We also use nitrogen generation systems for 3 selective soldering machines.  
Relatively low flow rates required and since not "sealed", don't require high purity.  

Dick Krug, CSSBB, CSMTPE
Senior Process Engineer
Sparton Complex Systems
30167 Power Line Road
Brooksville, FL  34602-8299
p (352) 540-4012  (Internal Ext. 2012)
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Tuesday, February 25, 2014 8:36 AM
To: [log in to unmask]
Subject: Re: [TN] Nitrogen question

Hi Keith - two primary parameters when you are looking to use an inert soldering environment; what is your process volume demands and what purity to ya need. The use of nitrogen for the selective soldering process is typically to prevent the oxidation of the flow nozzles so you can maintain a very uniform and consistent solder flow. Most machines are "wide open" 
so you don't create a full blanket effect at the nozzle like you would with a wave solder or reflow oven. The lack of a smothering blanket means having super pure nitrogen isn't necessary. There have been some good details suggested TechNet already (i.e. dewars vs on site generation) so look at your process and make some calculations. We are running 5 selective solder machines  with a variety of nitrogen sources. A couple of systems use on site generation as there is no need for high purity, they have flow rates and limited low nitrogen supply access. A couple of systems are low volume so they just use dewars and a couple of systems are able to hook into the cryo line (we use LN2 for other processes so we have a couple locations with huge cryo tanks)  so they have the best of all worlds with high volume and high purity (note the high purity isn't necessary). Hope this helps and good luck.

Dave Hillman
Rockwell Collins
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From:   Keith Calhoun <[log in to unmask]>
To:     <[log in to unmask]>
Date:   02/25/2014 06:34 AM
Subject:        [TN] Nitrogen question
Sent by:        TechNet <[log in to unmask]>



We are looking into installing a selective soldering machine in our facility.  The machine we are looking into wants a nitrogen supply to inert the solder pot.
My question to the forum is what source are you using for their nitrogen requirements?  Also what purity level are you using?
 
 
Keith S. Calhoun
Manufacturing Engineering Manager
Sopark Corporation
3300 South Park Avenue
Lackawanna, New York 14218
716-822-0434 Ext. 237
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SoPark Corporation
Talent - Teamwork - Technology
Over 32 years as a Premier Electronics Manufacturing Service Provider ISO 9001:2008, ISO 13485:2003 & AS9100C Certified 
 

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