Hi,

 I would think you need to strip the Litz pror to crimping. The stripping is
accomplished, I assume, in the tinning process. 

 If you are tinning and stripping in one fell swoop in a solder pot then the
Litz would come out as a rigid piece, not the best candidate for crimping
into a terminal.

So I probably missed something but how are you stripping the Litz?
Chemically? How many fine strands are we talking?

Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Nutting, Phil
Sent: Thursday, October 22, 2015 4:30 PM
To: [log in to unmask]
Subject: [TN] to solder or not to solder Litz wire in crimp lug

Esteemed colleagues,

For our high voltage transformers, many are wound with Litz wire (see links
below for more info).  To make an electrical connection we tin the wire ends
in a solder pot.  From there the tinned wire may be inserted and soldered
into a circuit board or a ring lug is crimped onto the tinned end.

So here is the "discussion" within our group.  I have fought (and won) to
eliminate crimping and tinning of ring lug terminated regular stranded or
solid wire.  The theory being that if the crimp lug has been properly sized
to the wire and the tool used is properly calibrated for the lug/wire being
crimped that the crimp forms a gas tight seal and further treatment such as
soldering it is unnecessary or even detrimental.  I have supporting
documentation from Amp for this statement.

Ok, now enter tinned Litz wire.  Does the properly sized lug/wire
combination require soldering after crimping?  Some here say it must be
soldered the argument being the solder is softer than the copper and
therefor there will be cold flow.  Also if it heats up the solder could
melt, but if that happens there are bigger problems than just the
crimp/solder joint, IMHO.  I believe crimping and tinning of Litz is not
necessary, simply crimping is sufficient.

Opinions?

Reference links;

https://en.wikipedia.org/wiki/Litz_wire

https://www.newenglandwire.com/en/products/litz-wire-and-formed-cables/types
-and-constructions


Phil Nutting  |  HVP Development Engineer   |  Excelitas Technologies Corp

Lab: +1 978.224.4332   |  Office: +1 978.224.4152
35 Congress St, Salem, MA  01970 USA
[log in to unmask]<mailto:[log in to unmask]>
www.excelitas.com<http://www.excelitas.com/>


[Excelitas R_emailsig]


Please consider the environment before printing this e-mail.
________________________________
This email message and any attachments are confidential and proprietary to
Excelitas Technologies Corp. If you are not the intended recipient of this
message, please inform the sender by replying to this email or sending a
message to the sender and destroy the message and any attachments. Thank
you.


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________