hard solder

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Noun1.hard solder - solder that contains copper; melts at a relatively high temperature; used for brazing
solder - an alloy (usually of lead and tin) used when melted to join two metal surfaces
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Some old-timers call it "hard solder" as compared to the "soft solder" (lead/tin solder) which, until recent years, was used for most copper plumbing.