Electronics Forum | Fri May 12 08:58:04 EDT 2023 | tommy_magyar
This is a defect in all IPC classes. Solder has not wetted to the land where solder is required.
Electronics Forum | Thu Sep 07 09:08:57 EDT 2006 | Bubba
OK, part touching paste before reflow? Check part. Maybe bad plating. Check reflow profile by slowing conveyor.
Electronics Forum | Thu Sep 07 10:39:34 EDT 2006 | vicknesh28
Can u elaborate on the bad plating? Have u had any experience on this before? The component has 90/10 Tin lead plating
Electronics Forum | Thu Sep 07 14:43:33 EDT 2006 | davef
Questions are: * So after you spot one of these leads sitting on a nice pillow of solder, what happens? * Do you rework the part? * Does it take solder? * What do you do to make it take solder, if it does take solder?
Electronics Forum | Fri Sep 08 08:00:41 EDT 2006 | davef
That's your clue. Your reflow is running ~240*C and your soldering iron is running ~370*C. Dial-up the heat.
Electronics Forum | Thu Jun 29 04:50:42 EDT 2023 | SMTA-70263692
This looks like it could be related to oxidation.Do you per-bake your pcb before assembly to remove any moisture inside your board panel?
Electronics Forum | Thu Jun 29 10:53:30 EDT 2023 | matouschekd
Repairing these PCBs was not an option due to the delivery amount. Oxidation is unlikely, as these anomalies were visible right after unpacking them and the humidity card was not suspicious. We have since decided not to use these PCBs as the risks w
Electronics Forum | Thu Sep 07 10:32:12 EDT 2006 | slthomas
Is the solder reflowing on the pad but not wicking up the lead, or does there appear to be insufficient solder to wet both, or is it not reflowing at all, or.....? Have you verified your profile? What is the condition of your paste (expiration date,
Electronics Forum | Thu Sep 07 07:41:06 EDT 2006 | Bubba
Check for coplaner leads if this just exists at reflow process, i.e. look at part before oven, turn on 3D at placement machine. If you see after wave solder, the wave could cause coplanarity issues on top as well if you are going slow enough to refl
Electronics Forum | Fri Sep 08 10:23:38 EDT 2006 | slthomas
By profile (profile has not been changed) are you referring to the oven zone settings or the actual charted profile of a trip through the oven as recorded by a thermal profiler? Some ovens will continue to function without warning as long as temps
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