When laser cutting machine cuts steel plate or stainless steel and other materials, it will use a cooperating gas. For example, when oxygen is used as a cooperating gas, it will produce an exothermic reaction, which is especially obvious when cutting carbon steel. This kind of solution is widely recognized.
In this process, oxygen is used at the projection point of the laser beam on the metal surface to heat the steel plate and bring about an exothermic reaction, so that the temperature of the area reaches the melting point. Cut surface with oxide layer.
But on the other hand, when cutting stainless steel, because stainless steel has a higher melting point, its characteristics are also different. When the cutting quality and smoothness are both included in the assessment, residual oxidation will be formed on the metal surface due to the use of oxidation as the auxiliary gas. Therefore, the cutting quality cannot achieve a good effect.
In order to solve this problem, after repeated research by laser experts, nitrogen is finally used as the auxiliary gas. Since nitrogen is an endothermic process, it is essentially a process of evaporation and ablation, and higher pressure means higher operating costs.
Nozzle diameter has a greater impact on gas consumption, so cutting thicker materials requires larger nozzles, so nitrogen is generally used as an auxiliary gas for cutting stainless steel.
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