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What is the use of FLUX when we solder?

Discussion in 'Electronic Basics' started by WAZ, Aug 22, 2006.

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  1. WAZ

    WAZ Guest

    What is the use of FLUX when we solder?
  2. Eeyore

    Eeyore Guest

    To remove oxides / sulphides etc from the surfaces being soldered.

  3. It combines with the surface oxide and excludes atmospheric oxygen
    from making more oxide.

    This allows the liquid metal (solder) to contact solid metal without
    oxides being between them, which would inhibit their forming a thin
    intermetalic layer that connects them together.
  4. Don Bruder

    Don Bruder Guest

    Cleans the base metal(s) of the joint, both physically (floats crud
    away) and chemically (eats various things that would keep the solder
    form sticking), and prevents post-cleaning formation of an oxide layer
    that would keep the solder from sticking.
  5. Bob Myers

    Bob Myers Guest

    And most importantly, it gives you that wonderful
    "I'VE been SOLDERING!" scent.....:)

    Bob M.
  6. Don Bruder

    Don Bruder Guest

    <heh> Yeah, there is that factor, now that you mention it :)
  7. Puckdropper

    Puckdropper Guest

    IME, it has a tendency to warm parts through faster so you have to apply
    the soldering iron for less time to make a joint. It seems I sometimes
    get better joints when I use flux. (I'm not doing PC boards here, it's
    soldering wires to model railroad rail.)

    It's also useful for "recharging" desoldering braid.

  8. Eeyore

    Eeyore Guest

    That's because it aids the 'wetting' of the components that in turn leads to
    better thermal transfer.

  9. Guest

    Don't notice that at all with a Metcal.

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