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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