Not in my experience.
The best wire for CDW is 1xxx series wire, fortunately its also the cheapest aluminum wire. Its low melting point works to the CDW's advantage. Higher alloyed wire, like 5xxx or 6xxx series not only costs moe, it produces more weld spatter, I know because I've tried it. I've done my homework on the CDW. It works fine with 1xxx, 2xxx, 5xxx, 6xxx, and 7xxx series subject pieces (the work) again, because I've tried it. There are probably alloys it won't work properly with, but they would be exotic and not commonly encountered.
It takes a lot more than just a big capacitor and a power supply to make this thing work properly, it's not that simple. Recall that I am an EE with 30 years of circuit design experience, I do know what I'm doing (not to imply that you don't).
I'm glad you can see the practical utility of this device.
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