They have both.
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You can determine if a transformer has copper or aluminum windings by looking for any markings or labels on the transformer, as manufacturers often indicate the material used. You can also do a visual inspection - copper windings typically have a distinct reddish color, while aluminum windings are lighter in color. Lastly, you can use a magnet to test the windings - copper is not magnetic while aluminum is.
# 8 RW90
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Gunmetal is typically composed of copper, tin, and sometimes other elements like zinc or lead. The composition can vary depending on the specific application, but the general ratio is around 88-90% copper, 10-12% tin, and trace amounts of other elements.
You can use a process called friction welding to join copper and aluminum pipes. Friction welding involves generating heat through friction between two materials and then applying pressure to create a bond. This method is effective for welding dissimilar metals like copper and aluminum.
You can buy an auto transformer with 0-120-240 volt output at electrical supply stores, online retailers such as Amazon or eBay, or specialty electronics stores. Make sure to verify that the transformer meets your specific voltage and power requirements before purchasing.