Hi Victor - there has been some very good industry investigations that 
show shrinkage voids do not cause solder joint integrity issues - the NASA 
DoD Phase I/II data and a paper at APEX by Jasbir Bath come to mind 
(sorry, I am on travel so I don't have access to my database to send you 
those links). Shrinkage voids are typically found on the solder 
destination side of wave solder pwas. The big debate on shrinkage voids 
has been how to handle them from an inspection standpoint. We know that 
they don't cause a problem but they look like a solder joint crack during 
inspection. Some folks have put together some elaborate inspection 
criteria and others have just had the shrinkage void touched up. The good 
thing is that under most (not all) conditions, the shrinkage voids are not 
visible under the allowed magnification inspection criteria so inspectors 
don't "see" them. Richard post a good discussion on the dangers of using 
too much magnification and this is one phenomenon that benefits from that 
information. Note that there is ALWAYs a product use environment that can 
cause a problem but the general consensus from the industry has been no 
issues.  Hope this helps.

Dave



From:   Victor Hernandez <[log in to unmask]>
To:     <[log in to unmask]>
Date:   01/31/2014 11:09 AM
Subject:        [TN] IPC-A-610D, Soldering Anomaly - Lead Free
Sent by:        TechNet <[log in to unmask]>



Fellow TechNetters:

  Searching for more information on IPC-A-610D section 5.2.11  Soldering 
Anomalies - Hot Tear- Shrink Hole Figure 5.57.   Will these anomalies 
increase in size after additional Thermal Excursions?  Is this artifact on 
Post WAVE SOLDER?  How about POSR Reliability?

Victor,



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