Hi Graham - Please find out what flux (i.e. product name: Kester XXX or 
Alpha YYY or Indium ZZZ, etc.)  the component fabricator used in his test. 
Also find out which solderability specification did they use 
(IPC-JSTD-002C or MIL-STD-XXX) and which solderability test method did 
they use (Method A or B or...). If you can get those facts, I can tell you 
if they followed the specification requirements. My guess is that they 
used an incorrect flux.

Dave Hillman
JSTD-002 specification Chairman
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Graham Collins <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
02/06/2009 08:12 AM
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[TN] Part solderability






Hi guys.
A while back I rejected a bunch of parts due to non wetting when we went 
to solder them. 

The manufacturer has come back with a response to our guys, saying that 
they did a steam aging test on them and they passed fine.  He wants to 
discuss it with us.

Obviously this is not good - they pass his test but I can't solder the 
things.  Which makes me suspect his test... but makes him suspect my 
process.  I don't know enough about steam aging tests to discuss this 
well.  Obviously I need to ask what kind of flux he is using, but anything 
else?

Our process is SnPb, we use RMA flux, and the wave soldering machine runs 
at 500F for the pot.  This is on an assembly that we have happily built 
for about 7 years, with the same manufacturer of part, and no process 
changes that I can identify as significant.  The part is what I would call 
marginally solderable, if we hand solder it and put a fair bit of heat to 
the lead we can get it to solder, but not well or easily.  No previous 
soldering issues with the part.

regards,
 
Graham Collins
Halifax Production Engineering
L-3 communications Electronic Systems
(902) 873-2000 ext. 6215


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