soft solder

noun

a solder fusible at temperatures below 700°F (370°C), generally an alloy of lead and tin.

Origin of soft solder

First recorded in 1835–45

It has been enlarged with soft solder, as though Essex had only trusted it to a jeweller working in his presence.
Private Letters of Edward Gibbon (1753-1794) Volume 1 (of 2) | Edward Gibbon
The inside shell of this silver moulding is filled with soft solder, and then bent into the requisite form.
A Dictionary of Arts, Manufactures and Mines | Andrew Ure
With good soft solder, nearly all kinds of soldering can be done over a lamp without the use of a "copper."
Scientific American Supplement, No. 363, December 16, 1882 | Various
These, with others, are employed for soft solder joints, the temperature of which rarely exceeds about 600 Fah.
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 | Various
How to solder: soft solder is a mixture of tin and lead in even proportions.
The Library of Work and Play: Working in Metals | Charles Conrad Sleffel

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