Yes.
For a diagnostic:
It would be useful/informative to know if the holes fill on an as-received
board and after one/two (simulated) reflows.
Regards
Mike
Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Monday, October 18, 2010 9:38 PM
To: [log in to unmask]
Subject: Re: [TN] Detecting Oxidation Levels of PTH
It has been my experience that wave solder fluxes penetrating the barrels of
T/H parts are more than active enough to clean atmospheric reflow induced
Cu-oxides out if the fluxes actually penetrate the hole...
If reflow induced Cu-oxides are sufficient to stop wave solder fluxes from
doing their job then I think it would be time to replace the flux...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Monday, October 18, 2010 1:23 PM
To: [log in to unmask]
Subject: Re: [TN] Detecting Oxidation Levels of PTH
However, he need to preserve what ever the OSP left in the hole and prevent
the oxidation prior to hit the wave. The 100ppm or less for the SMT 2x is
important if it is not criticle. What ever it is, the 500ppm is the down
fall for sure.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Monday, October 18, 2010 02:24 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Detecting Oxidation Levels of PTH
Agree. However Leland was talking about the reflow ovens, not the wave
solder, which led to my posting. I agree however that Nitrogen levels don't
do a lot for a turbulent wave.
From: Paul Edwards [mailto:[log in to unmask]]
Sent: Monday, October 18, 2010 11:46 AM
To: TechNet E-Mail Forum; Stadem, Richard D.
Subject: RE: [TN] Detecting Oxidation Levels of PTH
For SMT under around 100ppm gives sometimes gives great results, but haven't
seen the less than the 500 ppm grive radical improvement in wave solder
because of the turbulence of the wave and activity of the flux...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Saturday, October 16, 2010 6:02 AM
To: [log in to unmask]
Subject: Re: [TN] Detecting Oxidation Levels of PTH
Oxygen levels should be less than 75 ppm, else don't bother.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Friday, October 15, 2010 7:45 AM
To: [log in to unmask]
Subject: Re: [TN] Detecting Oxidation Levels of PTH
Joyce,
We have nitrogen in the reflow ovens with max O2 levels of 500 ppm. Our
facility humidity is controlled and within a range of 35 to 45%.
We also have nitrogen pumping at the wave bath.
Leland
-----Original Message-----
From: Joyce Koo [mailto:[log in to unmask]]
Sent: Friday, October 15, 2010 8:37 AM
To: [log in to unmask]; Leland Woodall
Subject: Re: [TN] Detecting Oxidation Levels of PTH
Not nitrogen reflow prior to wave? How many times SMT before wave? What
is the humidity contorl on the floor?
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Leland Woodall [mailto:[log in to unmask]]
Sent: Friday, October 15, 2010 08:32 AM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Detecting Oxidation Levels of PTH
OSP over copper, lead-free, SAC 305 process.
-----Original Message-----
From: Tan Geok Ang [mailto:[log in to unmask]]
Sent: Thursday, October 14, 2010 8:23 PM
To: TechNet E-Mail Forum; Leland Woodall
Subject: RE: [TN] Detecting Oxidation Levels of PTH
ImAg Boards?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Friday, 15 October 2010 3:49 AM
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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