Fiber Laser Cutting Guide: How Thick Can Different Power Levels Cut?

Laser cutting machines have become indispensable in modern manufacturing due to their high precision, efficiency, and flexibility. The cutting thickness varies significantly depending on the laser power and material type. Below is a reference guide for common fiber laser cutting machine powers and their cutting capabilities for different metals (for reference only; actual performance depends on machine quality, cutting environment, auxiliary gas, cutting speed, and other factors).

I. Cutting Thickness Reference for 500W～3000W Fiber Laser Cutting Machines

Key Rule: The higher the power, the greater the cutting thickness. Carbon steel is the easiest to cut due to the oxygen combustion reaction, followed by stainless steel and aluminum. Copper and other highly reflective materials are the most difficult. Using auxiliary gas can enhance cutting capacity. For example, carbon steel cutting mainly relies on oxygen burning, while stainless steel cutting depends primarily on power.

II. High Power (4000W～10000W) Cutting Capability Details

Special Notes:

• A 4500W laser can cut stainless steel up to 20mm, but the cut surface quality is not guaranteed above 12mm; below 12mm, a bright surface can be achieved.

• 6000W offers better cutting capability but comes at a higher cost.

• For mass production, it is recommended to use a thickness one grade lower than the maximum limit to ensure edge quality and cutting speed.

III. Key Factors Affecting Cutting Capability

1. Auxiliary Gas Selection: Oxygen is suitable for carbon steel (exothermic reaction increases efficiency), nitrogen for stainless steel and aluminum (prevents oxidation), and compressed air for low-cost processing.

2. Trade-off Between Speed and Quality: Higher power allows faster speeds, but excessive power can increase the heat-affected zone and cause slag adhesion. For example, cutting 1mm carbon steel with 1000W can reach 500mm/s, while 3mm carbon steel requires reducing speed to 300mm/s.

3. Equipment Quality and Maintenance: Fiber lasers have an electro-optical conversion efficiency of up to 45% and beam quality M²<1.2, ensuring smooth, burr-free cutting edges. High-quality cutting heads and stable cooling systems are critical for long-term stable operation.

IV. Practical Application Recommendations

• Thin Plate Processing (≤6mm): 1000W～2000W is recommended for the best cost-performance ratio.

• Medium Plate Processing (6～20mm): 3000W～6000W is the mainstream choice.

• Thick Plate Processing (>20mm): Requires 6000W+ high-power equipment, but you must accept reduced edge quality or slower cutting speeds.

Final Conclusion: There is no absolute "maximum thickness"—only "economical batch cutting thickness" and "limit cutting thickness." It is recommended to find the balance among "thickness, speed, and quality" based on actual production volume, precision requirements, and budget.