Why copper is not used for soldering?

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You can't use it because it has the same melting point as the pipe you are trying to seal. It just will not work. What you use has to have a lower melting point than what you are trying to weld or attach to.
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Why use flux when soldering copper tube?

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What would you use when soldering a lug onto a copper wire?

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What solder do you use on copper tubing for plumbing?

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