Electronics Forum: barrels (Page 1 of 28)

Plating crack

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

Thermal relief question

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

Selective Soldering - Barrel Fill

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

PCB Delamination in PTH hole

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

Selective Soldering - Barrel Fill

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?

Selective Soldering Equipment selection

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

Black stain... what causes it?

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

Does pot temperature affects quality of the solder joints?

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.

Lead free selective solder

Electronics Forum | Thu Jun 29 12:07:09 EDT 2017 | georgetruitt

HOW THICK IS THE BOARD? IS THERE A LOT OF COPPER IN THE BOARD? DOES YOUR CUSTOMERS PROVIDE HEAT RELIEF IN THE BOARDS BARREL DESIGN THERE NEEDS TO BE PLENTY OF ROOM FOR LEADFREE SOLDER TO FLOW, DID YOU CHECK YOUR PIN(LEAD)TO HOLE (BARREL) RATIO? N

Ceramic Caps

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

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