Electronics Forum | Thu Oct 25 08:19:53 EDT 2001 | Dave G
Sounds like somthing disturbed the solder joint while it was @ liquidus. Could the part/leads be moving on the 2cnd pass ?
Electronics Forum | Thu Jan 03 07:38:01 EST 2002 | davef
Scott is correct. Expanding a bit, the SMTnet Library has a "Terms & Definitions" listing in the "Standards & Terms" section.
Electronics Forum | Thu Jan 03 07:49:20 EST 2002 | hany_khoga
Thanks Scott: The Assembley is Mixid ( reflow then wavesoldered). It is One curcuit. Is the Tg averagely known for FR4 PCB assemblies? Hany
Electronics Forum | Thu Jan 03 08:44:08 EST 2002 | davef
The Tg of the resin commonly used in FR-4 is 140�C. Consider checking with your supplier to better understand the specific materials used in constructing your board.
Electronics Forum | Mon Jan 28 07:48:18 EST 2002 | cnotebaert
Did you perform a cleanliness test on the boards? did it pass? if yes whats the issue? visual attributes like this will not effect form fit or function of the device. Finding this under 30X, wow, why 30X????
Electronics Forum | Mon Mar 04 18:53:42 EST 2002 | babe
I have documentation from many companies on a hand lotion that passes all of the critical tests required in handling of PCB's. If you wish I could copy or have the manufacturer send this information your way. Steve
Electronics Forum | Thu Aug 22 02:18:09 EDT 2002 | mjabure
Specify the nozzle size as 1.4 in both the nozzle allocation table and the PD, the nozzles will still pass center test as the size variation is still within tolerence.
Electronics Forum | Fri Aug 23 18:51:00 EDT 2002 | edahi
weve done a few evaluations for the no-flow underfill and for the reliability I think it has already passed MRT L3 @ 220C reflow. What is it specifically you're interested about the flow u/fill??
Electronics Forum | Tue Sep 17 07:08:51 EDT 2002 | cyber_wolf
The only place I ever used my SMTNET E-mail is through a couple of E-mails I sent to people that use this site. I sincerely hope that the used equipment guys are not passing out our E-mail addresses. Thanks for the response.
Electronics Forum | Wed Oct 09 12:24:11 EDT 2002 | dphilbrick
Why not go to VOC free flux. It is a water based no clean. Clean it when you need to and leave it when you don't have to clean. We have used it for several years. We do Military and Commercial - passes for all so far.
