Electronics Forum | Thu Aug 20 14:52:40 EDT 2009 | davef
Armando: We're guessing that the white residue is on the laminate also. We believe that the residue has something to do with your low residue flux and water. It could be: * Water contamination in the flux. * Poor selection of preheat temperature that
Electronics Forum | Wed Jan 17 22:35:21 EST 2007 | JNet
Is the oven air or nitrogen? If it is air I would suggest more exhuast to pull the flux vapors out if the oven before they can condense in the cooling. If it is a nitrogn machine that makes it a little more complicated. If the filter system is clogge
Electronics Forum | Sat Jan 10 12:21:15 EST 1998 | eyal dickerman
If you are using water cooling in yr oven , look for flux condensation on the heat exchanger.
Electronics Forum | Thu Aug 22 15:31:52 EDT 2002 | Claude_Couture
In an oven with flux reclamation system, once the circulation is prevented by accumulation of flux in the heat exchanger, the flux will condense where it can, and some of it will coat your PCBs with a uniform layer of flux on the parts/ joints/ goldf
Electronics Forum | Wed Aug 04 00:22:17 EDT 2004 | Shean Dalton
and one more thought about your original question, if the flux does look really strange and out of place, then inspect the reflow oven. A great amount of flux condensation in the reflow oven's cooling zone can cause crystalized flux to become airbor
Electronics Forum | Wed Aug 21 11:36:05 EDT 2002 | scwalsall
Regarding the non-adherence of this maintenance schedule......should we expect to see flux condensate on our solder joints?? Possibly leading to solder joint contamination, dry joints, solderability issues in production etc.??
Electronics Forum | Wed Aug 14 11:34:24 EDT 2002 | carln
Is your exhaust duct connected to a reflow oven that is used for flux? The condensate may be carring over from another oven that shares the same duct.
Electronics Forum | Tue Aug 13 16:47:22 EDT 2002 | mick
The residues are from the flux, not adhesive. Do you have flux management system in oven? You also need to check the flux type = can you use low solids. The effect is the same as steam in bathroom - it is cooling affects in exhaust and flux reforming
Electronics Forum | Tue Mar 31 12:43:52 EDT 2009 | dallascap
I don't think there is anything releated to IR light in your false calls rate rise on Post-reflow. Soldering Flux is most probably the reason. Indeed, more or less soldering flux residue condenses on the boards according to the oven extraction syst
Electronics Forum | Sat Dec 09 16:54:25 EST 2006 | billwestiet
With high volume production, this can happen. The flux is vaporizing in the heating zones, and is condensing in the cooling zones. Depending on the machine, cooling can act differently on different machines. Less cooling may reduce this problem.
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