Electronics Forum | Wed Sep 27 12:44:52 EDT 2000 | Ashok Dhawan
What could be possible resons for " Plating Crack on Barrel (tented via)" This tented via is in proximity to parts being hand soldered. The crack in barrel was detected on failure analysis - micro-section of via where barrel is having crack ( circul
Electronics Forum | Sat Jun 11 07:51:15 EDT 2016 | davef
Hi Steve ... There are arguments between fabricators and thermal relievers about adding non-connected copper tabs to barrels in hopes of providing thermal relief, but that's not what you're talking about, I believe. I don't foresee an issue moving t
Electronics Forum | Fri Oct 15 08:01:12 EDT 2010 | patrickbruneel
What you have is blowholes. Baking your boards prior to soldering will help. Root cause is either barrel plating too thin or barrel cracks allowing laminate moisture to escape. Patrick
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 | Wed Apr 13 21:17:18 EDT 2022 | stephendo
If it was ROHS, I would say that the pads are definitely dissolved away. And it sounds like that is the case here. Your best bet is if it is class 2 and the barrels are at least 50% then push for them to be accepted. If you are trying for more barr
Electronics Forum | Fri Oct 15 11:03:50 EDT 2010 | hegemon
Well, we got the baking part right at least. I would think that would help to rule out the barrel cracks allowing moisture escape. Plating too thin makes sense to me. In any case, do you think barrel cracking would be observable on a bare PCB?
Electronics Forum | Fri Jan 07 09:03:44 EST 2022 | jineshjpr
Hi Everyone, I want to understand what is the copper thickness to be maintained in PTH Barrel hole. Is this same as Fab recommendation of surface finished copper thickness like 25/35/70 microns..??? Is there any specific IPC standards available to un
Electronics Forum | Fri Oct 15 08:00:09 EDT 2010 | patrickbruneel
What you have is blowholes. Baking your boards prior to soldering will help. Root cause is either barrel plating too thin or barrel cracks allowing laminate moisture to escape. Patrick
Electronics Forum | Fri Jan 25 19:01:35 EST 2013 | hegemon
My first guess is that the plating in the barrel (via) has failed and allowed laminate/epoxy egress into the barrel and out to the surface of the board. Just a guess based on the picture.... 'hege
Electronics Forum | Thu Feb 02 11:01:57 EST 2017 | charliedci
Maybe increased barrel fill? Raising pot temps slightly seems to increase barrel fill at selective solder, something we battle with.
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