Electronics Forum | Wed Sep 01 05:23:08 EDT 2010 | leeg
We are having solder bridges on a fine pitch QFP and was wondering whether printing speed directly affects the bridging and is there a typical formula to work out print speed?
Electronics Forum | Wed Apr 30 14:41:55 EDT 2014 | emeto
Thank you all for the posts. From all I read lately I will probably try a different solder paste and if that doesn't work I will go for a flux feeder. I will keep you posted.
Electronics Forum | Tue Feb 19 08:41:02 EST 2019 | prasanth
dear experts, i want your suggestion for getting a profile in Heller 1707 mk iii series re-flow machine ,its 7 zone machine recently we had a solder ability issues , so pls guide me ,how to set rts profile parameters
Electronics Forum | Tue Mar 04 08:56:38 EST 2008 | tonyamenson
I talked to a solder paste chemsist and found out a few things. From above (Dave F) states a test for solder paste involving reflow on a non-wettable surface. Commonly known as the solder ball test this test is performed all the time by paste manufa
Electronics Forum | Wed Aug 26 22:14:07 EDT 2009 | davef
The blue tint could be the result of etching of the tin in your solder connection during cleaning when using a slightly basic cleaning solution. Just about anyone can duplicate this by running a board 7 or 8 times through a cleaner with a saponified
Electronics Forum | Sat Jul 24 00:31:21 EDT 1999 | Scott McKee
| Has anyone ever heard of testing solder paste quality by pasting a board and making a determination of the quality by measuring paste height and width after the board is pasted. Would you consider this a valid test for solder paste testing? | I ag
Electronics Forum | Tue Jan 04 09:26:22 EST 2011 | scottp
We've been doing this for over 10 years using flux. We print a tacky flux first using an 0.002 or 0.003" thick stencil, then print paste using a thicker stencil with the underside half etched to keep it away from the flux. In our case, we can't jus
Electronics Forum | Sat May 30 08:24:09 EDT 1998 | Dave F
| | | | We recently made the switch to no-clean and the wurface mount is turning out beautifully. However, the wave solder process continues to put up a fight; we are getting a white residue on the surface of the PCB. The residue is not locali
Electronics Forum | Sat May 30 12:51:29 EDT 1998 | Earl Moon
| | | | | We recently made the switch to no-clean and the wurface mount is turning out beautifully. However, the wave solder process continues to put up a fight; we are getting a white residue on the surface of the PCB. The residue is not loca
Electronics Forum | Mon Jan 12 08:59:57 EST 2004 | Paul F
I may have a similar problem at the moment with a QFP-68. Do the unsoldered leads leave a perfectly formed footprint in the reflowed solder? Do you usually find this issue occurring towards the corners of the QFP rather than in the middle of a row?
