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Nozzle design and airflow control technology: laser cut steel, oxygen and focusing of laser beam through the nozzle down onto the material to be cut, thus forming an airflow beam. The airflow to the air flow into the incision is the basic requirement to be big, high speed, so that enough oxidation to keep cut material to exothermic reaction full also has enough momentum to molten material Jet blowing out. Therefore, except for beam outside quality control directly affects the quality of cutting, nozzle design and flow control (such as nozzle pressure, workpiece position in the air, and so on) are also very important factors.

Laser cutting nozzle using a simple structure, consisting of a conical hole end of the small round holes (Figure 4). Often experimental and design errors. As nozzles made of copper in general manufacturing, small is vulnerable parts, need to change often, so there is no fluid dynamics calculations and analysis. Side access, in use from the nozzle pressure Pn (gauge Pg) gas nozzle pressures from the nozzle opening, by a certain distance to the surface, its pressure cutting pressure Pc, and gas expansion to atmospheric pressure Pa. Research shows that with the increase of Pn and flow velocity increases, Pc is increasing.