Aluminum Cable?

Demonic said

Strands look too coarse. The welding cable is very fine strand to increase it flexibility and current capacity - travels on the wire surface, so more surface = better current/less ohms.

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No, sorry, not correct. DC current does not exhibit "skin effect" that is higher frequency AC only, and gets worse as frequency goes up. That is , EG such things as higher freq HF or VHF and higher RF transmitter circuits use TUBING instead of wiring, and often silver plated at that

Also, the strand thickness has no bearing at DC, except maybe for vibration and installation flexibility.

Also it is debatable if welding cable is fine strand for "skin effect." It is fine mostly because it experiences LOTS of flexing with use, and would not physically hold up otherwise, and would also be "inconvenient" to use if very stiff

A "default" calculator for copper shows skin dept at 6hz to be about .33" so this means a conductor up to .66" has almost no effect at all