O₂/N₂ Laser Cutting: Quick Troubleshooting

O₂/N₂ Laser Cutting: Quick Troubleshooting

    In laser cutting, carbon steel is prone to edge ablation and slagging, while stainless steel is often oxidized, which affects quality and efficiency. Furthermore, oxygen and nitrogen cutting solutions cannot be used interchangeably. This article, combining real-world case studies, simplifies redundant theory to help engineers quickly pinpoint and efficiently resolve faults.

    I. Core Logic for Troubleshooting

Classify problems by their appearance to avoid blind parameter adjustments:

Shape deformation, incomplete outline, unilateral defects → Prioritize checking system alignment and nozzle status

Edge burns, roughness, excessively wide kerf → Excessive heat input or aggressive parameters

Incomplete cut, thick burrs at the bottom → Insufficient cutting energy or poor gas slag removal

Nitrogen cutting oxidation, discoloration → Insufficient protection, energy imbalance, or substandard gas purity

    II. Common Problems and Solutions for Oxygen Laser Cutting (Carbon Steel Dedicated)

1. Abnormal System Alignment and Stability

Fault: Cutting shape deformation, incomplete outline (program unchanged, prominent issues with circular shapes, etc.)

Causes: Focusing lens misalignment, nozzle blockage/non-circularity, optical path misalignment

Solution: Realign the lens; clean/replace the nozzle; calibrate the optical path.

2. Excessive Heat Input/Aggressive Parameter Settings

Fault 1: Severe Edge Burn + Excessively Wide Knife

Causes: Excessively High Gas Pressure, Excessively High Focal Length, Excessively High Power, Poor Raw Material Quality

Solutions: Reduce gas pressure by 0.1 bar each time; reduce focal length by 0.2 mm each time; reduce power; check lens accuracy.

Fault 2: Pitting and Uneven Edges

Causes: Heat Accumulation, High Gas Pressure, Slow Speed, High Focal Length, Impurities in Raw Material/Overheated Sheet

Solutions: Reduce gas pressure, increase speed, reduce focal length, replace with high-quality raw material, cool the sheet.

Fault 3: Extremely Rough Edges

Causes: Disruption of Thermal Balance, High Focal Length, High Gas Pressure, Low Speed, Continuous Overheating of Sheet

Solutions: Reduce focal length, reduce gas pressure, increase speed, cool the sheet.

3. Insufficient Cutting Energy/Poor Gas Slag Removal Capacity

Fault 1: Incomplete Cutting, Uncut Sections (Accompanied by Blue-Purple Plasma)

Causes: Low Power, High Speed, Low Gas Pressure

Solutions: Increase power, reduce speed, increase gas pressure. Fault 2: Thick, hard burrs at the bottom (increases post-processing workload)

Causes: Poor slag removal, high speed, low gas pressure, insufficient gas purity, high focal length

Solutions: Reduce speed, increase gas pressure, use high-purity gas, reduce focal length.

    III. Common Problems and Solutions for Nitrogen Laser Cutting (Stainless Steel/Aluminum Dedicated)

1. Insufficient Cutting Energy/Nitrogen Protection

Fault 1: Oxidation marks on the cut surface

Causes: Insufficient energy, high speed, unoptimized focal length, low power

Solutions: Reduce speed, increase power, optimize focal length.

Fault 2: Rough, dull cut surface

Causes: Insufficient energy concentration, low power, too low focal length

Solutions: Increase power, increase focal length by 0.1-0.2mm each time.

2. System centering deviation/asymmetrical airflow

Fault: Burrs on one side of the cut edge (smooth on the other side)

Causes: Incorrect cutting center calibration, nozzle wear/non-roundness, optical path misalignment

Solutions: Calibrate the cutting center, check/replace the nozzle, calibrate the optical path.

3. Excessive Heat Accumulation/Bottom Burr Formation

Fault 1: Continuous filamentous burrs at the bottom

Causes: Heat accumulation, incomplete slag removal, slow speed, high focal length, low gas pressure, overheating of the sheet metal

Solutions: Increase speed, decrease focal length, increase nitrogen pressure, cool the sheet metal.

Fault 2: Yellowing/Oxidation of the cut surface

Causes: Insufficient nitrogen protection, substandard purity, air/oxygen mixed into the gas path

Solutions: Check nitrogen purity, increase delayed exhaust, clean the gas path, check sealing.