Nickel plated wire should not be used for solder cups. Period. For the very
reason you describe. Period. This is just my opinion of course. Nickel wire
is fine for crimped connections but (check the archives) Nickel does not work
well for soldering. The fluxes and cleaning methods for nickel are not very
compatible with stranded wire. I know of no method which will prevent liquids
from wicking under the insulation where it cannot be removed.

-----Original Message-----
From: - Bogert [mailto:[log in to unmask]]
Sent: Friday, April 09, 2004 5:39 PM
To: [log in to unmask]
Subject: [TN] Pretinning of nickel plated stranded wire


April 9, 2004

Folks, we have an OEM who is having trouble tinning nickel plated stranded
copper wire using ROLO or ROL1 flux per J-STD-004.  The OEM tried various
methods prior to tinning such as using stiff bristle acid brush using both
acetone and IP alcohol to try to clean the strands prior to tinning using
Sn96 solder.  The OEM also tried separating the strands, cleaning, then
re-twisting the strands back together.  Nothing the OEM tried provided
complete wetting/coverage of the strands.

The OEM wants to use Kester #2331-ZX flux then use warm water to clean off
the residue after tinning.  Using this flux the OEM was easily able to tin
the wire strands.  The flux is classified as ORH1.

Normally, my insight tells me that this type flux should not be used for
tinning stranded wires.  However, have you folks had any experience with this
flux?  Any suggestions on alternate flux that could be used to tin nickel
stranded wires would be appreciated.  If the Kester flux is used, is there an
adequate cleaning process that will provide assurance we will not have any
problems?  After the wires are tinned with Sn96 solder, they are inserted
into a connector solder cup and soldered using 
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ROL1 flux and Sn96 solder followed by solvent cleaning.

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