Electronics Forum | Thu Jul 14 16:15:04 EDT 2005 | russ
Can flux really prevent wetting? This seems odd to me. I am actually thinking the opposite of Bman, I am wondering if using a homeplate with an overprint condition might help? Russ
Electronics Forum | Tue May 28 13:25:57 EDT 2002 | zanolli
Hello Anthony, The amount of solder that the process is capable of applying is the biggest limitation. I believe that solder paste is only approx. 50% metal by volume. When connectors are soldered in intrusive reflow, often the stencil is "overprint
Electronics Forum | Thu Jul 26 01:50:17 EDT 2001 | mugen
We gave standing order, if its past the expiry date, ditch the can/jar, get a new can/jar.... Visual confirmation, for previously open & recycle can/jar, if you see seperation, of yellowish flux floating above, goolie grey much beneath, then ditch i
Electronics Forum | Thu Oct 04 15:11:39 EDT 2018 | emeto
1. From your explanation it looks like you need more flux. Try to overprint a little or use 150um thick stencil 2. You should consider a little different profile - probably try to have a soak zone in the right alloy and flux range and give the part t
Electronics Forum | Thu Jul 18 15:08:36 EDT 2024 | SMTA-64416281
We have an application requiring more than a single preform per component (PIP through hole socket). What we found out is that regardless of how much you overprint, the flux contained in the paste is not enough, so we ended up needing to dispense gel
Electronics Forum | Tue Jun 11 14:58:45 EDT 2002 | Chris Lampron
Hello Sean, We are currently using a Pin in Paste process to mount some through hole relays. This particular board has 72 relays per. We have cut the stencil to overprint the hole. By putting a small amount of solder in the hole to flux the lead, th
Electronics Forum | Wed Dec 06 08:29:50 EST 2006 | David
Hi Pavel, We regularly use over printing on a multitude of problem parts including fine pitch QFP's. In an Automotive Environment the only thing you can change without a mountain of paperwork is the stencil. best way to work out how much you can get
Electronics Forum | Thu Dec 07 10:05:18 EST 2006 | Learn from U
Hi all, Sorry for the late reply..I am sure it is flux residue..Found no such symptom as Grey mention above. This is non clean process and no way we can clean this whole big board(Server) with any kind of flux removal...Currently, the ICT probe pre
Electronics Forum | Thu Jun 29 06:26:36 EDT 2006 | AR
Hi Slaine, The terminations are still present on the component but all the solder (including the pad finish) has coalesced on to the terminations. The termination that normally is shiny and bright in colour has turned matte grey on that zone where t
Electronics Forum | Wed Feb 02 11:48:48 EST 2000 | Christopher Lampron
Dave, Ashok mentioned that the end termination of the component were dull and grey. I have had similar problems with Murata components exibiting the same characteristics on the end terminations. As it turns out, they have some exotic plating material
.gif)
