Electronics Forum | Tue Sep 02 15:29:36 EDT 2008 | bvdl
small pads like 0402 tend to get hot quite easily. looks like excessive heat is your problem here. pads are wetted, component leads are not. this means solder paste flux on top layer was exhausted before entering in reflow. your profile is the 'in-be
Electronics Forum | Sat Nov 03 10:57:27 EDT 2012 | davef
EricR: Regarding "*** By the way, since we have used the Tin-Silver-Copper lead free solder there has been a strange liquid type chemical leek from the oven exhausted pipes." ... I don't know anything about your process, but the first thing I'd inve
Electronics Forum | Fri Mar 19 07:06:04 EDT 2010 | grahamcooper22
That's a great picture of a terrible defect. The quality of solder powder is critical to a good paste (as is the performance of the flux of course). As powders get finer then the challenge to make them better and better is more demanding. It's unforg
Electronics Forum | Wed Apr 04 12:02:33 EDT 2001 | Adam
Guys Is it possible to completely eliminate random solder/microsolderballs from No-Clean products that go over the wave. The Assembly is a mixed technology product which is HASL finished. All profile types have been exhausted, 3 flux vendors have be
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 | Mon Aug 12 11:47:21 EDT 2019 | alexeyzb
Flux fume is not for breathing, that is why every oven must have exhaust system. If you have some problem with health you need doctors help, don't waste time for answer which don't help you.
Electronics Forum | Fri Apr 05 20:56:17 EST 2002 | cycorda
Dave, Some spray fluxers are a lot more efficient than others - some will have such little waste that most of it is carried out by the exhaust. One of the benefits of spray fluxing should be that it creates very little excess flux, therefore no n
Electronics Forum | Tue Apr 10 04:16:20 EDT 2012 | grahamcooper22
you are seeing a typical issue that is caused when such small volumes of paste are printed....there are several reasons for it..the tiny amount of flux in the small deposit becomes exhausted much quicker then it does in a larger deposit ( the flux ma
Electronics Forum | Wed Sep 05 14:51:47 EDT 2001 | gdstanton
Well, it appears after running both a bare and populated PWB we were seeing flux exhaustion on the uBGA. The problem apparently resulted by a recent maintenance effort where the air blowers in the reflow oven were replaced. The blower replacement m
Electronics Forum | Mon Oct 16 16:01:42 EDT 2006 | timnop
I have a wave machine (offshore made) with internal spray fluxer configured with a conventional spray gun set up. In order to spray fluid (in this case, flux) I must set the air pressure at 0.3 mPA (43 PSI). At that pressure, my flux sprayer creates
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