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2. Flux (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Flux_(metallurgy)

   Rosin used as flux for soldering A flux pen used for electronics rework Multicore solder containing flux Wire freshly coated with solder, held above molten rosin flux. In metallurgy, a flux is a chemical reducing agent, flowing agent, or purifying agent. Fluxes may have more than one function at a time.

3. Solder - Wikipedia

   en.wikipedia.org/wiki/Solder

   In contrast to using traditional bars or coiled wires of all-metal solder and manually applying flux to the parts being joined, much hand soldering since the mid-20th century has used flux-core solder. This is manufactured as a coiled wire of solder, with one or more continuous bodies of inorganic acid or rosin flux embedded lengthwise inside it.

4. Borax - Wikipedia

   en.wikipedia.org/wiki/Borax

   Borax is also mixed with water as a flux when soldering jewelry metals such as gold or silver, where it allows the molten solder to wet the metal and flow evenly into the joint. [citation needed] Borax is also a good flux for "pre-tinning" tungsten with zinc, making the tungsten soft-solderable. [30] Borax is often used as a flux for forge ...

5. Soldering - Wikipedia

   en.wikipedia.org/wiki/Soldering

   Citric acid is an excellent water-soluble acid-type flux for copper and electronics [18] but must be washed off afterwards. Fluxes for soft solder are currently available in three basic formulations: Water-soluble fluxes – higher activity fluxes which can be removed with water after soldering (no VOCs required for removal).

6. Reflow soldering - Wikipedia

   en.wikipedia.org/wiki/Reflow_soldering

   Reflow soldering is a process in which a solder paste (a sticky mixture of powdered solder and flux) is used to temporarily attach anywhere from one to thousands of tiny electrical components to their contact pads, after which the entire assembly is subjected to controlled heat. The solder paste reflows in a molten state, creating permanent ...

7. Rosin - Wikipedia

   en.wikipedia.org/wiki/Rosin

   In industry, rosin is a flux used in soldering. The lead-tin solder commonly used in electronics has 1 to 2% rosin by weight as a flux core, helping the molten metal flow and making a better connection by reducing the refractory solid oxide layer formed at the surface back to metal. It is frequently seen as a burnt or clear residue around new ...