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October 2000

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Subject:
From:
Carl Barnes <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 2 Oct 2000 15:50:50 -0700
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        Technetters,

Need some help from all the soldering experts out there. We have a group of
boards that show evidence of poor solder quality throughout the board. To
the novice eye, it looks like the solder paste did not reflow completely.
There appears to be small balls of unreflowed solder and small pin holes in
some of the joints. Most of the quality group thinks that the profile was
not hot enough. However, when the engineering group came to examine the
joints, they stated, "Why No, these joints were just the opposite, they were
liquidous too long!" Can I get some opinions on this? Any one out there with
examples of solder joints that reflect these two scenarios would be
appreciated. Please send them directly to me. We are having these joints
cross sectioned, once the pictures come in I will forward to anyone
interested. Thanks in advance of any help anyone can give.

Carl Barnes
Production Process Analyst

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