Electronics Forum | Mon Mar 12 10:29:07 EDT 2007 | george
Are you using wave solder pallets? I use same flux and solder as you do. I've seen this problem when some walls in the wave fixture cause a "shadowing effect"...if you enlarge those openings you will increase the dwell time eliminatting voids (if the
Electronics Forum | Mon Mar 12 11:53:52 EDT 2007 | realchunks
Hi Coop, Sounds like you are having top side wetting issues. Generally this is flux related, but with a foam fluxer, I'd kinda doubt it's the fluxer. Could be heat related as well. Try slowing the conveyor speed to verify. Long leads - hmmmmm.
Electronics Forum | Mon Mar 12 09:55:55 EDT 2007 | coop
I am aware of the IPC A-610 standards on acceptability of electronics, but this place builds our products to an even higher standard. the problem is on the two leading corners of the IC's as they go into the wave.
Electronics Forum | Fri Mar 09 12:41:56 EST 2007 | coop
I have recently been handed over the waving operation here, and am unclear on how to address our recent issue with our Wave. We are using AIM WS-715M Flux in a Foam fluxer, and are using AIM SN-100C in the wave. The problem is on several of the assem
Electronics Forum | Mon Mar 12 14:23:41 EDT 2007 | davef
Naw, lead forming is unlikely to be the source of the problem, because it only affected two leads.
Electronics Forum | Mon Mar 12 13:57:50 EDT 2007 | davef
That your problem is not related to component solderability or wave process related makes us believe this has to do with bare board design. Look at how your designer did the thermal relief on the two pins that don't solder well. If you can't get a
Electronics Forum | Mon Mar 12 11:27:35 EDT 2007 | coop
I am not using a solder pallet, I don't think the problem is contamination related, because these parts are on some of our other assemblies, and they're being waved with no problems. The problem seems to be mainly on our panelized boards for some rea
Electronics Forum | Mon Mar 12 08:27:00 EDT 2007 | rgduval
Have you checked the parts for contamination? Are the voids out of spec? IPC allows some voiding, especially with lead free solder. Component contamination can cause this to repeat, as well. Try pre-tinning the component in question, and see if s
Electronics Forum | Mon Mar 12 14:08:03 EDT 2007 | coop
Thanks to all for the input I will try the preheating the "blank" out of it too. the preforming Idea I had wasn't the problem. I'll slow down conveyor speed and increase the preheater temp.
Electronics Forum | Mon Mar 12 17:16:45 EDT 2007 | coop
the problem must have been the ground plane like you were saying because I increased the preheater temp, slowed down the conveyor speed and they started looking better. Thanks to all for the input, especially davef. Thanks again
