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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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