Electronics Forum | Fri May 29 08:25:13 EDT 2009 | floydf
We are getting what looks like cold solder joints on one of our boards. The boards have an aluminum substrate, and use OSP plating. The solder is lead free - 96.5 Sn, 3.0 Ag, .5 Cu. The flux is no clean. When we first had the problem, my solder profi
Electronics Forum | Tue Aug 24 15:05:39 EDT 2004 | Dreamsniper
There is danger in doing this based on theory. Chances of the solder joints becoming cold or having poor wetting due to the fact that during the first run all the flux vehicles had evaporated and with the second run they're no longer present to help
Electronics Forum | Fri May 21 15:23:24 EDT 1999 | JohnW
| | Has anyone had any experience or data using vibration during the reflow process. | | We introduced a vibration device attached to the fixed rail on a Vitronics reflow oven. The reason was to prevent skewing on large PLCC devices. The process work
Electronics Forum | Fri Sep 13 06:18:55 EDT 2002 | yngwie
Here's a long survey....Pls help. 1) What is the general feel for via in pad for upcoming designs? - complete Via in pad - partial encroachment - via partially in pad 2) What are the manufacturing bare PCB's related concerns, issues and possible dr
Electronics Forum | Thu Jun 12 11:12:08 EDT 2003 | babe
The last statement saying that seeing down the bga component with these systems is useless, is an incorrect statement. First with x-ray you do not see flux residue and or flux migration, second with x-ray you do not see a cold solder joint. Visual i
Electronics Forum | Mon Sep 17 17:33:38 EDT 2012 | kq702
thank you for your reply. I felt like I was using too much heat but I thought it would not work unless I did so. I did not suspect a cold solder joint, however I did another test on a scrap board. I heated the board without my clamps attached (I put
Electronics Forum | Mon Sep 11 04:10:46 EDT 2000 | Jim Arnold
I spent 25 years operating my own hybrid shop working with surface mount components, soldering materials and procedures. Dealing all the while with it's associated surprises and problems such as yours. Now-a-days I get paid to investigate and attemp
Electronics Forum | Fri May 25 13:38:15 EDT 2007 | mfgengr
TAL Too Long - dull solder joints, dewetting. TAL Too Short - cold solder, insufficient wetting. You want TAL to be as short as possible (but not lower than 30 seconds), but long enough for every solder joint to be above TAL for at least 30 seconds.
Electronics Forum | Mon Mar 09 10:12:43 EST 1998 | Justin Medernach
| Cold Welding | I'm presently doing a project on reflow profiling. | I came across this expression. Can someone please give me a definition. | Best Regards | Tom Mc Grath Tom, I think what you are referring to is also called cold solder. You have
Electronics Forum | Thu Aug 12 10:50:19 EDT 1999 | John Thorup
| Hello everyone, | | I would like to know more about the so called FACETED or "Mirror ball" surface apperance. Its cause and how to eliminate / corrective actions for it. | | pls. help... | | thanks and best regargs, | ...Omat | Omat While I hav
