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October 2010

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Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Thu, 14 Oct 2010 21:22:38 -0400
Content-Type:
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text/plain (87 lines)
If it is OSP board, after 2 SMT, you might have problem if use less active flux.  Wetting balance or normal spread test may not show any relevance.  My 2 cents (real 2 cents, not 1.99. :-)
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Chris Mahanna [mailto:[log in to unmask]]
Sent: Thursday, October 14, 2010 09:18 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Detecting Oxidation Levels of PTH

Leland,

The very quick answer: the latest general consensus is to not test the hole, but rather test the surface with a quantifiable performance based method -
wetting balance or spread test.  Both are available on the new 2221 W coupon.  Both are slated for pass fail criteria in next rev of 003.

Chris
Chris Mahanna
Robisan Lab

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Thursday, October 14, 2010 3:49 PM
To: [log in to unmask]
Subject: [TN] Detecting Oxidation Levels of PTH

Techies,

We have one assembly that sporadically experiences insufficient solder
fill of plated through holes at the wave soldering process.

If we cross section one of these, what testing equipment is best suited
to detect the presence of oxidation on the PTH walls?  What would be
considered an unacceptable level that would prevent 100% climb?

Thanks in advance for your responses!

Leland

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