Hi Everyone!
Well, I finally got Pat's picture up! The reason it's taken me so long is
because I'm back home in North Carolina, and the only internet access I have
is dial-up at a screaming 26.4 KB per second! I remember not that long ago
that was fast. But once you get used to a DSL or T1 connection, well that's
just dog slow.
Anyways, here's Pat's picture:
http://www.stevezeva.homestead.com/files/solder_anomaly2.JPG
To me that doesn't look right. I've soldered with a Sn62/Pb36/Ag2 paste
before and soldered lead-free components on a ENIG board and the joints
didn't look that rough. That's more than just cooling lines IMHO...
-Steve Gregory-
----- Original Message -----
From: "Diamond, Pat" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, November 27, 2006 2:12 AM
Subject: [TN] Soldering Anomaly
> Hi Technetters,
>
> We have recently received some assembled boards from a new supplier and
> upon
> carrying out a First Article Inspection on them I noticed what I thought
> were disturbed solder joints. I then referred to IPC-610 which seemed to
> confirm this. Upon talking to the supplier about this problem they said
> that this was not disturbance but "cooling lines" due to the fact that the
> component leads were lead-free and the solder paste was Sn62/Pb36/Ag2.
> They referred me to IPC-610 Para. 5.2.7 Fig. 5.56 (page 5-18) which looks
> nothing like the joints on our components. The only area this anomaly is
> occurring is on the SOT 23 Transistors & Diodes.
> Our company is not a main line SMT producer and I have never seen this
> anomaly before.
>
> I have contacted Steve Gregory and he has kindly agreed to post a couple
> of pictures on his website for me, see what you think.
>
> I really hope they are cooling lines!!!
>
> Thanks in advance for any help/advice you can offer.
>
> Best regards,
>
> Pat
>
>
> ****************************************************************************
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> ***************
> Mr Pat Diamond
> Senior Specialist Engineer
> Weston Aerospace Tel: +44 (0)1252 868122
> 124 Victoria Road Fax: +44 (0)1252 370298
> Farnborough, Hampshire, GU14 7PW Web www.westonaero.com>
> England Email mailto:[log in to unmask]
>
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