Silver soldering invar ?

Silver soldering invar ?

This topic has 3 replies, 3 voices, and was last updated 29 September 2014 at 18:09 by Tim Stevens.

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26 September 2014 at 14:00 #164693
WALLACE
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@wallace
One for the clockmakers…

Can invar be silver soldered without harming it’s low expansion properties ?

Thanks.

W.
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26 September 2014 at 14:00 #3695
WALLACE
Participant
@wallace
26 September 2014 at 16:22 #164708
Keith Hale
Participant
@keithhale68713
Invar can be silver soldered.

Ensure that the invar is in a fully annealed state and the joint design is such that the invar does not come under tension during heating.

Use 455 alloy with EF/HT5 Flux

Regards

Keith
29 September 2014 at 18:09 #165042
Tim Stevens
Participant
@timstevens64731
If you solder Invar to a flat surface of something else that expands, you will get distortion as the job cools, and perhaps enough stress to make the joint questionable. So, OK for joining end to end, but suspect for long joints.

Hope that helps – Tim
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