Common problems and solutions of laser welding machines
As a high-precision processing equipment, laser welding machines are widely used in electronics, automobiles, aerospace and other fields. However, various faults are inevitable in long-term use, affecting production efficiency. This article will analyze six common problems and provide practical solutions and maintenance suggestions.
1. Unstable welding quality
Performance: Porosity, cracks or insufficient penetration in the weld.
Cause analysis:
1. Laser power fluctuation (unstable power supply voltage or laser aging)
2. Focal length offset (caused by thermal deformation or mechanical vibration)
3. Insufficient gas protection (low argon purity or abnormal flow)
Solution:
– Use a stabilized power supply and regularly detect the laser output power
– Check the focusing mirror position every 4 hours and use an infrared calibrator to adjust the optical path
– Replace the protective gas with a purity of more than 99.99%, and control the flow rate at 15-20L/min
Maintenance tips: Establish a welding parameter record table and compare historical data every time you change the model.
2. Abnormal equipment startup
Sudden situation: No response when starting or sudden shutdown during work
Key checkpoints:
1. Is the emergency stop button triggered?
2. Does the water cooler temperature exceed the 28℃ threshold?
3. Is the 380V main power supply phase balanced?
Processing flow:
1. Reset the emergency stop switch by rotating it clockwise
2. Clean the water tank filter and add special coolant
3. Use a multimeter to detect the three-phase voltage, and the fluctuation must be controlled within ±5%
Preventive measures: Install an intelligent monitoring module and send real-time SMS alarms for abnormal data.
3. Optical system contamination
Fault characteristics: Increased welding sparks and energy transmission efficiency decreased by more than 30%.
Pollution source investigation:
– Oil film on the lens surface (cutting fluid atomization adhesion)
– Oxidation of the optical fiber interface (excessive ambient humidity)