Hi Diamond:
If it happens around some parts only, it may not be
the board but the component. Something like that happened to us except
the lines were thinner and a lot more of them. If you touch them up and
they smooth up, it may be like your vendor says cooling lines. You may
want to take a board and have the solder on those joints checked for
contamination and compared to a good joint.
Regards,
Ramon
Why is it that when we share out thoughts we give our two cents and when
someone wants to know what we think, they are willing to pay only one
penny? Is it because some people are cheap?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Diamond, Pat
Sent: Tuesday, November 28, 2006 3:10 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering Anomaly
Hi Wayne,
apologies to you and the rest of the forum for not clarifying, the mark
you can see is a probe mark from the supplier testing (separate issue),
this was the best picture I could get in the time available.
regards,
Pat
-----Original Message-----
From: Wayne Thayer [mailto:[log in to unmask]]
Sent: Monday, November 27, 2006 5:57 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering Anomaly
Pat-
What the devil is that thing in the very center of the photograph? Is
it a projection? Looks like it projects out and leans to the
right--kind of looks like a silver pony tail, and it looks like the
solder is backed off from it.
Please clarify.
Wayne Thayer
>>> [log in to unmask] 11/27/2006 12:23 pm >>>
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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