Nitrogen Purge While Brazing
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- Опубликовано: 12 апр 2016
- Welcome to Enertech University, online training by Enertech. One of the most overlooked steps is the use of a nitrogen purge while brazing. Without the use of nitrogen (or helium), black oxide forms (cupric oxide). After cooling the oxide forms scale and flakes off over time. We see this on copper tubing as a light to dark brown discoloration. As refrigerant (especially R-410) flows through the tubing, it scrubs the tubing and flakes break loose.
In time, metering devices, reversing valves, compressors and other devices will clog and fail. Thanks for watching! 
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I’ve never used a nitrogen purge in my life. They didn’t even teach us this in school…I’ll have to start tomorrow! This is good to know
Same. This is just propaganda from “Big Nitrogen”
JK I’ll probably give it a try
@@tonyortega8660 It’s not propaganda. Most techs know it is best practice, but are too lazy to do it. I don’t agree that it causes a problem with every system. That is just not true.
hey thanks for this! somehow they forgot to teach me this during my two year HVAC degree
This is a very important concept. I can’t imagine a competent instructor leaving nitrogen purging out of the curriculum.
Good video, to the point, gives needed info quickly.
Awesome video as always!! Thanks
Thankyou very much for this training video
good tutorial thanks to you and GEOTHERMAL UNIVERSITY
excellent video and explanation
great video!!!
yes awesome video!!! Thank you for this!!!
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A good way is to hold a lit match at the exit point. Nitrogen will snuff out the flame if there is no oxygen present. A flow meter that is very sensitive, should be used instead of a regulator. It’s flow that is important, not pressure.
Thank you for a very informative video!
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You need the uniweld accu view,than ks
This is amazing ❤❤
Thank you nice video.
i love this video
Thanks 👌
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Aslamu aleykum jamal Bhai
Did yoy give online course in brazing or you can call it wellding
For refrigerator brazing time also need this same.
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Thank you!
I like your shirt!😁😂
Thank you so much......
Awesome sir
❤❤❤❤
Nitrogen and torch free tube joining?! It's not a dream, it's Tufflok.
Bravo!
I just had TWO expensive Carrier Inverter systems installed and the contractor did NOT use nitrogen as he said he would. He will not replace the two air handlers and outside condensers and I contacted my attorney. I have way too much $$$$ in this investment for it to have a very short life.
Sixteen years in the trade and I’ve never once seen this done. If he pulled a triple vacuum using nitrogen in between then there’s no difference. That stuff comes out that’s the whole purpose of pulling a triple vacuum (another thing no one does) regardless I’ve pretty much never seen and line blockage unless the installer accidentally put the end of the pipe in the dirt and didn’t have it capped then didn’t realize there was a little piece of sand dirt or stone in there. I’ve only seen that once but yeah I went to school and they never taught us this.
Or after years the filter drier eventually breaks down….
@@Alienspecies635 At 1:40 he explains that this is a larger issue with R410A, so it makes sense that this is more of a new practice and was not taught in school back in the day. Tech schools now are teaching this procedure though.
@@alecbrendon6662 true but still no no one does it. And 410a isn’t new it’s been around for a good 15-20 years now
@@Alienspecies635 Absolutely. I'm not saying R410A is new, but R22 has only just gone out of production last year. New practices take years to incorporate into the norm, especially when all the older experienced techs tell the newer techs that it doesn't matter. So it's no surprise to me that it's taking years to become a regular practice.
I'm currently a new student myself so believe me I'm only trying to learn, not trying to grind your gears.
For refrigerator pipe brazing also same methode we can use or in Ac system only. Pls reply sir.
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good information , use proper nozzle size when brazing larger pipe thanks
Hi, Im only wants to know more about using nitrogen during soldering / brazing during replacement of compressor? because there is no outlet, or exhaust. Thanks and regards.
You would need to run nitrogen through the your suction gauge line, then into the suction on the refrigerant system. Hook up your high side hose from gauges to the liquid line at the unit, then disconnect the high side hose from your gauges and let nitrogen bleed out of it
a it means from the service valve of suction line I will inject nitrogen and to purge in high side service valve when I soldering the line to compressor (vice versa). I've been checking in some shared knowledge in youtube replacing compressor and soldering applying nitrogen. that is my doubt since the compressor side nitrogen cant flow through it during repair and off condition. Thank you for your kind information...
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@@EnertechUniversity how much pressure do I need to apply? Thanks in advance.
Use a flow meter
Just order a regular bottle of nitrogen or do you have to request "dry" nitrogen?
Dry nitrogen is what you want.
No sound ?
How do you braze a pressurized system? Wouldnt the nitro blow out the seal every time? Or i guess your talking about using as a pass through internal shielding gas.. and thatd work fine up until your final connection unless you are able to work it in a way so the last point is next to a service port you can open up..
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That’s the reason you are supposed to us a flow meter, instead of a regulator. You can get proper flow, by just barely letting it in. You purge the line well before you start brazing, to remove all the oxygen from the pipe. After that you reduce the flow to almost nothing. If it will extinguish a match held at the outlet, that is enough. A flow meter has a valve, and the flow is indicated by a ball that floats vertically in a sealed tube. I always used the minimum setting, and that was enough
you need a flow regulator!
Yes for a "professional" educational video I'm shocked at the lack of flow regulator.!
A biggest problem with nitro is the bottle running out too soon, accidentally due to excess flow
불이 너무 적다 토치자체가 대구경 동관용으로는 부족함
We are into manufacturing of SS utensils. We use TIG with argon gas for welding. Sheet thickness is 0.4 mm. Sometimes we get holes, while welding. One of my friend told about nitrogen purge. Can you provide solution for my problem. If required, I can share photos. Please provide your feedback..
I'm not the video uploader but just wanted to throw this out there for anyone else reading.
Argon is an inert gas. you should be fine using that. If you're getting burn through, you're either keeping the electrode there too long or you're using too high of a current. if you're welding really thin metals, you'll need to set the set the tig welder for very short duration welding.
If it's not programmable, you'll need a pedal that can be used with an ardiuno board to program for short bursts.
If you're already welding in short bursts and are still experiencing burn through, you may need to add a filler metal. I especially recommend filler rod if it's two parts side by side since it's taking from the base metal every time you put the electrode to it, the parts are too thin to do that.
If you're welding one piece on top of another instead of side by side, you'll be far better off using a spot welder.
Does this process specifically require nitrogen, or can another inert gas be used, such as carbon dioxide?
Only Nitrogen is approved!
john pendleton,
Approved by who?
My local nitrogen supplier?
"Let me tell ya something!"
(reference to Fire Marshal Bill, from Saturday Night Live)
I conducted an experiment. I flowed 25% Argon / 75% Carbon Dioxide through a copper pipe swaged connection, and brazed that joint.
Then ... I cut the joint apart and carefully inspected it.
Betcha' can't guess what I found.
YOU CAN USE OTHER INERT GASSES.
Why did I choose the Argon/CO2 mix???
Mmmm ... cuz I already had a tank, regulator, flow meter set-up for my MIG welder.
So, if the Nitrogen Police raid your jobsite, and shoot up your brazing crew, use your last dying breath to mention that Marshall approves any inert gas for residue-free brazing.
I mean, if you're going to bleed out soon anyway ... stand up for yourself.
@@marshalllhiepler nitrogen is a lot cheaper and more readily available.
@@TheNYgolfer it used to be cheap. The last time I had my cylinder filled the price had gone way up. This was at a welding store. They said it had gone up due to the fewer places that refine it.
How about filters. They are supposed to catch this junk.
Hi Jeswen, We appreciate your comment. We believe an ounce of prevention is worth a pound of cure. The filters will catch most junk but it may get stuck in the TXV first or stay in the compressor oil until the filter catches it. Purging with Nitrogen is always better.
Geothermal University
I appreciate the video as well. But you braze 50 cm pipe and in reality we are talking about 100 meters of pipe from the opening where you can put nitrogen to the branch where you braze. It's not really practical to waste so much nitrogen for each and every single braze.
I have been installing for 20 years. I personally believe thats horseshit. I haven’t seen those results from a non nitro purge. I do use a drier every time I replace a compressor. Been working the same area for 20 years. It sounds like your saving the life of a unit but I find most Heat Pump Coils usually leak within 10 years and it’s time for a repair and that usually after the Compressor has been running hot for days with half a charge. That compressor is 50% likely to die the the same year as the coil is replaced.
If you need nitrogen flowmeters or nitrogen purge alarms, please visit or website. Www.themedicalgas.com
FOAML8X Sorry if my verbage is a little rough. I could have said crap, but I never said Heat Pumps only last 10 years. We don’t even talk replacement until 15 years old. I have doing it to long the right way and I would hate to change now. 30 years ago techs hardly used vacuums. My first job as a tech we changed compressors with no drier or flush. Guy has a huge business. You do you👍