilizers" in the coating. That is why this electrode works better on your AC machine.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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