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March 2012

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From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 7 Mar 2012 07:28:18 -0600
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Hi Pat - could the half moon defects be plating defects (aka mouse bites 
from hydrogen bubbles formed during plating) instead of a mechanical root 
cause?

Dave Hillman
Rockwell Collins
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"Goodyear, Patrick" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
03/06/2012 04:34 PM
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Subject
[TN] Damaged board traces,






Working on single sided legacy boards, I finding half moon rub marks on 
the traces adjacent to pads, about 0.15" (3.5mm) away.    They are 
circular in nature (half moon shape) on the edges of the traces. 
Definitely mechanically made.   These boards are roughly 40 years old and 
have never been used.  I'm inspecting them prior to installation.
Anyone know of any OLD process that could make these types of marks.  I 
have inspected 4 boards and find the same types of deformation on all of 
the boards although not in the same places.

   I suspect the boards were originally hand soldered, as there is no 
solder mask on the runs and they are plated with no excess solder clinging 
to them.

   pat


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