Patrick you may want to contact ACI Technologies. 
http://www.aciusa.org/ 
They support the Navy and Army on many legacy projects and could be a good
resource for you.

Best regards,





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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Sunday, May 01, 2011 1:12 AM
To: [log in to unmask]
Subject: [TN] Repair / Rework on non-in-house RoHS compliant boards

As a technician that does frequent board level repair rework some
questions have come to mind.   While the majority of my work is legacy
i.e. vintage (1968) we will face these concerns in the near future.  The
boards I primarly work on are Nuclear graded Class IE, (high reliability,
seismically qualified, etc.) high dollar boards, typically in the 3-10g
range and are not throw-aways, most have components that are no longer
manufactured. 
I am looking to the industry to find best practices, this is one of the
places that was suggested for posting.   Any help you can give me would
be appreciated. 

With pre RoHS solders most if not all of major manufacturers used 63/37
solders and repair rework was easy, one just used 63/37. 

With the adoption of RoHS controls and the subsequent use of many different
alloys of lead free solders, (at least 6 I know of), the following comes to
mind:
1. Are there compatibility issues mixing between the various alloys of
lead-free employed currently in electronics manufactures?   In strength
and reliability primarly. 
2. How does the technician determine the correct alloy of lead-free solder
to use? 

3. How does the technician determine what alloy was originally used by the
manufacturer? 

4. Will IPC 7711A / 7721A standards be updated to delineate alloy
determination and / or an alternate methods for the complete removal of
lead-free solders and subsequent repair using 63/37 or lead-free alloys?
Pat Goodyear
Control Technician
Pacific Gas and Electric Company
Diablo Canyon Nuclear Power Plant
PO Box 56
Avila Beach, CA. 93424
805-545-4312 


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