Electronics Forum | Wed May 14 12:35:34 EDT 2008 | rgduval
Thanks, Chunks. That's the one point of the experiment that we haven't tried yet. Though, we came to the same conclusion just yesterday. Dave, so far, the most help we've gotten was from the paste manufacturer. I've involved the board house, but
Electronics Forum | Thu Sep 07 08:44:17 EDT 2006 | vicknesh28
Did check the coplanarity of the failed lead and found it to be as good as the wetting leads.
Electronics Forum | Thu Oct 12 13:15:37 EDT 2017 | davef
It is the two conditions pictured in IPC-A-610F, Figure 5-1 C, D. In the old, simplier days, we wanted our solder connection to have: * Low wetting angle * Shiny metal Today, the metal doesn't have to be shiny and the wetting angle can be a high
Electronics Forum | Fri May 12 08:58:04 EDT 2023 | tommy_magyar
This is a defect in all IPC classes. Solder has not wetted to the land where solder is required.
Electronics Forum | Thu Sep 07 03:47:07 EDT 2006 | vicknesh28
I have been getting non wets on fine pitch QFP packages on random leads during reflow process. I noticed that every time there is some flux residue left between the non-wet lead and the solder pad. No residue was not observed on the rest of the good
Electronics Forum | Thu Aug 23 20:56:08 EDT 2001 | davef
Print paste on tempered glass, place the parts, and reflow. What's the story?
Electronics Forum | Thu Sep 07 18:32:51 EDT 2006 | vicknesh28
Yes the part is reworked. It solders when it's reworked.
Electronics Forum | Fri Apr 29 04:36:49 EDT 2011 | city4497s
Hi Anyone encounter this type of reflow issue before?
Electronics Forum | Fri May 12 19:42:05 EDT 2023 | emeto
Have you tried cleaning these spots with anything?
Electronics Forum | Thu Jun 29 09:55:54 EDT 2023 | matouschekd
Yes, i tried cleaning it with PCB-Cleaner. Sadly, no success
