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April 2004

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 8 Apr 2004 21:27:11 EDT
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In a message dated 4/8/04 10:52:47, [log in to unmask] writes:
> Regarding your last comment, if the lead / foot wasn't solderable at all
> would you expect the formation of a joint ie. a nice meniscus as we have,
> though obviously a weak metallurgical bond I wouldn't have thought so!
> 
Hi Iain,
Yes, you get nice looking 'solder joints' which are NOT solder joints because 
no metallurgical bond has formed. Externally, these 'joints' are 
indistinguishable from   good ones.
215°C may be insufficient--hand soldering provides much more heat; but 
without prying these hand-soldered joints apart and seeing what the failure mode is 
[interfacial vs. through the solder], you actually do not know whether 
hand-solderiing improved the situation oyher than adding more solder volume.

Regards,
Werner Engelmaier

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