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Why should the end of copper enameled wire be burned when welding and dipped in alcohol immediately before welding? What's with alcohol therapy?
Copper forms CuO when it burns. CuO has a high melting point and cannot form a melt, so it is welded.

CuO can react with alcohol at high temperature and be reduced to Cu. The reaction is as follows.

2CuO+C2H5OH==CH3CHO+2Cu+H2O

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