Key Technical Considerations For Cutting Thick Metal Plates With Fiber Laser Cutting Machines
Fiber laser cutting machines are widely used for processing metal plates, but the cutting methods vary depending on the material thickness. When operating a fiber laser cutter, it's crucial to apply flexible techniques based on actual conditions and proper operating procedures. Many users struggle with cutting thick metal plates, often encountering unexpected issues when using the same approach for different thicknesses.
Fiber laser cutters can perform both flat and bevel cutting with neat, smooth edges, making them ideal for high-precision metal cutting. Additionally, when integrated with robotic arms, they can achieve 3D cutting, replacing traditional imported five-axis laser systems. Compared to conventional CO₂ laser cutters, fiber lasers save space, reduce gas consumption, and offer higher photoelectric conversion efficiency, making them energy-efficient, eco-friendly, and among the world's leading laser technologies.
So, what should you pay attention to when cutting thick metal plates with a fiber laser cutter? Below are the key technical points you must know-analyzed by Lixing Laser's technical engineers.
Materials Suitable for Fiber Laser Cutting
Stainless steel, carbon steel, alloy steel, silicon steel, spring steel, aluminum, aluminum alloy, galvanized steel, aluminized zinc steel, pickled plate, copper, silver, gold, titanium, and other metal sheets and pipes.
Advantages of Fiber Laser Cutting
High precision, fast speed, narrow kerf, minimal heat-affected zone (HAZ), and smooth, burr-free cuts.
The laser cutting head does not contact the material surface, preventing scratches.
Minimal workpiece deformation due to the narrowest kerf and smallest HAZ.
Excellent flexibility-capable of cutting any shape, including pipes and profiles.
Can cut materials of any hardness, such as steel plates, stainless steel, aluminum alloy, and carbide, without deformation.
However, fiber laser cutting machines have thickness limitations when processing metal plates.
Why Cutting Thick Metal Plates is Challenging?
1. Temperature Instability at the Cutting Front
The cutting process relies on the iron combustion reaction, which becomes highly unstable when cutting thick plates. For stable cutting, continuous combustion must be maintained, and the temperature at the top of the kerf must reach the ignition point. However, in thick-plate cutting, combustion often cannot sustain itself because the reaction depends solely on iron-oxygen combustion energy release.
The primary reason thick-plate cutting is difficult is the low temperature at the cutting front. This occurs because the oxygen jet from the nozzle cools the kerf, reducing the temperature needed for continuous combustion.
2. Oxygen Diffusion Barrier
During cutting, an iron oxide (FeO) layer forms on the workpiece surface, blocking oxygen diffusion. When oxygen concentration drops below a critical level, the combustion reaction suddenly extinguishes, making thick-plate cutting impossible.
However, using a focused laser beam helps overcome this issue. The high power density of the concentrated laser beam rapidly heats a small area, easily reaching the ignition temperature and enabling efficient cutting.
Industrial Applications of Fiber Laser Cutting Machines
Widely used in:
Sheet metal fabrication, aerospace, electronics, appliances, subway components
Automotive, grain machinery, textile machinery, construction machinery
Precision parts, shipbuilding, metallurgical equipment, elevators
Home appliances, crafts, tool processing, decoration, advertising
Metal processing, kitchenware manufacturing, and other industrial sectors
Conclusion
The above points are critical considerations when cutting thick metal plates with a fiber laser cutter. By following these guidelines, operators can minimize unexpected issues and ensure high-quality cuts.