Electronics Forum | Sun Nov 22 09:36:17 EST 2009 | patrickbruneel
Dave, A low residue/No residue flux does exist that when an excessive amount of flux is applied it would only create a cosmetic problem not a reliability issue. The active ingredients are neutralized by the heat applied in the soldering machine and
Electronics Forum | Fri Feb 05 20:39:41 EST 2010 | localperm79
I've recently been placed in control of operations of our SCS conformal coat sprayer and I must eliminate problems with wicking of humiseal 1b73 into surface mount connectors while also trying to minimize masking as much as possible. We use a 55:45
Electronics Forum | Mon Aug 22 10:15:30 EDT 2011 | davidalvarez
we have never had a problem using no-clean flux as far as far as shorts and testing problems, using high pressure test probes helps overcome this. The problem we have had is if a unit comes back down the line a couple of years later we notice that t
Electronics Forum | Wed Sep 14 15:42:45 EDT 2011 | nowak18
During temperature cycling we have determined that the conformal coating wicking underneath our BGAs has caused fractures in our solder balls. One proposed solution is to run an RTV dam around the parameter of the BGA to prevent the CC from wicking u
Electronics Forum | Fri Nov 18 11:43:05 EST 2011 | rway
What type of contamination is it? Flux residue or something else? If you are having contamination issues, you have a problem with your process. Simply washing the boards or using a roller may fix the problem, but you are treating the symptom, not
Electronics Forum | Thu Nov 10 02:04:26 EST 2011 | julien
We've got the same problem here, what we do is to apply peelable solder mask around the connectors or the exclusion zone. But be carefull! Sometimes the soldermask get inside the connectors and you can't remove it so you have to change it. Another th
Electronics Forum | Sat Feb 04 09:36:51 EST 2012 | davef
You bet. Using a high temperature solder is a perfectly reasonable way the attach thermocouples. Just remember that the solder will not flow on the thermocouple. You need to use a solder iron to lay the solder over thermocouple to hold it in place.
Electronics Forum | Fri May 18 13:08:19 EDT 2012 | blnorman
I'll chime in here as well. If you have adhesion problems, 90% of the time it's contamination on the substrate (soldermask, flux residues, cleaner residues, etc.). Like Dave said, omega meter is a test for gross cleanliness, and it's OK for process
Electronics Forum | Fri Dec 18 12:25:40 EST 2015 | deanm
We are required by AS9100 to keep expired material/chemicals off the floor. Examples include solder paste, flux, adhesives, conformal coating, etc. We have a system in place to prevent such occurrences but once in a while something is not accounted f
Electronics Forum | Thu Jan 14 09:25:34 EST 2016 | davef
IPC-A-610F 10.2.6 Laminate Conditions - Depanelization talks to the acceptability of the depanelization criteria for assembled boards. There is no requirement for moisture sealing with epoxy or other material. Basically, the standard requires that th
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