IPC-600-6012 Archives

August 2010

IPC-600-6012@IPC.ORG
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Subject:
Re: opinion poll
From:
Lance A Auer <[log in to unmask]>
Reply To:
(Combined Forum of D-33a and 7-31a Subcommittees)
Date:
Mon, 16 Aug 2010 10:35:18 -0700
Content-Type:
text/plain
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text/plain (52 lines) 
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

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