Good question, not sure though. They were present here when we flux
coated and then soldered the sample boards from their inventory and
nothing was mentioned. I'll forward your question along to them.

Thanks,

Franklin





Hinners Hans Civ WRALC/LYPME wrote:
>
> 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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