Who says that halides are no longer our friends? Those who don't know
how to throw them out when they have outstayed their welcome! I'm no
longer in the business, but, if I were, I would judiciously use halogens
to flame-retard laminates, in tin/solder fluxes and maybe in solvents
and I'm damn sure the reliability of my products would not be
compromised in any way, compared to the results produced by my brethren
who shun everything in column VIIB.
It always used to tickle me when the great vogue in Germany was to use
DIN 8511 F-SW-32 (halide-free) fluxes and then to use chlorofluorocarbon
113 solvent in a vain attempt to remove the residues, leaving a visible
white residue of the acid activators. I have seen the lack of
reliability of such assemblies on many occasions and it was nothing to
do with the solvent containing three atoms each of fluorine and chlorine
in each molecule. It was much more to do "halogenidfrei" being a
buzzword in an industry that understood nothing that smacked of chemistry.
Brian
On 11/10/2011 23:33, Whittaker, Dewey (EHCOE) wrote:
> Instead of flux try scare tactics. Threaten to have Doug do the
> soldering. The wires will probably wet themselves.
> Back when Halides were our friends, I used a pre-tinning flux (Kester, I
> think) designed for silver finishes. It worked great.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Keith Calhoun
> Sent: Tuesday, October 11, 2011 12:56 PM
> To: [log in to unmask]
> Subject: [TN] Wire soldering question
>
>
> We are building a small assembly for one of our customers using
> M22759/12-24 wires, (nickel plated copper, Teflon insulated). We are
> using Multicore HMP solder, (Sn5, Pb93.5, Ag1.5) for this assembly.
>
> Do any of you have a recommendation for a flux that may help in getting
> this wire to wet? The other solder joints are acceptable, we just can't
> get the wire to wet. I know that I am trying something difficult, as
> soldering to nickel is difficult at best. I would be most greatful for
> any suggestions that anyone has for this.
>
> Thanks for the excellent resource!
>
> Keith S. Calhoun
> Manufacturing Engineering Manager
> SoPark Corporation
> 3300 South Park Avenue
> Buffalo. New York 14218
> Phone: 716-822-0434 ext. 237
> Fax: 716-822-5062
> [log in to unmask]
> Thank you for helping SoPark reach our 30th year as a Premier
> Electronics Manufacturing Service Provider!
> ISO 9001:2008& AS9100B Certified
>
>
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