Common Faults and Solutions of Fiber Laser Power Supply

Fiber laser power supply is an indispensable component of modern laser processing technology and is widely used in laser cutting, welding, marking and other fields. Although laser power supply is favored for its high efficiency, low maintenance cost and excellent beam quality, some common faults may still be encountered in actual use. Understanding these faults and their solutions is crucial to improving the reliability of equipment and processing efficiency. This article will discuss in detail the common faults of fiber laser power supply and their solutions.

1. Unstable Laser Output

• Cause

Unstable laser output is one of the most common problems in fiber laser power supply, which may be caused by the following factors:
Power supply failure: Damage or aging of internal components of the power supply leads to output power fluctuations.
Poor fiber connection: The connection between the fiber and the laser or processing head is loose or damaged, affecting laser transmission.
Cooling system problem: Failure of the cooling system causes the laser to overheat, thereby affecting the laser output.

• Solution

Check the power supply status: First check the indicator light and alarm information of the power supply to confirm whether the power supply is working properly.
Check the fiber connection: Make sure the fiber connection is firm, check whether the fiber end face is clean, and clean or replace it if necessary.
Check the cooling system: Make sure the cooling system is operating normally, check the water flow and temperature, and perform maintenance if necessary.

2. Insufficient Laser Power

• Reason

Insufficient laser power may lead to unsatisfactory processing results. Common reasons include:
Fiber damage: Physical damage or contamination of the optical fiber reduces the laser transmission efficiency.
Gain medium aging: The performance of the gain medium decreases with the increase of usage time, affecting the laser output power.
Improper power setting: The power setting of the fiber laser power supply does not meet the processing requirements, resulting in insufficient output power.

• Solution

Check the optical fiber: Check the optical fiber regularly for damage or contamination, and clean or replace it if necessary.
Check the gain medium: Confirm the status of the gain medium. If it is severely aged, it needs to be replaced.
Adjust the power setting: Make sure the power setting meets the processing requirements, check the power output setting, and adjust it if necessary.

3. Overheating

• Reason

Overheating of the fiber laser power supply may cause equipment failure. Common reasons include:
Cooling system failure: Insufficient cooling water flow or cooler failure causes the laser temperature to be too high.
Excessive ambient temperature: The working environment temperature of the equipment is too high, affecting the cooling effect.
Long-term high-load operation: Long-term high-load operation causes increased equipment heat generation.

• Solution

Check the cooling system: ensure that the cooling water flows smoothly, check the working status of the water pump and cooler, and perform maintenance if necessary.
Improve ventilation: ensure good ventilation around the equipment, reduce the ambient temperature, and use air conditioning equipment if necessary.
Reduce the load: in a high temperature environment, appropriately reduce the workload of the fiber laser power supply to avoid overheating.

4. Laser Beam Deviation

• Reason

Laser beam deviation will affect the processing accuracy. Common reasons include:
Fiber bending or damage: The fiber is affected by external forces, causing the fiber to bend or damage.
Poor optical path alignment: The alignment of the laser optical path is inaccurate, causing the laser beam to deviate.

• Solution

Check the optical fiber: Make sure that the optical fiber is not excessively bent or damaged, and replace it if necessary.
Adjust the optical path: Check the alignment of the laser optical path, ensure that the beam is correctly focused, and adjust it if necessary.

5. Frequent Tripping

• Reason

Frequent tripping may cause production interruptions. Common reasons include:
Power supply overload: The load of the laser power supply exceeds the rated range, causing tripping.
Short circuit or grounding fault: There is a short circuit or grounding problem in the internal or external circuit of the fiber laser power supply.

• Solution

Check the load: Confirm that the load of the fiber laser power supply is within the rated range to avoid overload.
Check the circuit: Check the circuit connection of the power supply to ensure that there is no short circuit or grounding problem, and repair it if necessary.

6. The Laser Cannot Start

• Reason

The failure of the laser to start may be caused by the following reasons:
Power failure: The power supply cannot be supplied normally, resulting in the failure of the laser to start.
Control system problem: The control system fails or is improperly set, resulting in the failure of the laser to start.

• Solution

Check the fiber laser power supply: Confirm that the power supply is supplied normally, check the status of the power indicator, and perform repairs if necessary.
Check the control system: Ensure that the control system works normally, check the software settings and connections, and adjust them if necessary.

7. Fiber End Face Contamination

• Reason

Fiber end face contamination will affect the quality of laser output. Common reasons include:
Environmental dust or oil: Dust or oil in the working environment adheres to the fiber end face, affecting laser transmission.

• Solution

Regular cleaning: Use special cleaning tools and solvents to regularly clean the fiber end face to ensure that the fiber is clean and avoid contamination affecting laser output.

8. Unstable Laser Frequency

• Reason

Unstable laser frequency may affect the processing effect. Common reasons include:
Improper fiber laser power supply control: The laser frequency is not set correctly, resulting in frequency fluctuations.
Environmental interference: External electromagnetic interference or temperature changes affect the laser frequency.

• Solution

Check the control parameters: Make sure the laser frequency is set correctly, adjust the control parameters, and calibrate if necessary.
Reduce interference: Make sure the fiber laser power supply is away from the source of electromagnetic interference and maintain a stable working environment.

Conclusion

Fiber laser power supply plays an important role in the field of laser processing, but they may encounter various faults during use. Understanding these common faults and their solutions will help improve the reliability and work efficiency of the equipment and ensure the smooth progress of laser processing. Regular maintenance and inspection are the key to ensuring the long-term and stable operation of fiber laser power supplies. By timely discovering and solving problems, the service life of the equipment can be effectively extended, production costs can be reduced, and production efficiency can be improved.

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