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July 1999

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Subject:
From:
Kenneth Kirby <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 28 Jul 1999 14:58:11 -0500
Content-Type:
multipart/mixed
Parts/Attachments:
text/plain (2522 bytes) , pic27529.pcx (2490 bytes)



I don't belive that you will find any long term relability studies on
dewetting because no one in there right mind would ever send these boards
to a customer to see how long a known defect would last.  You can however
have some joints micro sectioned to determine if they are indeed good
joints.  But again this is just going to tell you what you already know,
(That you have a board solderability problem).  I hope that your upper
mangement will understand that the engineering and quality groups are
responsible for the process specifications and quality of the board, NOT
purchasing.  Good luck and I belive that all on the technet will agree that
you are correct and these boards are rejects.

Ken Kirby




 (Embedded
 image moved   Kathy Palumbo <[log in to unmask]>
 to file:      07/28/99 12:12 PM
 pic27529.pcx)




To:   [log in to unmask]
cc:    (bcc: Kenneth Kirby/ElectrovertUS/Cookson)
Subject:  [TN] Dewetting Issues




Currently we are experiencing a lot dewetting issues on our HASL coated
boards.  When tested in house they failed IPC solderability testing, and
when tested at two outside independent labs they failed solderability
testing at both labs.  The problem we are having is our purchasing
department still thinks we are full of it and will not support us in
returning the boards to the board house, and naturally the board house is
taking our purchasing departments side and will not take the boards back
now.

Both our purchasing department and the board house are claiming "there is
no
long term reliablity issues with dewetting".  Naturally my M.E. and Q.E.
group disagree with their statement.

What I am looking for is long term reliability studies regarding dewetting
on typical HASL coated FR4 PCB material.  Does anyone out there know of any
such studies, or can you steer me in the right direction?

Thanks for you help in advance!

Sincerely,
Kathy Palumbo

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