Three Major High-Frequency Quality Failures in Laser Cutting丨Quickly identify and resolve finished-product defects.

In laser cutting production, defects in finished products are the primary issue that most severely impacts on-time delivery and drives down the first-pass yield. In many cases, recurring minor malfunctions are not caused by hardware failure but rather by issues with parameters, components, or debugging details. Today, we’ve compiled the three most common cutting‑related defects that directly impact finished‑product quality, complete with precise root‑cause analysis and simple, efficient troubleshooting solutions. Even beginners can quickly get up to speed, swiftly eliminate imperfections, and restore normal production!

The cut surface is rough, with slag adhering to the edges.

This is the most common basic malfunction in laser cutting, directly resulting in uneven workpiece edges and excessive burrs, which significantly increases post-processing grinding effort and severely compromises both the finished‑part appearance and assembly accuracy.

The root cause of the failure

• Parameter mismatch anomaly: The combination of cutting power and operating speed is inappropriate—excessive speed coupled with insufficient power results in inadequate material melting.
• Auxiliary gas problem: the gas pressure is insufficient, or the gas purity is not up to standard, and the molten residue cannot be blown away in time
• Accessory loss and blockage: focusing lens pollution, wear and tear, decreased light transmittance, nozzle blockage, poor air outlet
• Cutting height deviation: the height of the cutting head is not calibrated, the focus position is offset, and the cutting energy is scattered

Simple Troubleshooting & Resolution

• Optimize cutting parameters: appropriately reduce the cutting speed, slightly increase the laser power, to ensure that the material is fully melted and cut.
• Check the gas circuit system: check whether the gas pressure of the equipment is up to the standard, replace high-purity nitrogen/oxygen, and clean up the impurities and blockage of the gas circuit.
• Repair and replacement accessories: clean the focusing lens, clean the nozzle debris, and directly replace the severely worn nozzle
• Calibration equipment parameters: recalibrate the height of the cutting head to ensure that the focus is in the best cutting position

Cutting dimension is not allowed, workpiece dislocation

The failure directly causes the workpiece scrap and assembly failure, which is a key problem affecting the production accuracy, mostly caused by equipment positioning, fixing and procedure problems.

The root cause of the failure

• Equipment accuracy deviation: machine tool guide rail, screw screw loose, long-term operation leads to positioning accuracy deviation
• Optical path and program problems: device optical path offset, or programming parameter setting error, program import exception
• Unstable workpiece fixation: the clamp is loose, the clamping force is insufficient, and the workpiece is slightly displaced and shaken during cutting.

Simple Troubleshooting & Resolution

• Fastening calibration equipment: tighten the guide rail and screw rod fixing screws one by one, recalibrate the positioning accuracy of the machine tool, and eliminate mechanical deviation
• Correct program optical path: check whether the optical path of the equipment is offset for debugging, check the cutting programming parameters, and correct the wrong program data.
• Reinforced workpiece clamping: adjust the clamping force of the fixture to ensure that there is no shaking or displacement during the cutting process of the workpiece, and the clamping is stable.

Cannot cut through the material

The high incidence of serious failures in production directly leads to the failure of workpiece forming and batch rework. The high probability is caused by abnormal output of energy, speed, accessories and equipment.

The root cause of the failure

• Insufficient laser energy: cutting power parameters are low, focusing lens aging, light transmittance decreased, the overall cutting energy attenuation
• Parameter ratio imbalance: the cutting speed is too fast, the auxiliary gas pressure does not match, the residue cannot be discharged in time, and the cutting penetration is hindered
• Abnormal laser: unstable laser output and optical path failure, resulting in insufficient cutting energy output

Simple Troubleshooting & Resolution

• Adjust the operating parameters: appropriately reduce the cutting speed, increase the laser power parameters, and improve the cutting penetration ability
• Repair and replacement accessories: check the state of the focusing lens, replace the aging lens in time, and adjust the gas pressure of the corresponding material.
• Troubleshooting equipment faults: check the operating parameters and working status of the laser, and troubleshoot problems such as optical path offset and abnormal output.