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Why a Laser Welding Machine Is Not Emitting Light: Common Causes and Solutions
szhaiwei
2025-09-04
When a laser welding machine fails to emit light, production stops immediately. While this issue can be frustrating, most causes are systematic and can be diagnosed step by step. Understanding the root reasons behind laser welding not emitting light helps reduce downtime and supports informed decision-making for maintenance or equipment selection.
1. Power and Interlock Issues
Check if the machine is properly powered and all safety interlocks are closed. Open cabinet doors, disconnected foot pedals, or emergency stops not reset can prevent the system from enabling the laser. Also, verify that the main power supply matches the machine’s voltage and phase requirements.
2. Laser Source Faults
The laser generator (fiber, disk, or diode) must be active. If the source isn’t powered or shows an error code, refer to the manufacturer’s manual. Common issues include cooling system faults, internal communication errors, or component aging. Many systems log error codes that point directly to the problem.
3. Cooling System Failure
Laser sources require stable cooling. If water temperature is too high, flow is blocked, or the chiller is off, the system will disable lasing to prevent damage. Regularly inspect coolant levels, filters, and pump operation.
4. Optical Path or Beam Delivery Problems
Misalignment in the beam path, dirty or damaged protective windows, or fiber disconnections can interrupt light transmission. Inspect the delivery fiber and welding head for physical damage or loose connections.
5. Software and Parameter Settings
Ensure the correct welding program is loaded and output parameters (power, pulse mode) are set properly. A setting of 0% power or incorrect trigger signal can result in no emission, even if the system appears ready.
For users, choosing a laser welding machine with clear diagnostic feedback, modular components, and accessible service points can significantly reduce troubleshooting time. Always follow the manufacturer’s maintenance schedule to avoid preventable failures related to laser welding not emitting light.
REPORT