Electronics Forum | Wed Jul 29 07:57:16 EDT 2009 | davef
Search the fine SMTnet Archives to find previous discussions, like: http://dev.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=5157
Electronics Forum | Wed Jul 29 08:05:25 EDT 2009 | patrickbruneel
Deni, You also need to check if your flux is properly wetting the board. Flux dewetting on the surface can also cause webbing. You can check that with spraying flux on the board surface and watch the wetting behavior. Patrick
Electronics Forum | Fri Jul 31 02:59:52 EDT 2009 | dj_jago
I can't open the picture but if it is webbing and you are running with an alcohol based flux (non VOC free) another thing to check is the Specific Gravity.
Electronics Forum | Thu Sep 10 15:10:12 EDT 2009 | mefloump
This has some good iinformation for wave solder defects... http://www.trafalgar2.com/troubleshooter/wave_soldering.htm
Electronics Forum | Sun Sep 27 23:10:19 EDT 2009 | hallwayit
Hi, Walter, Why don't you try no-clean flux? We ever met the same condition, later, we changed to no-clean flux solved the problem.
Electronics Forum | Wed Nov 04 08:17:23 EST 2009 | bobpan
Is there any sticky residue on the top of the part? Or maybe it has something to due with magnatism and maybe you could source a plastic nozzle instead of using the standard machine nozzles. Good Luck
Electronics Forum | Thu Nov 05 12:48:57 EST 2009 | adlsmt
We have the same problems. We are using Universal equipment. In our case as I suspect in yours its a residue on the LED's not the machine.
Electronics Forum | Thu Nov 19 22:48:22 EST 2009 | davef
Since the bubbles: * Are only on the solder connection, we'd guess there must be some compatibility issue between the flux residues and the conformal coat materials. * Occur after curing, we'd guess the cure recipe is too rapid and is entrapping voli
Electronics Forum | Fri Nov 20 15:45:24 EST 2009 | patrickbruneel
Dave was that a no-clean flux residue? And if so alcohol or VOC free (water based)
Electronics Forum | Sat Nov 21 08:52:22 EST 2009 | davef
Patrick: The flux was OA, but you can get the same result with low residue flux.
