Randy,
     
        As you are likely aware, IPC-A-610, section 4.2.2 states that "When 
     lead cutting is performed after soldering, the solder terminations 
     shall either be reflowed or visually inspected at 10X to ensure that 
     the original solder connection has not been damaged, (e.g. fractured), 
     or deformed."
     
        My research has revealed that experts are divided on the need to 
     re-solder the joint after cutting.  In practice, our company opts not 
     to re-solder and has built well over 200,000 assemblies without any 
     reliability issues.  The assemblies are thoroughly tested as well.
     
     
     - David Bruni


______________________________ Reply Separator _________________________________
Subject: ASSY: Lead Trim After Wave
Author:  [log in to unmask] at cc_gate
Date:    11/13/96 5:51 PM


Is there a consensus one way or another on the practice of clipping 
component leads after wave in regard to the effect on solder joint 
reliability and the effect on reliability of leaving the clipped ends 
untinned?  The level of reliability expected is Class 3.
     
Thanks
     
Randy Johnson
Reliability Engineering
Woodward Governor  Company
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