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October 2010

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Mon, 18 Oct 2010 16:59:41 -0400
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TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
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Joyce Koo <[log in to unmask]>
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What is your OSP? What is vendor recommended reflow times? What temp and for how long?  (You do not have to spill the bean).  The answer is in the material and process selection. Someone did not do the homework and you pay for it. 
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Leland Woodall [mailto:[log in to unmask]]
Sent: Monday, October 18, 2010 04:41 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Detecting Oxidation Levels of PTH

Joyce and Richard,

Even though we have our upper thresholds set at 500 PPM, we consistently
run these specific lines between 35 and 70 PPM.  The most capable (and
newest) reflow ovens we have are producing the problem product.

Which only adds to the mystery...

Leland 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Monday, October 18, 2010 4:23 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. 
--------------------------
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----- 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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