The heating cable runs about 1A, and is about 1.5 Ohms per foot. It is used for heated clothing, so we are not getting into "high current" territory. The largest garment is about 100 watts, and actual temperatures must be kept relatively low for safety reasons.
Unless somebody has a flux/solder combination that wets the Carbon fibers, I'll probably need some sort of compression connection.
Thanks,
Carl
Carl Van Wormer, P.E., AE7GD
Senior Hardware Engineer
Cipher Engineering LLC
21195 NW Evergreen Pkwy Ste 209
Hillsboro, OR 97124-7167
503-617-7447x303
[log in to unmask] http://cipherengineering.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Thursday, March 27, 2014 2:16 PM
To: [log in to unmask]
Subject: Re: [TN] electrical connection question
If this is a heating cable it implies a high current application.
That could make conductive epoxies problematical.
A crimped connector that can then be soldered might be a better alternative.
You could consider a high Bismuth alloy which will shrink on cooling, possibly in a tube arrangement. That will give a good mechanical clamp/grip and a gas tight bond. This type of arrangement is used for optical fibre bonding/sealing and in some magnetic applications. (Where the magnetic material is not solderable).
Depends on how "long term reliable" you need to be.
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer
Sent: Thursday, March 27, 2014 8:28 PM
To: [log in to unmask]
Subject: [TN] electrical connection question
I'm trying to make a long-term reliable connection between some Copper wires and some Silicone jacketed Carbon stranded heating cable. An example of the cable is at
http://www.alibaba.com/product-detail/Silicone-insulated-carbon-fiber-heatin
g-cable_863719692.html?s=p
Our customer is currently wrapping the Copper wire around the Carbon fibers, and then applying solder to the Copper strands to enclose the "joint". This does not seem to promise a long-term reliable connection. I am considering some experiments with conductive epoxy and/or making some crimped tubes, clamping the overlapping Copper and Carbon strands.
Is there any place I can find some "fatherly guidance" as I begin to explore this territory?
Thanks,
Carl
Carl Van Wormer, P.E., AE7GD
Senior Hardware Engineer
Cipher Engineering LLC
21195 NW Evergreen Pkwy Ste 209
Hillsboro, OR 97124-7167
503-617-7447x303
[log in to unmask]<mailto:[log in to unmask]>
http://cipherengineering.com
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