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Actually Copper and aluminum, whats the purpose of your question....
Unlike alot of people, I am generally not afraid of buying used equipment, especially something as robust and simple as a transformer based arc welder. I fact, I find that alot of times, the older equipment is built better than the new. I am wondering if this is the case here as well, when comparing the older thunderbolt design (ac/dc with the top handle) to the current thunderbolt XL. I know that aluminum will conduct the electricity just fine, but I believe copper is better for these machine. Just wondering what the Thunderbolt AC/DC's had inside? sounds like both copper and aluminum?
Unsure what all the hub bub is with Aluminum and copper anyways. Aluminum conducts WAAAAYYYY better than copper.
Sorry, electrical resistance is lower in copper, so copper is a better conductor as far as the base metal goes. But you may be correct in that a final design using Aluminum may be better than Copper when you factor in wire gauge used, etc. for cost/weight reasons...
So out of curiosity, what is copper and what is Al in my machine?
I asked a Miller tech about this issue once and he said aluminum was actually better than copper in some respects for some components in a transformer welder (and not just cost). I can't remember why it was better...maybe different coefficients of expansion? or different increases in electrical resistivity for a given increase in temperature...? I forget...maybe a Miller tech will chime in here...