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Nitrogen Assisted Gas Generator Reduces the Cost of Laser Cutting Stainless Stee

2019-05-05 15:50 admin
In the late 1980s, with the application of laser cutting sheet metal technology, the quality of cutting stainless steel and the formation of oxide have become significant problems. When oxygen is used as an auxiliary gas, exothermic reaction occurs, especially when cutting carbon steel. This phenomenon has been documented and widely recognized. In this process, oxygen obviously acts on the laser beam projection point on the metal surface, heating the steel, resulting in exothermic reaction, raising the temperature of the region to the melting point, and melting liquid metal flows down the cutting wall, separating from the beam action area. With the melting and peeling of metals, fresh metals are exposed to the surface, resulting in a fairly smooth cutting surface with oxide layer.

On the other hand, stainless steel has a higher melting point and different characteristics. Oxygen assistance is usually an unacceptable method when the quality and thickness of cutting become factors to be considered, because it generates residual oxides on the metal surface. In order to solve this problem, in the early 1990s, people usually used low-pressure nitrogen auxiliary gas. With the emergence of high-pressure optical elements in the later stage, higher gas transmission pressure is possible. This is an endothermic process, essentially evaporation/melting process, which does not produce any residual oxides on the cutting surface, thus improving the cutting quality. Because auxiliary gases play a role in removing molten metals from the cutting zone, gas pressure and purity become important factors. Higher pressure means greater gas consumption, which means higher operating costs. Nozzle diameter has a greater impact on gas consumption, because cutting thicker materials requires larger nozzles.

In the late 1980s, with the application of laser cutting sheet metal technology, the quality of cutting stainless steel and the formation of oxide have become significant problems. When oxygen is used as an auxiliary gas, exothermic reaction occurs, especially when cutting carbon steel. This phenomenon has been documented and widely recognized. In this process, oxygen obviously acts on the laser beam projection point on the metal surface, heating the steel, resulting in exothermic reaction, raising the temperature of the region to the melting point, and melting liquid metal flows down the cutting wall, separating from the beam action area. With the melting and peeling of metals, fresh metals are exposed to the surface, resulting in a fairly smooth cutting surface with oxide layer.

On the other hand, stainless steel has a higher melting point and different characteristics. Oxygen assistance is usually an unacceptable method when the quality and thickness of cutting become factors to be considered, because it generates residual oxides on the metal surface. In order to solve this problem, in the early 1990s, people usually used low-pressure nitrogen auxiliary gas. With the emergence of high-pressure optical elements in the later stage, higher gas transmission pressure is possible. This is an endothermic process, essentially evaporation/melting process, which does not produce any residual oxides on the cutting surface, thus improving the cutting quality. Because auxiliary gases play a role in removing molten metals from the cutting zone, gas pressure and purity become important factors. Higher pressure means greater gas consumption, which means higher operating costs. Nozzle diameter has a greater impact on gas consumption, because cutting thicker materials requires larger nozzles.