Electronics Forum | Fri Apr 18 14:44:56 EDT 2008 | jax
Saunders Technology... or ECD (makers of M.O.L.E.) has what is called a TEMPROBE that will work how you want... even in "wet" solder paste. Maybe others here can tell you if it works well or not, I use KIC. www.ECD.com/saunders/tp.htm
Electronics Forum | Wed May 14 13:45:05 EDT 2008 | realchunks
Aaaah, I didn't know you washed in between. Sounds like you solved your own question.
Electronics Forum | Thu May 22 14:44:10 EDT 2008 | samir
Does your top-side preheat NEED to be that high, and so high that you are exceeding the flux manufacturers' spec? If so, what is the reason? Top-side wetting? Are you measuring this temperature at the substrate or solder joint?
Electronics Forum | Tue Jul 08 10:41:14 EDT 2008 | aj
Hi all, I was carrying out some trials and the attached image is something that puzzled me . What would be the cause of this ? is it excess volume ? poor wetting? aj...
Electronics Forum | Thu Jul 10 22:34:34 EDT 2008 | davef
We wouldn't get our underware in a knot about poor wetting on a lead that is not connected to the board. IPC standards seen to say that the inspector should use common sense in interpreting standards requirements. Then again, it's not all that common
Electronics Forum | Mon Jul 28 10:58:34 EDT 2008 | davef
Search the fine SMTnet Achives for background discussion on dewetting, like: http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=12840&#Message54734
Electronics Forum | Fri Aug 08 09:49:17 EDT 2008 | scottp
We've seen the exact same problem. The solder joints had negative wetting angles and x-sections show that the PdAg termination dissolved into the solder. We no longer allow PdAg terminations.
Electronics Forum | Mon Aug 18 15:18:08 EDT 2008 | realchunks
Open the same size as the via's anular ring. Any slight off print will wet its way back into the via hole.
Electronics Forum | Wed Aug 27 15:48:05 EDT 2008 | grics
Again, our paste manufacturer specifies TAL to be 30-60 seconds. Out of curiousity, how would part placement cause de-wetting? I am fairly new to SMT so elaboration would be helpful... Thanks
Electronics Forum | Fri Aug 29 10:18:31 EDT 2008 | rrpowers
We saw this one time when we were trying to develop some lead-free product. It ended up being copper migration. Some of the pads had a brown discoloration and those that did would not wet very well. Your elemental analysis would have shown if ther
