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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