Why Use Nitrogen to Weld Plastic?

You may be wondering, "Why use nitrogen to weld plastic? Why not just use hot air?" The reason is that welding with nitrogen makes a stronger weld.
Air is about 80% nitrogen and 20% oxygen. The oxygen in the air is what causes the problem. When you weld plastic with hot air, the melted plastic gets oxidized or burned in the process. When you weld with air, the plastic will literally burn. You can see smoke and sometimes even ash or sparks will form in the weld zone.
How do you make a fire? You need a source of fuel, you need head, and you need oxygen. If you snuff out the oxygen, the fire goes out. That’s the idea behind using nitrogen for welding. Welding with hot nitrogen gas flushes the air out of the weld zone. The plastic melts cleanly with no contamination, no smoke, no fire, no oxidation. The melted plastics can then fuse together with no contamination for maximum strength.
This video demonstrates the difference between hot air welding and nitrogen welding. You can see the plastic smoking and burning when it is welded with hot air, which doesn’t happen when using nitrogen.
Chapters:
Intro: 0:00
Why use nitrogen?: 0:10
Hot air welding: 0:29
How do you make fire?: 0:49
Nitrogen welding: 1:01
Smoking plastic vs nitrogen: 1:22
Other gasses: 1:39
View this video on our website: www.polyvance.com/video/plast...
⚠️ Important ⚠️
- Always wear proper safety gear while working!
- The length of this video is in no way representative of the actual time required to perform a complete repair and therefore should not be used for estimating purposes.
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[@Henry_Swanson]

These guys get professional results with nitrogen. I've done some home and driveway repairs with hot air and am left choosing between poor fusion from running too cold and burning the part running too hot. Burnt plastic has no ductility and will experience brittle failure quickly.

[@altamiradorable]

Can't believe people would be stupid enough to use hydrogen ! Bah !! You never know !

[@brucebennett7229]

Usually just once.

[@aries6776]

ha ha! Oxygen is even worse! You don't even need a spark with Oxygen and once it catches light it can burn anything.

[@marianmarian6760]

nitrogen - no hydrogen

[@aries6776]

@@marianmarian6760 No the video gave a warning not to use Hydrogen or Oxygen. That's clearly what he is referring to.

[@marianmarian6760]

plastic bumper cover is just a decoration - why does it need a strong weld? when will the gas pipeline be welded with nitrogen? there a strong weld has its meaning.....

[@fun_ghoul]

You've clearly never driven down Carling Avenue in the spring.

[@aries6776]

What if you just gently knock your bumper against something and it cracks on the repair spot? Do the job properly the first time. You don't need an expensive set up either. I can achieve the same with a soldering iron and a nitrogen feed.

[@marianmarian6760]

@@aries6776 my patch withstands shock-free nitrogen for the first time

[@marianmarian6760]

@@fun_ghoul there are too many people in the world - we can't all ride on carling avenue ..

[@aries6776]

@@marianmarian6760 but I bet it looks all shitty and burnt. I can get a cylinder of nitrogen for £30 and a regulator for the same price, plus some tubing for not much. And bumpers are designed to absorb energy not just for the vehicle and the occupants but for things they hit, like pedestrians. Your repair is more likely to give way and expose a pedestrian to bare metal. It's up to you but personally, I wouldn't like to know I was responsible for injuring someone more severely just because I was cheap.