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Why Can High Power Enclosed Fiber Laser Cutter Cut Thick Plates

With the rapid development of laser technology, the power of lasers and laser cutting equipment is getting higher and higher. The 12kw-60kw high power fiber laser cutter comes out. For users, based on the increase in power, they are not only concerned about the increase in sheet metal cutting thickness, but also the quality of sheet metal cutting. So the power is getting higher and higher, what are the advantages?

This article comprehensively analyzes how to cut high-quality stainless steel thick plates from gas, process, and debugging.

high power laser cutting machine
China high power metal laser cutter laser

High power enclosed fiber laser cutter Advantages

The limit cutting thickness of the plate is increased

At present, high power fiber laser cutter can cut carbon steel plates up to 80mm thick and stainless steel plates up to 100mm thick. With the continuous upgrading of laser cutting technology, the cutting thickness of plates will continue to increase.

Improved cutting efficiency

The cutting efficiency of 20000W is significantly better than that of 12000W, and the cutting efficiency increases by 50-320%. The smaller the thickness of the material, the advantage is not obvious due to excess power; the larger the thickness, the more obvious the advantage.

Increase in income

For production and processing customers, processing efficiency determines the amount of income. The greater the power, the higher the efficiency, thus doubling the benefits. The processing income that can be obtained with 20000W is 2.4 times and 3.2 times that of 12000W.

Similarly, when cutting stainless steel materials, the advantage of 20000W is significantly higher than that of 12000W. When cutting 10mm and 20mm thick stainless steel, the processing income of 20000W is about 1.5 million and 1.1 million, which is 2 times and 2.3 times that of 12000W. 30mm and 40mm thicknesses also have obvious efficiency gains.

Cost reduction

20000W is 3 times more efficient than 12000W, saving you more time and cost. At the same time, it also greatly reduces the processing cost per meter. More importantly, the higher-quality cross-section effect after cutting brings you higher product added value. It truly achieves “better, faster and more economical”!

The increase in power not only improves cutting efficiency, but also brings you a significant increase in processing income and saves more costs.

what is a cnc laser cutter

Effects of different auxiliary gases on stainless steel cutting

ParameterNitrogen GasOxygen Gas
SourceNitrogen gas cylinderOxygen gas cylinder
Cutting EffectSilver-colored cutting surfaceWhite-colored cutting surface
Supply MethodStored in tanksSupplied by air compressor
Pressure> 3 Pa> 3 Pa
Purity99.999999%Standard purity (requires air purification)
Handling EquipmentGas cylinderAir compressor
Backend TreatmentN/AWater and oil removal, filter replacement
AdvantagesLow cost, long usage time, stable pressureLow cost
Maintenance RequirementsN/ARegular filter replacement, water/oil removal
Special ConsiderationsN/AMust ensure purity to avoid contamination

Analysis of high power enclosed fiber laser cutter stainless steel thick plate cutting process

The 10,000-watt laser cuts stainless steel of different thicknesses to ensure that the cutting section is fine and without delamination. Different cutting methods should be used:

ParameterStainless Steel Thickness <= 25mmStainless Steel Thickness > 30mm
Cutting MethodFull Power Continuous Laser CuttingFull Peak Power Pulse Cutting
FocusNegative FocusPositive Focus
Focus AdjustmentThe thicker the material, the greater the negative focusThe thicker the material, the smaller the positive focus
Special ConsiderationsN/APulse cutting for thicker materials

Frequency changes

Frequency500Hz400Hz300Hz200Hz
Duty Cycle55%55%55%55%
PowerFrequency (Hz)Duty Cycle (%)Single Pulse Energy (J)Pulse Duration (ms)Pulse Off Time (ms)
12kW5005513.21.10.9
12kW4005516.51.3751.125
12kW30055221.8331.5
12kW20055332.752.25

Effect of frequency change: The frequency decreases from 500-200Hz, the cutting section effect becomes finer, and the layering gradually improves. When the frequency is set to 100Hz, it cannot be cut and blue light is reflected. Find the optimal frequency range by changing the frequency. To ensure the best cutting section, the number of pulses must perfectly match the energy of the single pulse.

Focus change

FocusFrequency (Hz)Duty Cycle (%)
+7mm20055
+8mm20055
+9mm20055

Effect of focus change: delamination of the lower section appears at focus +7mm, and the cutting surface turns yellow. As the focus rises, uncut traces of the lower surface become less delaminated. The focal width is about 2mm. When the focus rises to +10mm, cutting cannot be performed. Anti-blue light. Find the best surface focus position through the offset of the focus.

Duty cycle changes

Frequency200Hz200Hz200Hz
Duty Cycle52%53%60%

Influence of changes in duty cycle: 53% duty cycle is the critical value. If the duty cycle continues to be reduced, uncut traces will appear on the lower surface. When the duty cycle increases to 60%, the cross section becomes rough, the layering is obvious, and the cutting surface Yellowing.

Nozzle airflow changes (air pressure setting 21bar)

nozzle airflow changes
nozzle airflow changes

Influence of changes in nozzle airflow: Except for the diameter 2.0 nozzle, there is no significant difference in the effects of the other nozzles. A nozzle with a diameter of 8.0, set to 21bar, and the actual air pressure is 10bar, cannot cut normally. The thicker the stainless steel, the larger the nozzle should be used, the higher the air pressure setting, and the pressure and flow rate should be met at the same time to achieve normal cutting effects.

Stainless steel thick plate cutting and debugging method

  1. Nozzle Selection:
    • Choose a nozzle based on the one provided by the customer.
    • Confirm the actual air pressure required for the selected nozzle at the customer’s site.
  2. Frequency Control:
    • Input the basic parameters for the system.
    • Evaluate the cross-sectional effect and adjust the frequency accordingly, increasing or decreasing as needed.
  3. Duty Cycle Adjustment:
    • Input the basic parameters for the system.
    • Assess the cross-sectional effect and make adjustments to the duty cycle, increasing or decreasing as necessary.
  4. Focus Speed Adjustment:
    • Achieve the desired cross-sectional effect.
    • Increase the focus speed incrementally, fine-tuning until the optimum value for the fastest result is reached.
  5. Parameter Confirmation for Production:
    • Finalize the operational parameters based on the adjustments made.
    • Ensure that the duty cycle is above the critical threshold for effective production.
    • Set the speed limit to 0.9, optimizing for the highest achievable speed.

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