soldering flux

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Noun1.soldering flux - flux applied to surfaces that are to be joined by soldering; flux cleans the surfaces and results in a better bond
flux - a substance added to molten metals to bond with impurities that can then be readily removed
References in periodicals archive ?
The five day course covers the regulations for ground, air, and ocean shipping of hazardous materials like soldering flux.
Apart from high-performance batteries, lithium carbonate is used for soldering flux, in lubricants, focal lenses, and ceramics.
Apply soldering flux around the whole joint and apply heat with a torch until the old solder melts.