Practical sheet | REF: FIC1278 V1

Discover hot gas (nitrogen) welding

Author: Delphine Mathilde COSME

Publication date: March 10, 2014 | Lire en français

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2. Why opt for inert gas protection when welding thermoplastics?

2.1 Separating nitrogen from air: a fairly simple operation

In principle, there are two ways of separating air to produce nitrogen and oxygen: cryogenic processes and non-cryogenic (membrane) processes such as PSA / VPSA (gas purification: Pressure Swing Adsorption).

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2.2 Air separation method for nitrogen extraction

Condensation: on condensation, molecular nitrogen becomes a colorless liquid. It is extremely unreactive, does not dissolve in water and is non-flammable.

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Why opt for inert gas protection when welding thermoplastics?