Charles

IMHO, it should be relatively easy to find an answer. What you don't
want is to solder a flex wire to either nickel or stainless steel, as
you will need a fairly active, halogenated flux and this will wick up
the flex, potentially causing corrosion problems at a future date. I
believe the safest way of handling this problem is to pretin the part of
the post where the flex is joined to, using a good, strong water-soluble
flux, which is an easy operation on most stainless alloys, then
thoroughly water wash the posts and then to assemble. You then solder
the flex with a pure rosin flux (or possibly a halide-free "no-clean"
one, with a slightly increased risk).

Brian

[log in to unmask] wrote:
>
> Here is my problem. One of them anyway. We have an assembly with a stainless
> steel pin that has a flex soldered to the end. Currently the pin is nickel
> plated. Due to some problem which has not been explained to me very clearly, it
> has been proposed to eliminate the nickel plate. My problem is obvious. How do I
> solder a little flex to the end of this stainless steel pin? This is a high
> dollar, high reliability assembly. ( Navy pilot wants this to work ) Any
> suggestions or advice are welcome. It may be posssible to have the pin plated
> only on the area that gets soldered but I am looking at the worst case because I
> have been around long enough to know that somebody who does not have to deal
> with a problem can always make it harder on those who do.
> Thanks in advance,
> Charles Caswell
> Process Lead, PCB
> Frontier Electronic Systems
>
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