Electronics Forum | Sun Dec 09 22:54:20 EST 2001 | dburr
It sound you have already discovered to root cause, flux entrapment in the via holes. Short of changing the desing, here are sone suggestions. The main thing is you have to dry out the via holes of the wet flux. Some things to try are: slow down t
Electronics Forum | Fri Mar 17 21:44:14 EST 2000 | sosina_outry
Daren: suggestion from a friend of mine 1. Is residue on the top or bottom of the board? If on the bottom, then you might need to do solder dedross. if on the top, you might need to check 1. after spray flux, check for any excess flux on the top of
Electronics Forum | Tue Jun 04 16:12:41 EDT 2002 | Bob
The original profile had a higher ramp rate, and the apertures were 100%. The ramp rate is now much gentler and the addition of a small soak area around 160 � 170 degrees should burn off any excess flux. Appertures are now smaller and we get no leac
Electronics Forum | Fri Sep 12 06:02:55 EDT 2003 | Neil Trelford, Nortel
Even though you use a no clean process, it is still possible that some type of fluid has created the "short". Production lines are notorious for using cleaning chemicals on PCBs to clean excess flux after rework on other areas. Unless this type of c
Electronics Forum | Wed Apr 04 19:31:57 EDT 2007 | rgduval
Dave, We're reworking with flux and solder. We're observing "exploding" joints, as well...as though something is trapped in the joints (either excess flux not burning off during solder, or residual moisture). As mentioned above, I spoke with the f
Electronics Forum | Wed Sep 19 12:27:56 EDT 2012 | proceng1
Are you sure that you are getting adequate nitrogen flow up through the cap? If your pump isn't seated properly, you may have nitrogen escaping. Also, I have two different height nitrogen bases. The shorter one does not allow as much gas to escape
Electronics Forum | Mon Jul 02 18:40:33 EDT 2012 | joeherz
We used to have a Nuclean 324 that was running closed loop with a DI water recirc system. We also had problems with foaming that was solved with a relatively simple fix. We bypassed the final rinse solenoid so that it was always running. This allo
Electronics Forum | Mon Jan 17 17:38:29 EST 2011 | bandjwet
All: I am reaching out to get some suggestions on the right flux to use as well as a recommended cleaning process for soldering a KOVAR RF shield using 80/20 Au/Sn solder to a ceramic hybrid. The recommended profile is 4-5 min at 280C and at least
Electronics Forum | Thu Jun 08 17:13:41 EDT 2006 | davef
We don't agree that "a little to the top would just even things out". The raw flux on the top of the board never touches the wave and so, does not receive the proper amount of heat for activation, except at the through hole barrels. * We assume WML
Electronics Forum | Wed Apr 28 15:08:10 EDT 2004 | russ
This could be a long shot but here goes. I have found that if flux is applied in excess that it will actually "move the solderballs" during reflow. I have actually seen where the balls are completely outside the package and oviously there are short
