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Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 5 Jun 1998 11:33:27 -0600 |
Content-Type: | text/plain |
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All,
I'm Baaack....
Got another one for you all. We occasionally have a need to
rework a solder connection or an assembly by removing solder
from the PTH's. Our rework/repair operators are very
skilled in this type of work and use the following methods
to remove solder - Solder wick, one shot solder suckers, and
continuous vacuum solder suckers. Our customer is concerned
about the use of the wick and the one shot solder suckers.
He states that at one time they were not allowed on the high
reliability standards (Mil-Std-2000) because of damage they
cause.
My question: What kind of damage do they cause except in
the hands of an unskilled operator?? Our rework/repair
success rate is phenomenal here. Our rework operators (the
only ones allowed to use the solder suckers) are trained and
skilled in what they do. Our customer isn't telling us we
need to get rid of our solder wick and suckers, but I am
sure he expects us to answer his concerns. I would consider
it sufficient that we simply don't have any failures
attributed to solder rework or repair, but would like a more
educated answer than that.
His concerns are based on a white paper he reviewed quite a
number of years ago. He believes the solder sucker problems
come from a thermal shock problem when ambient air is forced
through a hot PTH. Some merit there, but any real-world
problems?
Any Insight?
Thanks in advance!
Steve McBride
[log in to unmask]
(405) 624-5281
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