Why Use Nitrogen to Weld Plastic?

Why Use Nitrogen to Weld Plastic?


You may be wondering why use nitrogen to well? Why not just use hot air? The reason is that nitrogen makes a stronger
weld. Air is about 80 percent nitrogen and 20 percent
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 heat,
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. Here you can see the effect of the nitrogen. You can see the plastic residue on the welder
tip smoking as the air oxidizes it. When you blow nitrogen on the tip, the smoke disappears. The nitrogen flushes the air out of the area
and keeps the tip from smoking. You can also use other inert gases for welding. You might find it more convenient to use argon/CO2
blend since you already use it for your MIG welder. That’s fine. Nitrogen is just usually a little cheaper. Do not use oxygen or hydrogen. The Hindenburg used hydrogen, and we all know
how that worked out.

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