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>From bergdi Thu May 15 13: |
09:18 1997 |
From [log in to unmask] Mon May 19 09: |
56:32 1997 |
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Hi TechNet!
Does anyone have any knowledge regarding solder dross contamination in
otherwise properly formed solder joints? The joints were formed in a
wave solderer and exhibit dross contamination roughly .005" - .010" in
diameter.
**Solder dross typically ends up in solder joints when the wave solder
pot maintenance is poorly done or you have a solder wave motor
problem. Check out those areas first as a corrective action.
The joints seem to have proper "meniscus" and are mostly "shiny", but
are dull around the entrapped dross.
**Solder dross trapped in a solder joint may not be a bad thing
depending on what the use environment of your assembly is. However,
solder dross should not be ending up in your solder joints - this
condition is an indication that the soldering process is out of
control and needs corrected.
Is this purely cosmetic or does it present a potential solder joint
problem?
**Solder dross in the solder joint will definitely change the
solder joint/stress interactions and could lead to solder joint failure
depending on the use environment.
Good Luck
Dave Hillman
Rockwell Collins
[log in to unmask]
______________________________ Reply Separator
_________________________________
Subject: FW: FAB: Dross in Solder Joints
Author: [log in to unmask] at ccmgw1
Date: 5/15/97 12:50 PM
Hello Technet:
Does anyone have any knowledge regarding solder dross contamination in
otherwise properly formed solder joints? The joints were formed in a wave
solderer and exhibit dross contamination roughly .005" - .010" in diameter.
The joints seem to have proper "meniscus" and are mostly "shiny", but are
dull around the entrapped dross.
Is this purely cosmetic or does it present a potential solder joint problem?
Thank you for your help
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