Daily use and maintenance of laser welding machine

The daily use and maintenance of the laser welding machine must be carried out by specially trained personnel, otherwise serious man-made damage will easily occur. During the maintenance process, we also need to pay attention to the following:

1. Equipment operators can often use black photo paper to check the laser output spot. Once uneven spot or energy drop is found, the resonant cavity of the welding torch laser should be adjusted in time to ensure the quality of the laser output beam;

2. Put the multimeter in the 2MW resistance range, insert the metal exposed parts of the two test leads into the cooling water in parallel at a distance of 1cm, and the resistance reading at this time should be at least greater than 250kW. If the reading is lower than this value, the torch cooling water should be replaced immediately;

3. Check the welding torch protection chain circuit stainless steel electrode: The cooling system is specially designed for the characteristics of laser equipment, with over-temperature sound alarm, over-temperature chain, flow switch chain, liquid level protection chain and other protective measures. During use, the above protection circuits should be checked frequently to ensure their normal and effective functions. The inspection work can be carried out when changing the water.

4. In order to ensure that the welding torch laser is always in a normal working state, after two weeks of continuous operation or when it is stopped for a period of time, the components in the optical path such as the YAG rod, dielectric diaphragm, and lens protection glass should be inspected first before starting up to ensure that all The optical components are free of abnormal phenomena such as dust pollution and mildew. If the above phenomena occur, they should be dealt with in time to ensure that the optical components will not be damaged under strong laser irradiation;

5. The purity of the cooling water is the key to ensure the laser output efficiency of the welding torch and the life of the laser condenser cavity components. During use, the conductivity of the internal circulating water should be checked once a week to ensure that its conductivity is 30.5MW?cm, and it must be replaced once a month. For the deionized water in the internal circulation, the conductivity of the newly injected pure water must be 32MW?cm. Pay attention to observe the color change of the ion exchange column in the cooling system at any time. Once the color of the resin in the exchange column turns dark brown or even black, replace the resin immediately;

6. In a high temperature or humid environment, during the operation of the welding torch laser, you should always pay attention to whether there is “condensation” on the cooling water circulation pipeline or the laser concentrating cavity due to low water temperature. “Condensation” will cause damage to the end face of the YAG crystal, resulting in a drop in output power or even failure to emit light, so attention must be paid to it during use. If “condensation” occurs, the use of the laser welding machine should be stopped immediately, and the condition of the YAG optical surface should be re-checked after the moisture on the surface of the condenser cavity dries naturally, to determine whether to clean the YAG rod, and then restart the machine after checking everything is normal. Pay attention to properly adjust the lower limit setting temperature of the thermostat before starting the machine. During normal operation, you should also pay attention to observe whether there is frost on the titanium tube of the refrigeration system. If there is frost, it may be caused by insufficient Freon in the refrigeration system. Relevant professionals should be asked to replenish and check for leakage.