It looks like a mark from a metal probe or tweezer. When we send parts out for analysis we try hard to find examples that have not been touched during testing otherwise the conversation about route cause alway points to these marks.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard D.
Sent: Monday, November 27, 2006 13:26
To: [log in to unmask]
Subject: Re: [TN] Soldering Anomaly
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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> to which it is addressed and may contain confidential and/or
> privileged material.
>
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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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