Laser Welding Machine Not Emitting Light – Common Causes and Solutions

When a laser welding machine fails to emit light, it usually indicates an alarm or signal issue within the system. Below are the most common causes and troubleshooting methods to help you quickly identify and resolve the problem.

Laser Source Alarm

When the laser source has a fault, it can be detected in two ways:

Laser Source Indicator Alarm: The indicator light on the laser source turns red or flashes to show an internal fault.

System Interface Alarm: The control interface displays a laser source alarm message.

👉 Solution:

Connect the laser source to the upper computer software to check the detailed alarm code and description. Then, handle the issue accordingly (e.g., temperature error, power fault, communication error, etc.).

Chiller Alarm

The chiller ensures stable cooling for both the laser source and welding head. When it alarms, the laser automatically stops emitting to protect the system. The most common alarms include:

High Temperature Alarm: Usually caused by a compressor malfunction or insufficient refrigerant.

Flow Alarm: Typically due to blocked water pipes, a water pump failure, or a clogged filter.

👉 Solution:

Inspect the chiller’s operation status, confirm whether the compressor is working properly, and clean the water circuit and filters to maintain smooth water flow.

Laser Head Temperature Alarm

If the protective lens temperature in the laser head becomes too high, the system will stop output to prevent damage.

Main causes:

Lens contamination (dust, oil, or debris)

Damaged lens not replaced in time

Continuous long-term high-power operation

👉 Solution:

Regularly clean or replace the protective lens, check the water-cooling system, and ensure the laser head temperature remains within the safe operating range.

Other Possible Causes

In addition to alarms, some operational or connection issues may also lead to no laser output:

The laser head is not in contact with the workpiece, or the safety clamp is not engaged.

Poor contact of the safety clamp cable.

System buttons not activated or incorrect electrical level settings, preventing the laser from receiving the proper trigger signal.

👉 Solution:

Check each connection point, safety clamp signal, and system setting to make sure all conditions for laser emission are met.

Conclusion

When the laser welder doesn’t emit light, it’s often due to the system’s protection mechanisms responding to a fault. Operators should carefully check the alarm source and take action accordingly. Regular maintenance, lens cleaning, and proper chiller operation are key to preventing such issues and ensuring stable laser performance.

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