The Lincoln welder you showed doesn't have copper wiring, they never did according to Stan who e-mailed Lincoln asking that exact question. Even then, copper wires wouldn't make the welder weld differently. They might heat up easier over time but won't affect the welding enough you would notice a difference. The AC7018 make it easier but someone with a steady hand and the right brand of regular 7018 can weld it at the correct amps on a buzz box. A Lincoln buzz box is one of the easier AC machines to weld with as some machines are difficult to weld using 7018. The older Miller Thunderbolt's seem to have trouble holding a steady arc with regular 7018 in my experience. I didn't have too much of a problem with an early 80's AC225 Lincoln.
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