A person or thing that causes flux or flow; in soldering and metallurgy, a substance or device that promotes the flow of molten metal.
From 'flux' (verb) + agent suffix '-er' (one who does). The term developed in technical trades like metalworking and plumbing where flux application is essential.
A fluxer can be either a person skilled at applying flux in delicate jewelry work or literally a robotic arm in factories that dispenses flux automatically—technology named after a medieval craft.
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