The solder stiffens the stranded wire into a single piece that is much
easier to break off with repeated flexing.

Carl Van Wormer, P.E., AE7GD
Senior Hardware Engineer
Cipher Systems
[log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Tuesday, May 31, 2011 10:24 AM
To: [log in to unmask]
Subject: [TN] Tinning Stranded Wire - Crimped Connections

Dear Technetters:

I have been posed a question I can't answer. In both the IPC-A-610 and
IPC-A-620 require that stranded wires used for crimp connections NOT be
pre-tinned with solder. Okay I get the requirement, but does anyone know
why this is a requirement. Pre-tinning keeps the strands together, so
there is some push-pack on why this is a requirement. Any thought
appreciated.

Gregg Owens


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