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April 2002

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Subject:
From:
David North <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 4 Apr 2002 12:29:21 -0800
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I am looking at some single sided boards that were assembled and soldered at
two different companies.  Under magnification, the solder fillets to the
leads inside the holes (not the solder fillets on the solder side of the
board) have a characteristic that appears to be a defect.  At the tops of
the fillets, which are generally shaped properly, there is a tiny gap,
usually around the entire circumference of the lead where the fillets appear
to have peeled away from the leads.  Nearly all leads on each board exhibit
this characteristic.

The solder fillets on the solder side appear generally perfect.

Is this common to single sided boards?  What is the cause and how can it be
corrected?

David North

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