In daily operation, the performance and stability of a laser welding machine for metal can be affected by the working environment, operating practices, and maintenance conditions. Users may occasionally encounter issues such as alarms, no laser output, or rapid wear of protective lenses. Based on practical experience, this guide provides a systematic overview of common problems and troubleshooting approaches to help users quickly identify issues and improve operational efficiency.

💎Laser Alarm Issues
Laser alarms are often related to the cooling system, optical path connections, or water circulation. The following checks are recommended:
✨Cooling System Abnormalities
Ensure that the chiller is powered on and operating normally, and check for any alarm indicators. Cooling system issues are one of the primary causes of laser alarms.
✨QBH Fiber Interface Alerts
If the alarm originates from the QBH interface, it may indicate a loose connection between the fiber head and the collimator. Since this involves the optical path, it is recommended to have professional after-sales personnel handle it and not attempt disassembly on your own.
✨Water Circulation Issues
Blocked internal water channels or air trapped in the cooling pipes can also trigger alarms. Inspect the water flow and, when safe, bleed the system to restore normal circulation.
💎No Laser Output
When the laser fails to emit light, troubleshooting should proceed from simple checks to more complex ones:
🎉Basic Operational Status
Verify that the laser power is on. Check whether the red pilot light is visible at the welding head, confirm that the "Enable" indicator on the control panel is illuminated, and check for any alarm messages.
🎉Scanning or Galvo Mirror Malfunction
If the red light is not visible but the laser shows no alarms and is in an enabled state, the scanning or galvo mirror may be damaged. On-site replacement by qualified personnel is required.
🎉Laser Control or Authorization Issues
If the red light is visible and there are no alarms, but pressing "Enable" does not activate the system, this may be related to the control mode or laser authorization. Connect the laser to a computer to verify the control mode and ensure the necessary permissions are correctly applied.
🎉Safety Interlock Not Engaged
If all of the above checks are normal, confirm that the safety interlock on the touchscreen is engaged and that the welding gun is properly grounded. Incomplete safety interlock conditions will prevent fiber laser output.
💎Rapid Wear of Protective Lenses
Protective lenses are consumable parts. Rapid wear is generally caused by the following factors:
✅Insufficient Shielding Gas
Failure to provide adequate shielding gas exposes the lens to spatter, accelerating wear.
✅Excessive Laser Power
Operating at high laser power, especially above 90%, increases spatter intensity. Using slight defocusing techniques can help reduce the impact on the protective lens and extend its lifespan.
✅Improper Welding Angle
Maintain the welding angle between 0°–65° relative to the workpiece surface. Avoid perpendicular (90°) incidence. Special attention should be paid when welding reflective materials such as aluminum.
💎Water Tank Alarms
Common causes of water-related alarms include:
🔔High Water Temperature
Excessive water temperature triggers protective alarms. In this case, shut down the machine and check that the cabinet exhaust vents are unobstructed to ensure proper heat dissipation.
🔔Abnormal Water Flow
Water flow alarms are often caused by bent, compressed, or blocked hoses. Inspect the water lines individually to ensure there are no blockages or sharp bends.
📢📢Conclusion
Laser metal welding machines are highly precise, integrated systems, and any abnormality in a single component can affect overall operation. By systematically analyzing common fault symptoms and following structured troubleshooting procedures, downtime can be minimized, and production efficiency improved.
It should be noted that this guide covers only some typical issues. For problems that cannot be diagnosed or involve the optical path or electrical systems, always contact professional after-sales personnel to avoid risks associated with improper handling.

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