Can't tell a lot from a single picture, but that little spur on the side
of the solder joint makes me think someone is doing solder touchup
without benefit of flux.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849
Sent: Monday, November 27, 2006 11:23 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering Anomaly
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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>
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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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