Brazing with Nitrogen vs. Brazing without Nitrogen

This video was shot to show the effects of brazing copper pipe (15%) while flowing nitrogen and when not flowing nitrogen....this is NOT a "how to braze" video and it doesn't claim to be one. If you are a homeowner buying a central air conditioner and your installing contractor doesn't flow nitrogen while brazing.....throw them out of your home!

Category:

Education

Tags:

• Brazing
• Nitrogen
• Purge
• HVAC
• Air Conditioner
• AC
• Heat
• Heating and Cooling
• Technician
• Soldering
• Solder
• Oxidation
• Copper Brazing
• Copper Soldering
• Copper
• Copper Pipe
• Air Conditioner Install
• Soft Copper
• brazing with nitrogen

[TheSlim2none]

Really / Tthe music is a little over the top you are not saving starving children on your video.

[HVACwelder]

Nitrogen is required by ASME Section IX, American Welding Society B2.2 and NFPA 99. All professional contractors use nitrogen. I am a Dept. of Labor Sheet Metal/HVAC Apprenticeship Instructor, ASHRAE Member, AWS Member, RSES and ACCA Proctor and a certified welder and brazer. I appreciate the video makes a good point, but would suggest using some basic safety in your videos since other people might try and emmulate your video. Thanks and nicely done.

[orbtaybal]

I need more evidence of NOT present.

[redhot916spd]

I use this video for my customers when I am selling a new A/C unit or repair work of existing units. I was taught to use Nitrogen at the Business Technology Center in Kansas City Mo. My instructors were Mike Thorn and Dick Decker. I am grateful for the video, a picture is worth a thousand words.

[SPNFENDER]

Forgot to mention the importance of a filter drier on both lines as EVERY system will have some contaminents in it yes nitrogen does nearly eliminate them.

[archeryman5000]

@cdb1636 good move, I have been doing refrigeration for years, everything from small self contained refrigerators to super market rack systems. It is a good field with lots of work, you will have more call outs that are on overtime or after hours though as most people can wait till morning for a/c, if you walk-in freezers down and its 90 degrees out there is no waiting.

[cdb1636]

@archeryman5000 You make a good point. I have taken on a whole new job recently and moved from residential to refrigeration. As soon as I get myself settled in with things, I plan on making more videos about this type of thing. I have seen other videos of guys brazing 3/8" pipe with no nitrogen and very little (or no) oxidation....I want to do some research on larger pipe and see what happens when I simulate more of a true "system" scenario.....thanks for the view and the comment!

[archeryman5000]

@cdb1636 air is 79 percent nitrogen, so if you crimp or otherwise restrict the replenishing of the air in the line there is not enough oxygen to form the vast amount of oxides shown in the first braze, that is all I was saying.

22 cu feet of air contains enough oxygen to react with about 1/2 gram of copper the 1/2 pipe would be lucky to contain 2 cubic inches of air if the ends were restricted. I was not posting to not use nitrogen.

[cdb1636]

@archeryman5000 Yep, that's why its called a purge. The whole point is to remove the oxygen. If you cap the ends of the pipe it's no longer a purge....I run nitro in on the liquid side and back out on the suction side....I don't trap it in the system with oxygen......

[archeryman5000]

@lmeier1962 Nitrogen is very good, however try the braze with caps on the ends of the pipes so air will not flow through unlimited, you will find that the results will not be so dramatic.