Dear TechNetters,

One of our customer is designing and prototyping some cryogenic temperatures measurement assemblies.

As part of the material used, the "temperature sensors" are supposed to be connected to the PCB with manganin wires.
The PCB is a flex with ENIG finish.

I never heard about this material before and found it was an alloy mixing 86% copper, 12% manganese, 2% nickel.

I checked the TechNet archive as well as the internet, but was not successful in finding guidelines about soldering those wires.
I found some words on NPL website about copper-manganese alloys : quote from website -> Joints between the copper manganese alloys and copper are made most effectively by welding in an atmosphere of argon, and by hard soldering if welding is impracticable.

On the other hand, I found some papers from some physicists or some hobbyist video stating that manganin can be soldered with regular tin-lead solder (well, at least they did it on their proto apparatus)...

Provided I can find only very few info and mostly not consistent, I turn my eyes on you experts out there.

Does anyone have experience in soldering this material?
Or more precisely, is this material solderable with some regular electronic solder alloys?

As usual, thanks a lot in advance for your valuable input.
Kind regards
sylvain
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Sylvain Kaufmann
CERN - European Laboratory for Particle Physics
Dpt : TE-MPE-EM
Office : 160/1-026
Tel : +41 22 767 37 02
Fax : +41 22 766 87 77
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