If I want to minimize the amount of flux residues left
on the finished assemblies.

*Good luck.  I don't think you will find a specification that will tell you
what you want.  ROSE or SEC testing won't do it.  There are no accepted
standards for ion chromatography data. There is a visual assessment, such
as found in A-610, but that is highly subjective.  In addition, you may
have a low level of flux when averaged across the whole assembly surface,
but a high concentration in a local area, such as where you did touch up.

What specs. should I be concerned with when selecting the solder wire?

*Peter, the flux inside cored wire is the same paste flux qualified per
J-STD-004.  So you want a wire with a core flux qualified to J-STD-004.
Specify the alloy in the wire to J-STD-00 (5 or 6)

Currently we use Alpha metals No-clean Telecore P3.
Can someone please explain the influence of flux core
%?

*Core percent is just that, the percentage of flux in the core.  The larger
the diameter, generally the more flux you have.

Is there a documented reference for recommended flux
type for soldering wires?

*Use the same guidelines you use for selecting a regular flux.  The flux
manufacturers use the same flux composition, but add a binder agent to make
it a paste.

Doug Pauls
Rockwell Collins

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------