Chris,

The second picture is clearer and I have to agree that it looks like it 
was burnt.

Gary

On 8/16/2010 1:40 PM, Chris Mahanna wrote:
> Hi Lance,
> No solder
> Let me add another picture to the story.
>
> -----Original Message-----
> From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Lance A Auer
> Sent: Monday, August 16, 2010 1:35 PM
> To: [log in to unmask]
> Subject: Re: [IPC-600-6012] opinion poll
>
> Chris,
>
>          I think your picture shows an "E" crack and the initial plating
> has separated from the copper that was subsequently plated.   Is that
> solder in the area where the platings are separated?
>
> Thanks,
> Lance
>
>
>
>
>
> From:
> Chris Mahanna<[log in to unmask]>
> To:
> [log in to unmask]
> Date:
> 08/16/2010 10:21 AM
> Subject:
> [IPC-600-6012] opinion poll
> Sent by:
> IPC-600-6012<[log in to unmask]>
>
>
>
> Hi Everyone,
>
> Attached is a picture of a thru-hole corner after thermal stress.  The
> plating is pulse.  I believe the corner was 'burnt' because of the
> geometry of the (conformant) negative etchback.  All the corners show
> burn; some show blisters; only this one cracked.
>
> In your opinion, what are the non-conformance(s) if any?
>
>
> Thanks
>
> Chris
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________[attachment
> "corner.jpg" deleted by Lance A Auer/US/Raytheon]
>
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________