As winter comes, the temperature drops sharply. In order to better protect the laser and ensure the normal operation of the laser in winter, we hereby remind all partners and users to take anti freezing measures for the laser in winter. 1. Since the laser equipment uses water as the cooling medium, the operating ambient temperature of the laser should be above 5 ℃. 2. In winter, if there is no heating in the workshop, or the ambient temperature may be lower than 5 ℃. If the laser does not work at night or on weekends, the machine tool can still be turned on. In this way, the cooling water is still in circulation and will not freeze. 3. If your factory or workshop has a long holiday and the machine tool is not running during the holiday period. Be sure to pay attention to the thermal insulation treatment of the machine tool in winter. The water of the chiller, the laser, the cutting head and the lens must be drained to prevent the damage of the machine tool caused by icing. Basic principles and methods of antifreeze All liquids have a "freezing point". When the liquid temperature is lower than this "freezing point", it will solidify to form a solid, while the volume of deionized water or purified water will become larger during the solidification process, which will "support" the pipeline and sealing connection of the water cooling system and cause damage. In order to avoid damage to the laser, output head and water cooler caused by solidification of cooling liquid, there are three solutions: 1. If there is no power failure in the local area, do not turn off the water cooler at night to ensure that the coolant is in circulation and the temperature is not lower than the freezing point. 2. Drain the cooling liquid in the laser, laser output head and water cooler after use every day. 3. Use proper antifreeze as coolant. Note: Any antifreeze cannot completely replace deionized water and cannot be used for a long time all year round. After winter, the pipeline must be cleaned with deionized water or purified water, and the use of deionized water or purified water as coolant must be resumed.