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May 2009

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Subject:
From:
Hernefjord Ingemar <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Hernefjord Ingemar <[log in to unmask]>
Date:
Thu, 7 May 2009 08:50:01 +0200
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Beverly,

we solder to nickel daily. Watt do you want to know? There is nickel and there is nickel. We avoid bright low P level nickel. There are two nickel types that work pretty good, the one is a 7%P sulfamate and the other is electroless half matte. Immediately after the nickel plating,  the parts are put in nitrogen boxes. Soldering is done with ordinary tin/lead solder with a in-line vapour phase machine, with a VP batch machine or simply with soldering irons. Flux is RMA. If the nickel is old, we may need RM or a few seconds exposure to more aggressive fluxes. We have been soldering to nickel for decades without any serious issues. Conveyour ovens or other IR ovens don't work very good. We have very stringent requirements on these solder joint, have to pass helium fine leakage tests.

Inge

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: torsdag 7 maj 2009 01:41
To: [log in to unmask]
Subject: [TN] Nickel - again

Technetters,
Have any of you had any experience with trying to solder tin-based solders to uncoated nickel?  What kind of flux did you use?  Do you know if the joints had long term reliability, not just appearing to be "strong" joints right after formation?  What about negative wetting angles causing possible stress concentration points?
Bev
RIM

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