Welding cables?

Hey guys,
I recently bought 2 multi-process Lincoln Idealarc DC600 welders from an auction. They didn’t come with the wire feeders or any cables. They were both wired in for 460V in a locomotive repair shop, using 2/0 cables. Since the wire feeders and factory replacement cables are so damn expensive, I’d like to at least be able to use one for some light duty (for it) stick welding. They’re honestly way too big for any of the projects I’d ever do, and I’ll only have them wired in at 240V.
Question, I have about 100’ of some nice 4AWG battery cable. How bad of an idea is it to make some welding cables out of it? About 20’ long?
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Are you sure you can even WIRE them for 240? Aren't they 3 phase? Do you have 3 phase power?