Electronics Forum | Wed Apr 21 22:15:12 EDT 1999 | Chris
| I'm having problems with trying to get a good solder joint using a Ceramic PCB. We are using AMTECH hi-temp solder (ws-486 96.5/3.5ag). My profile looks great and I used the recommended profile from Amtech with a few adjustments. My max temp is abo
Electronics Forum | Wed Aug 24 09:42:23 EDT 2005 | james
That is what I was looking for. The profiles did not make much sense to me. We are getting alot of cold solder joints or bumpy solder joints.
Electronics Forum | Mon Mar 01 10:27:08 EST 2010 | wrongway
I don't think I would reduce the heat at all if there is no vibration in your oven or on the chain you should have no problem with them falling off or moving but you sure don't want a cold solder joint you no the solder joints are so easy to see go
Electronics Forum | Tue Jan 16 03:05:32 EST 2007 | aj
All, The component that seems to be effected most is a : NemeriX NJ1006A QFN type device. If heat isthe problem what exactly is happening to the part -cold spots? joints not soldered? aj...
Electronics Forum | Thu Mar 06 15:33:42 EST 2008 | realchunks
I hear that. A 2002? You poor b-stard! That's like having cold solder joints! (Gotta keep it related)
Electronics Forum | Tue Feb 10 02:14:39 EST 2009 | emmanueldavid
Smartasp, Seems this issue is certainly making a long thread ! As far as our Experience is concerned on Reflow Soldering, particular parts must have failed in LSLs [Lower Specification Limit] and have not withstand well under USLs [Upper Specificat
Electronics Forum | Mon Jun 18 16:48:00 EDT 2001 | Gil Zweig
We have found a significant number of PBGA problems associated with physical deformation of the package. Deformations such as dishing (potatoe chipping) and delamination under the die (popcorning). These can be detected by x-ray by the variation patt
Electronics Forum | Thu Mar 25 12:24:12 EDT 2010 | ssager
When testing components on a PCBA, try to validate coverage for presence, correct, orientation, live, and alignment. AOI is not really great at catching cold solder joints and damaged components, and from my experience an X-Ray is only as good as the
Electronics Forum | Wed Nov 21 09:37:52 EST 2007 | swag
Maybe you're not be getting all the flux removed in your wash process and your customer thinks the degraded solder joints look cold???
Electronics Forum | Thu May 10 08:09:52 EDT 2007 | davef
There is no standard for time above liquidus. It is described rather broadly by the solder paste supplier. Reflow Zone: If the temperature is too high, boards may char or burn. If the temperature is too low, cold and grainy solder joints will resul