Electronics Forum | Thu Jun 16 08:31:15 EDT 2005 | jh0n!
The most part I have the most difficulty with is a 16mil QFN. We found that reducing stencil thickness to 4mil, and reducing aperatures for the IC by 20%, and setting local fiducials to the IC helped immensely. We used to get 75% or more bridged ou
Electronics Forum | Sat Nov 05 07:33:14 EST 2005 | milroyperera
Hi, I see that the wave angle of the wave solder machine takes a major part on soldering SMDs if they are assemlbed with glue. To avoid the shadowing effect and bridging what would be the best angel of the wave for Sn/Pb & Pb-free soldering processs
Electronics Forum | Mon May 01 14:30:14 EDT 2006 | marvindamaniac
I know from previous experiences that off contact printing have helped us reduce bridges and smears under the stencil. I am looking for ANY documentation regarding this topic in order to try to implement a change at our current factory. If anyone ha
Electronics Forum | Fri May 12 12:07:10 EDT 2006 | solderiron
The kester better known as KY'd Sn/Cu has more copper intermetallic growth over time, dissolves copper from the board faster so repairing and touchup can damage board. Bridges more than SN100c. Does not thermal cycle well. Has shrink cracks that can
Electronics Forum | Tue May 16 14:05:44 EDT 2006 | Mike
Hello, Heres my take. If the ends that are touching are connected by trace, and IPC-610 is satisfied, and the connection does not make a Parallel circuit where a series circuit is required, then I would treat it as a process indicator. That is, unle
Electronics Forum | Mon Jul 17 07:05:10 EDT 2006 | Steve H.
Hi, I was wondering, if there were any guidelines to what %RH the production hall should be running within, and what consequences can occurr, if we are running higher or lower than the reccommendations. I am worried, with regards to the above, as w
Electronics Forum | Mon Jul 17 15:18:31 EDT 2006 | d0min0
Hello there, I'd love to have HR at 50-55%, but also temp at 21-23 deg C, with hot start of summer in Poland, we have on prod.floor close to 30 deg C and 30%HR, it is really difficult to print properly and to get pcb through oven without problems...
Electronics Forum | Wed Aug 23 22:31:17 EDT 2006 | darby
Nope, and, Be careful with the "grid" on your stencil for the big centre pad - I could not find the stencil recommendations. I use a similar part by Cygnal (CP2101). Next time I will reduce the apertures by 50% from their suggested layout. We had fl
Electronics Forum | Tue Nov 21 19:07:36 EST 2006 | greg york
Serious question here, why do all the Lead Free Chinese Wave Soldering machines I have seen come in set at 5 Degrees angle - It doesn't work and bridges all over the place until th eangle is changeds. Are you guys finding this? Thanks Greg York
Electronics Forum | Wed Mar 14 16:23:01 EDT 2007 | J
I am not sure Ersascope and X-Ray will tell you the results you are looking for. My experience with x-ray has proven that misalignment, voids, and bridging are really the only failures that can confidently be observed. You may have solder in place,
