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April 1997

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40:13 1997
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Subject:
Assy: Square Wire Pin Insertion Following SMT Reflow
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Richard Krug <[log in to unmask]>
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TEXT/PLAIN (22 lines) 
We have occasionally seen problems during square wire pin insertion on PCB's 
which have been subjected to SMT reflow.  We use HASL PCB's.  We have measured 
diameters using pin gages.  Some times there is a measurable diameter change and
some times there is not.  I suspect the solder is melting in the barrel of the 
hole, but I would expect the soft solder to readily deform during the insertion 
process.  Any ideas of what could be happening?  

Dick Krug
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