Well, change OSP, change to Nitrogen reflow SMT, change flux to more active, etc. Do solderability test use your process simulation plus few hours sitting around in between SMT and wave.or do all of the above, send to Robinson for analysis at each stage, check oxide thickness (if you rich enough) using surface analysis or chemical analysis with a student project (not going to be shor time, at least a week). With 10 to 30K, you get what you asking for (provide you hire a smart kid).
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Leland Woodall [mailto:[log in to unmask]]
Sent: Friday, October 15, 2010 08:35 AM
To: TechNet E-Mail Forum <[log in to unmask]>; Joyce Koo
Subject: RE: [TN] Detecting Oxidation Levels of PTH
Joyce,
It does indeed see 2 SMT cycles, is OSP over copper, and a lead free SAC
305 process. Our flux is a no-clean with 10% solids in an ultrasonic
spray application at wave solder.
Leland
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Thursday, October 14, 2010 9:23 PM
To: [log in to unmask]
Subject: Re: [TN] Detecting Oxidation Levels of PTH
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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