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Let’s examine these three factors in some detail: (2) Secondary operations, including edge quality required In order to make a proper decision between oxygen and nitrogen, the following criteria must be considered: This development has given the laser user a justifiable choice for his processing needs as he can now consider nitrogen assist gas as a valid method to process steel. Laser powers have been steadily increasing in various applications.
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This means that power is the determining factor in cutting speed more power equals more speed. Unlike oxygen, nitrogen serves as a shielding gas in light gauge material to stop the burning process and allow the laser to vaporize the material. Nitrogen is generally used when cutting stainless or aluminum in order to achieve excellent quality. This means that the cut speed, using oxygen as an assist gas in thin steel, would be the same for a 1500 watt to a 6000 watt laser. Only so much power can be applied to the material before too much burning occurs, resulting in a poor cut. This, in turn, is the limiting factor to cutting speed. The oxygen will do approximately 60 percent of the work. Thin steel does not require a significant amount of power due to the burning process, which involves an exothermic reaction – a chemical reaction of oxygen-burning iron which releases excess energy through heat and light. Traditionally, oxygen is most commonly used when cutting steels. They are selected based on the type of material being cut, its thickness and the edge quality required. The most common assist gases used are oxygen and nitrogen. Specific parameters used in this process, such as laser power and assist gas type, will significantly impact the overall quality and processing time during operation. Laser cutting is a thermal machining process where the laser beam serves as a tool. Lubricants, Coolants, Metalworking Fluids.Computerized Maintenance Management Systems.Abrasives, Belts, Brushes, Grinding Wheels.