IPC-600-6012 Archives

August 2010

IPC-600-6012@IPC.ORG
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Subject:
Re: opinion poll
From:
"Byrne, Matthew J (US SSA)" <[log in to unmask]>
Reply To:
(Combined Forum of D-33a and 7-31a Subcommittees)
Date:
Tue, 17 Aug 2010 08:53:47 -0400
Content-Type:
text/plain
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text/plain (53 lines) 
The possibility of a separation at the knee between plating layers needs to be evaluated without microetching the cross section mount.  If no separation is found then no defect should be called out.  Microetching helps in failure analysis.


Matt Byrne
Manufacturing Engineer, PWB Technology
BAE Systems, Room 795
600 Main St, Johnson City, NY 13790
607-770-2267
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-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Brown, Elaine
Sent: August 17, 2010 6:27 AM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] opinion poll

It is non-conforming for both the crack and the plating separation.
The second picture is not so clear cut.  If indeed the area at the knee is separation it is rejectable. 
If it is differential microetching, it is not.  Hard to tell from the photo. 
I do not think we have any criteria for burning.    

Elaine

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, August 16, 2010 1:19 PM
To: [log in to unmask]
Subject: EXTERNAL: [IPC-600-6012] opinion poll

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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