The laser cutting machine will inevitably encounter some problems in the cutting process. This time, we have sorted out some common problems in the cutting process. Let's have a look together. 1、 What is the reason for the rapid pollution of protective glasses? First of all, it is necessary to determine the types of pollutants, which usually include waste residue, oil stains, dust, water mist and mixtures. 1. Waste slag: the main reason is that the cutting waste slag splashes back on the lens due to improper parameter settings. It can be solved by adjusting the process parameters of cutting or perforation, such as follow-up height, cutting air pressure, laser pulse parameters, etc. 2. Oil stain or dust: the auxiliary gas itself or the gas flow pipeline is polluted. Filter devices can be added to prevent and control, filter oil or dust. 3. Water mist: generally caused by excessive temperature difference. If the ambient temperature is too high and the cutting gas temperature is too low, and the protective mirror is formed by condensation in the ambient temperature, the two temperatures can be adjusted appropriately to make it similar. 2、 How to deal with the heating of the cutting nozzle of cutting carbon steel plate and what is the reason? With the increase of laser power, in order to pursue speed and section brightness, thick plates also began to use high-power vaporization cutting, which needs to be matched with small nozzles. Reasons for heating of cutting carbon steel: 1. The cutting gas flow is small, and the copper nozzle cannot be fully cooled. High pressure nitrogen can be used as auxiliary gas, and the cooling effect of high pressure nitrogen is good. 2. No copper nozzle is used to cool the gas. Matching the cooling gas of copper nozzle can reduce the calorific value of copper nozzle. 3. In high focus cutting, the laser is easy to hit the small nozzle, causing the nozzle to overheat. The focus must be adjusted or the nozzle diameter must be increased when the nozzle is not hot. 4. When cutting carbon steel, oxidation reaction occurs and a large amount of heat is generated. This situation cannot be avoided, and the distance between the nozzle and the material can be adjusted appropriately.