What are the benefits of adding nitrogen to welding stainless steel pipes?

Welding is an important and essential link in the production process of stainless steel pipes. Generally, two welding methods, argon arc welding and high-frequency welding, are used as the welding processes for stainless steel pipes. When producing stainless steel pipes, liquid nitrogen is usually used as an auxiliary gas for welding pipes. So, why should we use liquid nitrogen instead of other auxiliary welding? Let’s give you some popular science:
The characteristic of stainless steel pipes is that they are not easy to rust. Liquid nitrogen plays a role in increasing the corrosion resistance of stainless steel during the welding process. Nitrogen can promote the formation of stable austenite and reduce the iron content in stainless steel. And during the production process of stainless steel pipes, nitrogen can also improve the strength, fatigue resistance and wear resistance of stainless steel pipes. Therefore, as an essential gas in the welding process, nitrogen plays an important role. This is why professional stainless steel pipe manufacturers use nitrogen as the gas during welding. In comparison, pipes produced by manufacturers that do not use nitrogen as protective welding will be prone to cracking and rusting at the welds.
In fact, nitrogen is not only used to protect the surface of the pipe during the production of stainless steel pipes. Nitrogen can also be used as a protective gas during the production process of other pipes, which can play an effective role during welding. The obvious difference in the finished product can be seen from the welding seam. Pipes using nitrogen as a protective gas will form an obvious white line at the welding seam; while pipes produced without nitrogen as a protective gas will have a welding seam. Yellow lines will appear, which can easily increase corrosion and rust of the pipe.