Agree,
1
should be patented, this should extend life of the joints tremendously,
especially with the upper bubbles locations.
2
it's unlikely steam, moisture is usually more volatile and blows,
i'd say Ryan and Hans are closer to it,
it's a "slow" reaction, would bet on the paste too.
3
Apart from the puzzle, little to worry about .
Perhaps lift the temps 5-10'C, go slower, ?
paul
nice shots Franklin, thx
-----Original Message-----
From: Hinners Hans Civ WRALC/LYPME [mailto:[log in to unmask]]
Sent: Tuesday, 29 August 2000 5:43
To: [log in to unmask]
Subject: Re: [TN] Bubbles in through holes
Hi Franklin,
I have question.
Could the bubbles have been caused by volatiles in the flux not being
completely driven off? I remember reading something about this recently
either in Coombs or an old Machine Soldering Workshop.
Hans
~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials Engineer (Process & Manufacturing)
Warner Robins Air Logistics Center
Avionics Production Division
Precision Attack/Radar/Manufacturing Branch
Engineering Section
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (478) 926 - 1970 Fax: (478) 926 - 7164
mailto:[log in to unmask]
http://www.robins.af.mil
-----Original Message-----
From: Franklin D Asbell [mailto:[log in to unmask]]
Sent: Monday, August 28, 2000 10:38 AM
To: [log in to unmask]
Subject: [TN] Bubbles in through holes
Help...
A customer has brought a problem to our attention. The yare experiencing
'air bubbles' in through holes after wave soldering.
The copper plating in the hole is averaging 1.25 mils, we have not seen
any compromised hole walls, only bubbles, they even extend up and out of
the hole next to the component leads.
I have uploaded pictures on our website, any assistance would be
appreciated.
These boards were fabricated here in Texas 13 months ago, the customer
did not bake the boards prior to processing. Thanks
You can view these pictures at this link:
http://www.networkcircuits.com/technical.htm
Franklin D Asbell
Network Circuits, Inc.
Irving, Texas 75061
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