Electronics Forum | Sat Sep 09 08:21:36 EDT 2000 | Sal
guys Currently experienced this problem on a product which had been running satifactorily for a period of time. No process changes were made, The problem was highlighted when after ICT when the boards were loaded in to the stress chamber, after the
Electronics Forum | Mon Jan 13 18:22:55 EST 2003 | davef
100 sec) and decrease reflow temp to 205C. * Understand that voids are primarily process indicators. There is experimental evidence that voids retard crack propagation locally around the void on a temporary basis. There is no standard, IPC or otherw
Electronics Forum | Thu Jan 16 04:02:18 EST 2003 | johnw
The IPC 610 actally conflict's with 7095 which give's a better indication of what's acceptable. I believe that IPC are reviewing both. Motorola did a bunch of work before basically showing that void's aren't that bad up to a certain size, I think pro
Electronics Forum | Thu Apr 23 07:51:45 EDT 2009 | scottp
Every paper I've seen published shows that BGA voids either have no effect or actually give a slight improvement. The one exception are voids with a root cause in bad incoming boards, such as champagne voiding where nearly the entire interface is go
Electronics Forum | Mon Mar 12 10:29:07 EDT 2007 | george
Are you using wave solder pallets? I use same flux and solder as you do. I've seen this problem when some walls in the wave fixture cause a "shadowing effect"...if you enlarge those openings you will increase the dwell time eliminatting voids (if the
Electronics Forum | Wed Feb 28 19:44:50 EST 2001 | pzohbon
I am having problems with voids in our soldering process. I believe it to be the fact that we use a no clean flux without control on how the boards are handled (gloves, procedures, etc.) Does anyone have suggestions on the appropriate place to start?
Electronics Forum | Thu Feb 21 04:41:37 EST 2008 | mun4o
hi,Toni, we use only FR4.Some of PCB we order in China and Taiwan.With these PCBs we can't any problem.Other PCB we order here in Bulgaria.The problems with voids start last year - we have voids only in PCBs from Bulgarian factory.The process is sam
Electronics Forum | Fri Mar 02 08:52:20 EST 2001 | markkrmp
Are your voids looking like blow holes also? Is this only occurring on the solder joints of the Thru Hole components and Via's? Or does this happen on SMD pads? My experience is that we have seen this but only with some of our older PCB's which are
Electronics Forum | Fri Mar 09 12:41:56 EST 2007 | coop
I have recently been handed over the waving operation here, and am unclear on how to address our recent issue with our Wave. We are using AIM WS-715M Flux in a Foam fluxer, and are using AIM SN-100C in the wave. The problem is on several of the assem
Electronics Forum | Wed Feb 20 09:29:19 EST 2008 | mun4o
ni, I had similar problem too.I bake PCB in SW mashine - about 8h ,T=90 C.Problem is in the base material of PCB - there are moisture in the material.After my complaint to PCB factory , they change material and the problem disappear.
