As we all know, when stainless steel pipes are welded, a protective gas is used to reduce the probability of rusting of stainless steel pipes. Is it better to use argon or nitrogen when welding stainless steel pipes? How much do you know about it?
1. The rusting of stainless steel is mainly caused by oxidation or corrosion. All stainless steel is not necessarily rust-free, even 304 stainless steel pipe, so the high temperature during welding will also cause the stainless steel weld to be oxidized and easy to rust later.
2. Argon is one of the six inert gases. It is difficult to react with substances in the air at high temperatures. Chemical reactions only occur under certain conditions, so argon can be used for protection during welding, and it is mainly It is an inert gas, even if it is inhaled by the human body, it is not harmful, and it is discharged with the body.
3. Nitrogen is also often used for protection during welding, but compared with argon, nitrogen is still not so good. The content of nitrogen in the air is 70%, which is convenient for collection, but in general, if liquid nitrogen is stored in the mainland, the storage process may not be as good as that of liquid argon, mainly because of their pressure treatment in liquid state.
In short, no matter which of the two gases is nitrogen or argon, oxygen-free welding can be achieved and the probability of rusting can be reduced.
