Tin coating bare wire ?

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PRR

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Commercial plating (much wire processing) requires "pickling" in STRONG acid to clean the base metal. Also a quantity of molten tin much larger than the wire in it at one time. If you run miles of wire the tin gets used; a home plater will have pounds of costly tin left over.

Another process (used for the first CopperWeld) is to plate the 1/4" BARS before going to the wire-draw mill. Wire-mills are costly; the story of electricity is in part the story of affordable mass wire.
 
This is available in the UK. Probably something similar is available in the USA
 

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I pull bare wire through a new non metallic scouring pad to get impurities and oils off then on a ceramic tile I tin it with a very hot iron. Once you get the hang of it you can do it easily. You feed solder as you pull the wire under the iron making sure it flows. You can get it very thin or thick depending on heat and speed.