Bob,
Yes, the stripping is accomplished by the tinning process as it "burns off" the Nylon thread serve and the enamel coating on each starnd. Chemical stripping brings in a whole bunch of issues we chose not to play with.
Depending on the Litz wire and the frequency range of system operation the individual strands of wire could be as small as 40 to 48 gauge and lots of them.
-----Original Message-----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: Thursday, October 22, 2015 5:09 PM
To: 'TechNet E-Mail Forum'; Nutting, Phil
Subject: RE: [TN] to solder or not to solder Litz wire in crimp lug
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
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