Ok, first explaining what soldering is:
Soldering (brazing) is taking a lower melting point metal (or alloy)
to flow and bond to a higher melting point metal(s) (alloy).
That can be copper base with tin/lead solder
all the way up to iron base and brass solder.
Solder flows and bonds to the surface of the other metal,
bridges/fills in the small gap and joins the surfaces.
Flux cleans the metal to be bonded so that there is
clean metal to metal contact. Impurities on the base
metal prevent that. It then has to get out of the
way to not in itself be an impurity.
So typically the flux flows onto the base metal first to
clean the metal before the solder melts and flows
onto the clean metal.
For the example of soldering copper pipe. The copper
is mechanically cleaned (sandpaper), the a flux is brushed
on. Only then is the torch lit, heat applied and solder
now melts and flows onto the copper. One hand for heat control,
one for solder
For electronic, flux in the middle, the flux flows out, cleans
and then allows solder to flow (it really doesn't take that much
flux).
The flux has to match the solder to be the right type of cleaning
to react well with the solder.
I hope that helps.
dave
On 11/14/13, 8:58 AM, wduke2@aol.com wrote:
>
>
> I am not understanding the liquid flux item. How can you do all three
> at once...apply flux, solder and heat? Will the solder with the flux in
> it work just as well? The flux doesn't have anything to do with the
> lead does it? Sorry to be so uninformed but even googling didn't answer
> my questions. Thanks.
> Joan O
>
--
Dave Uebele (daveu@sptddog.com)
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