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: https://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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