I have noticed that many wires comming from China or bought on ebay is copper coated aluminum (if not some other thing that is not mentioned)
Ralph ku4pt
solderig enamelled wire, problems.
Jun 23, 2025
Last reply: 1 year ago
25 Replies
indeed. The windings of many microwave oven transformers are copper-coated aluminium.
Aluminium is cheaper than copper, but i doubt that copper coating .25 mm wire is cost effective. Aluminium with a few percent copper is a thing (in aviation), so the metals have an affinity. The Chinese are so advanced that they draw aluminium wire in vacuum - to avoid oxidation - and then run them -ma shang- through molten copper, to spare a few bucks on material?
[...]
Are you sure the black substance was carbon (Element 6, Kohlenstoff)? It might have been black copper oxide, which would not burn away at red heat.
Indeed. I thought that because it rejects solder.
Groetjes Albert
you can doubt but ...
that is not how it is made, google CCA wire
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