Electronics Forum | Mon Nov 25 09:34:52 EST 2002 | davef
You're correct excessive temperature can cause dewetting, but that usually means realeeee hot. Excessive time at above liquidous will cause dewetting also.
Electronics Forum | Thu Mar 27 11:49:18 EST 2003 | kenlchin
In printing,the thickness of solder paste perpendicular to the Squegge direction is always lower 1 mil than that parallel to the Squegge direction,so Insufficient Solder may occur.I think you may slow printing speed or widen appertures to resolve it.
Electronics Forum | Tue Jan 13 07:44:48 EST 2004 | Chris Cottreau
Upon inspection were seeing most if not all of these SOT 23 are not reflowed properly. The components just sit on top of the solder, this is creating insufficients, poor wetting, etc. There are about 25 SOTS per board, 2 boards per panel creating alo
Electronics Forum | Mon Feb 02 12:36:41 EST 2004 | paul_bmc
90% of the assemblies our company produces are class 3 and we have no problem at all inspecting or getting class 3 quality through reflow. Rarely do we have touch up because of insufficient or poorly reflowed solder joints. What are the problems you
Electronics Forum | Fri Sep 17 08:31:01 EDT 2004 | patrickbruneel
Adam, If you use the chipwave on that board, eliminate the chipwave on one board and see if this eliminates the problem with the insufficient solder on the connector. Regards, Patrick
Electronics Forum | Tue May 03 15:15:33 EDT 2005 | dphilbrick
The biggest problem is getting paste on the board. We ran a board that had 8 per and would get an occasional insufficient solder joint. I would look into doing the boards with something like a SiPad process (www.sipad.net) My $0.02
Electronics Forum | Thu May 26 21:09:01 EDT 2005 | thaqalain
The reliability of a Gullwing component solder joint is in question when insufficient solder is evident: *at the heel of the lead *at the toe of the lead *none of the above
Electronics Forum | Thu May 26 21:16:54 EDT 2005 | thaqalain
A solder connection that is characterized by the presence of solder beyond the connection area is called: *Excessive solder *Insufficient solder *Open Solder Joint
Electronics Forum | Tue Jun 07 20:19:31 EDT 2005 | davef
That depends a great deal on what you are cleaning and how clean do you want to get the substrate. We've seen cases where 0.1 uS-cm was insufficiently good and others where 10 uS-cm was more than sufficient.
Electronics Forum | Mon Aug 01 08:38:57 EDT 2005 | kamrant
Joseph, What is the topside temp reading of your board before reaching the pot? Do you have top-heater in your wave machine? It sounds like; you got an insufficient per-heating issue.
