Dear users, summer is the season with a high incidence of fiber laser failures in fiber laser cutting machines. The statistical results show that most of the faults of high-power fiber laser cutting machines are closely related to the user’s operating sequence and equipment operating environment. Most of the faults are caused by high temperature, which leads to high humidity and condensation of the fiber laser. To prevent this situation from occurring and reduce the equipment failure time and losses caused by it, the following is a special reminder:
1、 Mechanism of preventable faults
A fiber laser is a device that converts electrical energy into fiber laser energy, with a complex internal structure that involves multiple disciplines and fields such as optics, mechanics, electronics, and computation. Although fiber fiber lasers have lower environmental requirements compared to other types of fiber lasers, it is also necessary to ensure that the operating environment meets the requirements and that their own protective measures can effectively play a protective role. If there are omissions in the startup sequence, enclosure sealing, and water temperature setting, it may cause condensation on the surface of the electronic and optical components cooled by water inside the fiber laser due to the temperature difference between the inside and outside, thereby reducing the performance of the fiber laser and even damaging the fiber laser.
2、 Preventive measures
This measure mainly aims to prevent condensation of internal electronic or optical components, which can be divided into the following points:
1. Ensure that the chassis is sealed
The chassis of the fiber fiber laser adopts a sealed design and is equipped with an air conditioner or dehumidifier, in order to ensure that all components inside the chassis are in a relatively stable and safe temperature and humidity environment. If the chassis is not in a sealed state, high-temperature and humid air outside the chassis can enter the interior of the chassis. When encountering internal water-cooled components, it will condense on its surface, causing possible damage. Therefore, the inspection of the airtightness of the chassis should pay attention to the following aspects: A. Whether the doors of each cabinet are present and tightly closed. B. Are the lifting bolts at the top tightened. C. Is the protective cover of the unused communication control interface at the back of the chassis properly covered and is the used one securely secured.
2. Startup sequence
Due to the impossibility of completely sealing the fiber laser case, when the power is cut off at night, the air conditioning of the case stops working. If the room is not equipped with air conditioning or the air conditioning does not work at night, the external humid air can gradually penetrate into the case. Therefore, when restarting in the morning, it is necessary to pay attention to the following operating steps: A. Turn on the main power supply of the fiber laser (no light output), and let the chassis air conditioning run for about 30 minutes. B. Start the matching chiller, wait for the water temperature to be adjusted to the predetermined temperature, and enable the fiber laser to emit light. Note: If the equipment of the Chinese Russian IE and other series is equipped with temperature and humidity controllers, it is necessary to ensure that the air is in a pressurized state. When the temperature and humidity meet the requirements, the chiller will automatically start. C. Suggestion for normal processing: If possible, while ensuring safety, the fiber laser should not be powered off at night and the chassis air conditioning should be kept running. Alternatively, install the fiber laser in an air-conditioned room and keep the air conditioning running continuously and stably (including at night)
3. Water temperature setting
The temperature of cooling water has a direct impact on the electro-optic conversion efficiency, stability, and condensation. Normally, the cooling water temperature is set as follows: The water temperature of tap water (cooling fiber laser module) should be set at around 21 degrees Celsius.