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Brief Analysis Mild Steel Bright Surface With Oxygen Laser Cutting

Time：2022-11-5

Three functions of laser

  • Preheating before cutting starts. Before cutting, heat the steel plate to a temperature above the ignition temperature (>1000℃) so that it can react with oxygen at high temperature;
  • The preheating effect in the cutting process. The steel plate in a certain area in front of the slit is heated to above the ignition temperature to ensure that the surface can quickly undergo oxidation reaction when the cutting airflow passes.
  • The function of heat compensation at the cutting seam. At the cutting seam, compensate the heat loss caused by heat conduction, radiation, slag removal, etc. to ensure the temperature of the cutting area;

The role of oxygen

When cutting, oxygen and high-temperature iron undergo a violent oxidative exothermic reaction, melting the metal and blowing away the slag.

Bright surface cutting conditions

  • Suitable for cutting with small nozzles, with small airflow diameter;
  • In order to ensure that the spot diameter on the surface of the plate is large enough, a large defocusing amount is required when cutting;
  • The thicker the plate, the larger the spot diameter and the larger the defocusing amount;
  • Ensure that the light spot irradiated on the surface of the plate can heat the temperature of the steel plate to above the ignition temperature (>1000℃) in a very short time. Excessive power will increase the heat input and cause the plate to overheat, which is detrimental to the cutting effect;

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