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January 2018

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From:
"Stadem, Richard D" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D
Date:
Thu, 11 Jan 2018 15:55:31 +0000
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I completely and totally agree with you and your approach!
99.9999999999% purity is absolutely not required for good soldering results. I have qualified the nitrogen supply (different suppliers) back when we used to buy our nitrogen in the 100 lb. tanks, and even at 99.5% the soldering results were indiscernible versus 99.9% or better nitrogen purity levels. Even with an oxygen level of 15% we saw no difference. We evaluated this with parts that had oxidized as well as wetting with brushed copper PWB samples. With no nitrogen, just air, only then did we see a significant impact on the DPMO or wetting spread for these parts. As far as I am concerned, any nitrogen purity level above 98% works just fine for "normal" electronic soldering processes, wave, selective, or otherwise.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Mack
Sent: Wednesday, January 10, 2018 4:45 PM
To: [log in to unmask]
Subject: Re: [TN] Nitrogen generators

We run a couple of OnSite Gas Nitrogen generators to supply 4 select solder machines, so not huge volume required like wave or an oven, Hooked them up to a big reservoir tank ( I think 600 gal) to maintain consistency. 
You need to know the flow rate you require before picking a model. With ours at a steady 2.9 m³/hr we get 99.995%  (if you want higher flow, less
purity)
It is less purity than we get when we used bottles, but barely noticed and the difference does not affect soldering.

For our location trucking in tanks or liquid was really expensive. The generators paid for themselves almost instantly and are very low maintenance.


Roger Mack  P.Eng. 
Manufacturing Specialist
Parker Hannifin Canada
Electronic Controls Division
1305 Clarence Avenue
Winnipeg, MB  R3T 1T4 Canada
direct 204 453 3339 x7373
[log in to unmask]
www.parker.com/ecd







From:   "Stadem, Richard D" <[log in to unmask]>
To:     <[log in to unmask]>
Date:   2018-01-10 04:28 PM
Subject:        Re: [TN] Nitrogen generators
Sent by:        TechNet <[log in to unmask]>



We have nitrogen generators on four selective solder machines at one of 
the companies I work for. During the off-shift hours, the SS machine 
nitrogen generator is switched with a simple valve to refill empty 
nitrogen tanks. We then use the refilled tanks elsewhere in the building 
for other applications. We can measure the quality of the surplus nitrogen 
using the built in monitors. 
Thinking about getting rid of the liquid tank outside.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Wednesday, January 10, 2018 3:44 PM
To: [log in to unmask]
Subject: Re: [TN] Nitrogen generators

Hi Blair
What soldering processes?  We run two selective solder machines using a 
nitrogen generator, it is reasonably economical.  And pretty low 
maintenance.  At a previous job I looked at replacing the liquid nitrogen 
tank with a generator, big bucks but so is tank nitrogen.

cheers,
 Graham Collins
________________________________________
From: TechNet [[log in to unmask]] on behalf of Blair Hogg 
[[log in to unmask]]
Sent: Wednesday, January 10, 2018 12:56 PM
To: [log in to unmask]
Subject: [TN] Nitrogen generators

Hi Technetters,

We are thinking of switching from using bottled / tanked nitrogen for our 
soldering processes to getting a nitrogen generator. Looking for advice on 
what systems others are using and what they like / dislike about them. You 
can reply directly if you don't want to share with the list.

Thanks,
Blair

Anyone tried using the search tools from the web interface lately? I can't 
seem to get it to work.



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