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February 2009

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Fri, 6 Feb 2009 08:16:53 -0600
Content-Type:
text/plain
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text/plain (66 lines)
Hi Graham!

What kind of parts are these? Have they changed the plating recently on
them?

Steve 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Friday, February 06, 2009 8:12 AM
To: [log in to unmask]
Subject: [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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