Electronics Forum | Mon Nov 19 09:34:50 EST 2007 | bbarton
Real Chunks...Yes, that's the most glaringly obvious defect in the short term (you'll probably find it on your production floor if it's really bad) but you may find that everything looks good short term only to have a high level of customer returns..
Electronics Forum | Tue Feb 24 09:52:14 EST 2004 | davef
First, two points about hole / barrel fill are: * A filled hole is an excellent indicator of the optimum process and optimum quality PCB. * The study that showed that holes need not be filled was paid for by the US Army and performed by Lockheed in
Electronics Forum | Tue Oct 27 16:22:00 EDT 2009 | davef
It's not the first thing we think of in looking at your picture. First off, the lack of copper in the region of the red oval makes us think of a plating defect. We don't expect that moisture out-gassing through the barrel wall to show-up on opposite
Electronics Forum | Fri Nov 16 08:22:03 EST 2007 | ck_the_flip
For those of you who've completely switched to Pb-Free or who're running in a mixed environment, are you also buying or specifying the "RoHS PCBs" - the ones with * Greater Tg (glass transition temperature) * Thru-holes with limited drill hits and
Electronics Forum | Thu Mar 29 07:37:45 EDT 2012 | davef
The current discussion about solder fountains has to do with copper dissolution. Broadly, copper dissolution is the weakening of copper traces where a trace and a barrel plating intersect due a loss of the copper into the solder. Longer contact time
Electronics Forum | Thu Apr 18 16:52:15 EDT 2002 | davef
General comments are: * First place I would look is the supplier of the pins that you are trying to install. Most suppliers that sell press fit components have done a good deal of work to qualify the component and will have all the specifications yo
Electronics Forum | Thu Aug 17 17:36:08 EDT 2006 | slthomas
I don't have any data (haven't tried this), but it doesn't take much thought to see that determining the risks associated with simultaneously applying compressive and rotational forces to the end of the barrel, not to mention chewing up the copper, i
Electronics Forum | Wed Nov 05 18:39:06 EST 2008 | joeherz
Hello, We have recently installed a selective soldering machine and are seeing some voiding/cratering in random locations. We have done some basic experimenting with fluxing parameters, preheat and dwell times but haven't been able to eliminate it.
Electronics Forum | Mon Nov 19 10:37:53 EST 2007 | ck_the_flip
Bruce, Does the thicker barrel plating for "RoHS-Rated" PCBs alleviate some of the copper dissolution that one might experience from SAC305? Also, for those SN100c experts out there, is Sn100c less likely to dissolve copper?
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