Electronics Forum | Mon Oct 26 12:40:08 EDT 2009 | awtm
pls find attached photo from Supplier saying that the failure at pth hole was due to blistering caused by moiture evaporate rapidly resulting delamination occur on FR-4 material from an old PCB (3yrs). Pls advise if attached picture confirms such co
Electronics Forum | Wed Feb 07 14:57:18 EST 2007 | davef
The standard Metronelec Menisco ST 60 can not run a dip and look test for PTH parts. It is an optional feature on that machine.
Electronics Forum | Tue Nov 03 18:35:28 EST 2009 | gregoryyork
was this hasl finish looks like it has been corroded from the inside of the hole wall looking at the shape of the break in plating
Electronics Forum | Wed Nov 19 15:16:47 EST 2014 | warwolf
Interesting, see we used to do a large amount of PTH but we have been able to convert most of those parts to SMT now. the majority of our PTH is connectors. I am doing some research as to the types of through hole assembly that still remain.- This d
Electronics Forum | Tue Sep 10 10:38:12 EDT 2013 | rway
Most of the PTH components are manually inserted. Some are auto-placed by our UIC machine. The parts are preped before install, so there is no need to trim the leads afterwards. The boards go through wave solder. The UIC machine has a clincher on
Electronics Forum | Thu Nov 20 16:51:48 EST 2014 | joe98375
gregp: Our PTH process has not changed in many years. Our products are fairly simple as far as electronics goes and everything gets potted anyways. ~90% of everything we build is single sided TH with ~ 100 solder joints per board. Each board is ~
Electronics Forum | Thu Jul 23 10:14:31 EDT 2020 | robl
The odd form assemblers are extremely slow compared to the Axial & Radial UIC machines. Also there is a big cost for feeders. Key question is what is the max axial & Max radial feeder count on your biggest job and that will quickly tell you how man
Electronics Forum | Tue Oct 27 06:29:49 EDT 2009 | lococost
Yes it is possible, and yes you shouldn't trust boards that have this problem. You're best off baking PCB's this old befor reflow. This looks like barrel cracking, a quick google gives: http://www.eco3.co.uk/e3toolkit/e3toolkit/modules/05/05_04_j_pc
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 | Thu Feb 05 05:27:55 EST 2004 | dszeto
We have recent customer asking for PCB's PTH hole size related to soldered wire AWG 18-26. Please kindly advise any international standard for captioned issue. Thanks!
