This month started with concerns about passives not having bright silver
shiny solder connections (and we all know that is a thing of the past), and
now we have grapes.
We don't have any failures at all related to either of these two cosmetic
issues, and there are a myriad of surface finishes involved altogether.
My response, so far, has been to stick to IPC terms and
definitions........and from what I have seen so far, the connections
exhibit acceptable wetting so this is purely a cosmetic issue for now.
The root cause, according to some sources is supposed to have to do with
exhaustion of the flux vehicle during reflow...but that is contradictory to
the second theory offered that the time at reflow was not long enough to
allow proper melting.
I will keep you posted as I "learn" more. BTW, it is Friday in China.
At 01:22 PM 12/13/2007 -0800, Miguel Vallejo wrote:
>Poor wetting seems to fit the bill, why call it something else..?
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Dale Ritzen
>Sent: Thursday, December 13, 2007 11:56 AM
>To: [log in to unmask]
>Subject: Re: [TN] "Grape-ing"
>
>See attached CircuitNet answer (Ask the Experts) by Neil Poole for
>definition (beings as it's not Friday yet)...
>
>http://www.circuitnet.com/articles/article_40078.shtml
>
>Dale Ritzen
>Quality Manager
>Austin Manufacturing Services
>
>-----Original Message-----
>From: Stadem, Richard D. [mailto:[log in to unmask]]
>Sent: Thursday, December 13, 2007 1:05 PM
>To: [log in to unmask]
>Subject: Re: [TN] "Grape-ing"
>
>
>Never heard of it. If your paste supplier is educating you, shouldn't
>you be enlightening us?
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Phillip Bavaro
>Sent: Thursday, December 13, 2007 5:06 AM
>To: [log in to unmask]
>Subject: [TN] "Grape-ing"
>
>My solderpaste supplier is educating me regarding a defect called
>"grape-ing".
>
>Anyone care to shed a little light on this soldering defect?
>
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