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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:
Sat, 16 Oct 2010 12:40:02 -0400
Content-Type:
text/plain
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text/plain (180 lines)
Agree.  Less than 100 for prevent oxidation.  Others just improve the cosmetic look of the solder surface.  
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Saturday, October 16, 2010 09:01 AM
To: [log in to unmask] <[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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