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April 2015

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Subject:
From:
Mike Fenner <[log in to unmask]>
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Date:
Wed, 1 Apr 2015 23:44:44 +0100
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You will find that though there are a number of candidate alloys with
solidus >250C, few will be available as flux core according to supplier. You
might also have to compromise on diameter. These alloys are not used in
large enough amounts to warrant availability from stock in all possible
combinations. 
My former colleagues will no doubt recall me grumbling: "It's not just
melting point". You really do need to consider also surface finishes,
service environment and stresses, max process temps, etc. Better to discuss
the app with your supplier and determine the best alloy(s) for it and then
the best presentation for applying it, keeping in mind that in-service
performance generally trumps ease of application. 
Be aware higher melting point alloys generally are more difficult to form
joints with and you might need to consider background heating to augment
iron. Flux residues are likely to be harder to remove also due to increased
thermal degradation.



-- 
Regards 
 
Mike Fenner 
Bonding Services & Products
M: +44 [0] 7810 526 317 
T: +44 [0] 1865 522 663

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey A
Sent: Wednesday, April 01, 2015 3:20 PM
To: [log in to unmask]
Subject: [TN] HIGH Temperature Solder

I need to spec a high temperature wire solder for hand soldering. I need to
have a solidus of greater than 250 degrees C. Is 90Pb10Sn my best/only
choice or is there something else I should look at?

Jeffrey McGlaughlin, C.I.D.
Engineering Designer
Avionics Systems & Tech Refersh
Office: 614.424.7582| Fax: 614.458.7582
[log in to unmask]<mailto:[log in to unmask]>

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