Electronics Forum | Wed Mar 15 09:21:40 EST 2006 | vicknesh28
Thanks for the input. Just one question. Is what i am seeing normal? I am refering to the flux being between the lead and molten paste after the reflow process. This only found on a non-wetting lead.
Electronics Forum | Wed Mar 15 11:19:43 EST 2006 | slthomas
Based on that criteria I would also guess profile but as has been stated, you don't really know w/o profiling.
Electronics Forum | Wed Mar 15 11:27:05 EST 2006 | stepheniii
By any chance is it eutectic paste and pallidium leads? Also how tight are you checking coplanarity? At least with the MPA-G3 you can check so tight that any IC will fail in the real world. Or you can check so loose that you might as well not check.
Electronics Forum | Wed Mar 15 13:25:25 EST 2006 | russ
Your profile is definitely off. It could be bad leads but it sounds like your max temp is too low and the TAL is too short. By how much? Don't know.
Electronics Forum | Thu Mar 16 04:35:49 EST 2006 | vicknesh28
Paste is eutectic and it's copper based parts. Just another observation, i notice that the "flux" between the bottom foot and solidified paste is still in gluey state. Observation on good reflowed leads showed brittle type of flux residue. Can anyone
Electronics Forum | Fri Mar 17 09:32:45 EST 2006 | vicknesh28
It's a no clean paste. Yes it's a single lead (sometimes a few at random locations) and i do notice that corner leads (or close to it) fails more.
Electronics Forum | Thu Mar 16 10:19:15 EST 2006 | slthomas
Is it possible that the other facility you were at was running a WS paste more or exclusively? We found that the nc Kester left us with a lot more sticky mess than the ws. That said, are you sure you're also getting enough exhaust airflow?
Electronics Forum | Thu Mar 16 14:24:54 EST 2006 | cyber_wolf
Find out what the exhaust draw requirements are and talk to a HVAC expert. They should be able to tell you what size fans and duct work you need for your oven. They can also calculate how much draw you have with your current set up.
Electronics Forum | Wed Mar 15 10:44:51 EST 2006 | Jim
How long is each heating cycle? Can you provide dimensions on the cards in a rack? In other words, what is the loading area you are looking for(LxWxH)?
Electronics Forum | Wed Mar 15 10:52:27 EST 2006 | John
168 hour cycle time typical. The customer does not care if the door is opened to load more cards etc. The cards are 6x8 typical.
