Hi Judy:
     
     Solder joints are solder joints - a reliable solder joint should not 
     be process specific although some processes are more suited to making 
     certain solder joint geometry's than others. The heel fillet is a 
     critical location for good solder joint reliability. I think that 
     meeting the "standard" requirements is not the issue - does the heel 
     fillet you end up with provide the reliability needed for the use 
     environment that you are in? If it does then document those facts for 
     internal or customer review. I would also suggest that you forward 
     that documentation/information (if you are allowed) to the IPC 
     ANSIJ-STD-001 committee so that the information can be incorporated 
     into the specification.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: FWD>assy: hot bar solder jo
Author:  [log in to unmask] at ccmgw1
Date:    7/10/96 7:26 PM


this meesage is being forwarded from a co-worker,
     
the solder joints that we are forming with our hot bar process are not meeting 
the requirements of 'standard' workmanship criteria.  in particular, we have a 
difficult time meeting 'heel fillet' requirements.  the defect is one of 
'insufficient solder' at the heel fillet.  it isn't that there isn't any heel 
fillet; it's just that it isn't as pronounced as the standards require.
     
question.-  are there solder joint standards specific to hot bar soldering?
     
thanks,
     
phil crepeau, trw-san diego
     
Judy Murray
TRW San Diego
619.592.3616
[log in to unmask]
     
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