Eliminate bottom dross on 10mm–35mm carbon steel, boost linear throughput by 50% over pure N2, and cut assist gas consumption costs by up to 52% with precision closed-loop gas mixing.
What is MixGas Laser Cutting? Nitrogen-Oxygen (MixGas) laser cutting is an advanced thermal processing technique that blends 96.0%–99.0% high-purity Nitrogen ($N_2$) with 1.0%–4.0% micro-dosed Oxygen ($O_2$) at 14–22 bar pressure. The trace oxygen triggers a micro-exothermic reaction that dramatically reduces molten pool surface tension and viscosity, accelerating melt ejection from the kerf without forming a hard, brittle oxide layer. On 10mm–30mm carbon steel plates, MixGas delivers 45%–70% higher cutting feed rates than pure Nitrogen and produces dross-free, weld-ready, paint-receptive edges at half the total gas cost of conventional high-flow Nitrogen cutting.
When cutting carbon steel (such as Q235, S275, S355, A36, or 1045) with pure Nitrogen ($N_2$), the laser beam must supply 100% of the enthalpy required to melt the metal. Because pure molten iron has high kinematic viscosity and surface tension, high-speed cutting on thick plates frequently produces stubborn bottom burrs (dross) or requires extreme gas pressure (22+ bar) through large 3.5mm+ nozzles, driving gas costs to unsustainable levels.
By introducing a controlled 1.5% to 3.0% $O_2$ concentration:
Calculate your estimated cutting feed rate, gas consumption, and monthly operational savings when switching from Pure $N_2$ or Compressed Air to ACTCNC Intelligent MixGas System.
The following empirical cutting parameter matrix is benchmarked on ACTCNC heavy-duty gantry laser cutting machines equipped with dynamic proportional gas mixing valves and supersonic Laval nozzles.
| Laser Power | Plate Thickness (CS) | MixGas Ratio (N2 / O2) | Assist Gas Pressure | Nozzle Spec | Cutting Speed | Edge Quality & Finish |
|---|---|---|---|---|---|---|
| 12 kW | 12 mm Carbon Steel | 98.0% N2 + 2.0% O2 | 16.0 bar | 2.0 mm Double | 4.2 – 4.8 m/min | Mirror-smooth, 0% bottom dross |
| 12 kW | 20 mm Carbon Steel | 97.5% N2 + 2.5% O2 | 18.5 bar | 2.5 mm Highspeed | 1.8 – 2.2 m/min | Clean edge, weldable directly |
| 20 kW | 16 mm Carbon Steel | 98.0% N2 + 2.0% O2 | 16.5 bar | 2.5 mm Laval | 5.6 – 6.4 m/min | Zero burr, perpendicular cut |
| 20 kW | 25 mm Carbon Steel | 97.0% N2 + 3.0% O2 | 19.0 bar | 3.0 mm Laval | 2.8 – 3.4 m/min | Sharp bottom corner, Ra < 6.3 µm |
| 30 kW | 20 mm Carbon Steel | 98.0% N2 + 2.0% O2 | 16.0 bar | 2.5 mm Double | 8.5 – 9.6 m/min | Ultra-fast, paint-ready surface |
| 30 kW | 30 mm Carbon Steel | 97.0% N2 + 3.0% O2 | 18.0 bar | 3.5 mm Laval | 4.2 – 4.8 m/min | Dross-free, slag drops off cleanly |
| 60 kW | 40 mm Carbon Steel | 96.5% N2 + 3.5% O2 | 18.0 bar | 4.0 mm Supersonic | 5.5 – 6.2 m/min | Extreme throughput, parallel kerf |
| 60 kW | 50 mm Heavy Plate | 96.0% N2 + 4.0% O2 | 19.5 bar | 4.5 mm Supersonic | 3.2 – 3.8 m/min | Continuous flash pierce + smooth cut |
| Evaluation Dimension | Pure Oxygen (O2) | Pure Nitrogen (N2) | Compressed Air (16 bar) | ACTCNC Intelligent MixGas |
|---|---|---|---|---|
| Cutting Speed (16mm CS) | 1.4 m/min (Slow) | 3.6 m/min | 3.2 m/min | 5.8 m/min (+61% Boost) |
| Kerf Edge Finish | Heavy black oxide scale | Bright, silver-metallic | Yellow-brown oxidation | Silvery / Ultra-thin micro-oxide |
| Bottom Dross / Burr | Zero dross, clean drop | Prone to micro-dross on >16mm | Moderate sticky dross | 100% Dross-free, smooth bottom |
| Post-Process Grinding Cost | High ($0.45/m) | Low ($0.05/m) | Medium ($0.22/m) | Zero ($0.00/m - Direct Weld) |
| Gas Sourcing Cost | Low ($0.08/m) | High ($0.38/m) | Very Low ($0.04/m) | Medium-Low ($0.18/m) |
| Part Deformation (Heat Affected Zone) | High (Severe thermal input) | Ultra-Low (Cold cut) | Low | Ultra-Low (High-speed cold exit) |
Contact ACTCNC senior application engineers for custom gas mixer integration, on-site parameter tuning, or machine retrofits.
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