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Reply To: | TechNet E-Mail Forum. |
Date: | Sat, 28 Aug 1999 11:12:31 -0400 |
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Sounds like moisture entrapment to me. A little moisture, some heat....
steam... and pop!! What temperature and how long do you bake the boards?
Were they soldered shortly after bake?
Gerry S.
----- Original Message -----
From: Stephen R. Gregory <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, August 28, 1999 10:37 AM
Subject: [TN] Blisters or Delamination after Wave...
> Hi ya'll!
>
> Well, I'm in onna Saturday...(Months end, you know how that goes!). Just
> finished waving a small lot of boards (9 assemblies) and 5 of them came
off
> the wave with these dime to quarter-sized delaminated blisters, maybe 3-4
of
> them on each board, and the other 4 boards looked fine! What would cause
> that? Entrapped moisture? The boards were supposedly baked before wave (At
> least the traveler said they were). Any ideas?
>
> -Steve Gregory-
>
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