Nitrogen is used during the production and welding of stainless steel pipes because stainless steel pipes will generate high temperatures during the production process and welding. At high temperatures, the metal elements in stainless steel can easily oxidize with oxygen in the air, so Weldings will crack and are prone to cracking and rusting later on. Therefore, adding nitrogen to cool the welds inside the stainless steel pipe without oxygen, ensures that the internal welds will not be oxidized by high temperatures and cause corrosion and cracking. Nitrogen protection is added. The weld bead is smooth and tidy, not easy to burst when bending, and the plasticity will be stronger.
