Laser cutting machine does not produce light, how to check

The fiber laser cutting machine does not emit light and requires systematic, safe and efficient investigation. Please strictly abide by the safety regulations, and be sure to operate after the equipment is completely powered off and the capacitor has been discharged, especially when checking the optical path components, you must wear the corresponding laser protective glasses. The following combing fiber laser cutting machine laser does not come out of the light emergency investigation flow chart, can follow this process step by step investigation:

Detailed description of each link and operation suggestions

Basic Status Check (most overlooked, but most common)

1. Water cooling system: check whether the cooling water temperature is within the set range (usually 20-25 ℃), and whether the water flow and pressure are normal. The triggering of the water protection switch will cause the laser to fail to power up.

2. Gas and pressure: cutting auxiliary gas (such as oxygen, nitrogen) pressure is up to the minimum value required by the equipment.

3. Power supply: check whether the power supply voltage of the laser and main cabinet is stable and whether the air switch trips.

4. General status of equipment:

• Is the emergency stop button pressed?
• Is the front/rear protection door closed and the sensor switch normal?
• Is the height of the processing head above the floating limit or collision?

Operation and software setup check

1. Software alarm: check whether there is red alarm information on the numerical control system, and deal with it according to the prompt.

2. Laser control signal:

• Check if the Laser Enable signal is sent.
• Check whether the “light control” (PWM/analog) signal is output. You can try to use the “point shot” or “test lamp” function of the control software (usually at low power).

3. Processing parameters:

• Is the current cutting power used incorrectly set to 0?
• Is the cutting pattern correct?

Laser Ontology Diagnostics (Core)

1. Observe the laser status lights and display: All brands of lasers have status indicators (RUN,ALM,OK, etc.) or display screens. Record any alarm code, which is the fastest way to locate the problem.

2. Listen to the sound: When trying to shoot, listen close to the laser to see if there is a relay or pump-driven sound. If there is sound but no light, the problem may be in the internal or external optical path.

3. Use the red light indicator (if equipped): activate the red light and observe whether the red light can be normally emitted from the cutting head. If there is no red light, the problem is likely to be inside the laser or at the front end of the fiber optic conduction path.

External optical path transmission inspection (key inspection area)

Warning: This part of the operation must ensure that the laser is completely powered off!

1.QBH/QCS fiber optic connector:

• Check the connection: Confirm that the fiber connectors connected to the laser and the cutting head are tight.
• Check the end face: carefully pull off the connector (to avoid contamination), and use a special optical fiber end face microscope to check for contamination, scratches, and burns. One of the most common causes of no light or power drop when the end surface is contaminated.

2. Transmission fiber: Check the entire fiber for severe bending (bending radius less than the minimum allowable value, usually> 15cm), indentation or trauma.

3. Inside the cutting head:

• Collimator: Check for contamination or damage.
• Focus mirror: Check for contamination, damage, or high lens temperature.
• Protective mirror: Check for rupture or serious contamination. Try to replace the protective mirror.
• Optical fiber cap: If the cutting head is removable, check whether the end surface of the “optical fiber cap” connected to the cutting head is clean.

Control signal and hardware inspection

1. Line detection: Check whether the control cable from the numerical control system to the laser (especially the light control signal line) is loose or damaged.

2. Interlock signals such as water protection and door protection: use a multimeter to check whether these safety interlock circuits are normally conducted.

3. Laser power template: If you have professional knowledge and conditions, you can check the indicator status of the internal power module of the laser.

Emergency Handling Priority Recommendations

1. First echelon (check immediately): water, electricity, gas status, software alarm, operation mode.

2. The second echelon (rapid diagnosis): laser alarm code, try low-power point shot, listen to the sound, look at the red light.

3. The third echelon (professional inspection): optical fiber connector end face, cutting head lens. This step requires professional tools and a clean environment.

4. Final step: If none of the above can be resolved, immediately contact the equipment manufacturer or laser supplier for technical support. And provide the steps you have checked and the alarm code of the laser, which can greatly improve the efficiency of remote support.

Safety reminder again: the laser energy is extremely high, do not look directly into the optical path or touch the optical fiber end face with your hands when the equipment is running. Non-professionals should not disassemble the laser core components.