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In the world of electronics......what is flux used for?? Answered

Do you put it on your soldering iron or on a wire?

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lemonie

Best Answer 6 years ago

It's like a detergent, it cleans metal so that solder adheres properly.

If you're doing lead-work with fluxless solder you may need it, otherwise most solder has flux cores.

L

I'm pretty sure flux is the stuff that's used in transformers, also motors and generators, for transferring electrical energy from one winding to another. Usually it's represented by a big Phi. (Φ) The SI unit for flux is the weber., where 1 weber = 1 tesla * m2.    Erm... here:
http://en.wikipedia.org/wiki/Magnetic_circuit

It's what fills the "Y" capacitor.

You get extra points for NOT telling him to use it as a jelly replacement in PB & J

Solder is a low-melting-point metal (or compound) that likes to bond with other metal surfaces.

Most metal surfaces react with oxygen and form a corrosion layer, or have minute amounts of grease/fingerprints/dust/etc on them that the solder WILL NOT readily stick to.

Flux in this case is like lemonie says - a detergent. It's a mild acid that dissolves a thin layer of the metal and oxides to leave brand new clean metal underneath for the solder to stick to. It makes soldering WAY easier, but is not 100% necessary.

"ELECTRONIC" solder usually contains its own flux, in tiny tubes (as many as 5) running down the middle.

When supplied as a separate chemical, its usually applied to the JOB, and soldered through. Its not usually necessary to use it for most work, but surface mount repair work benefits from its use.

Steve