The Advantages And Process Of Laser Cutting Machine Processing Galvanized Sheet

Laser cutting machines are now being used more and more widely to cut various thicknesses of sheet metal, and also to cut galvanized sheet metal. Galvanized sheet is a common material in the manufacturing industry. Galvanized steel is coated with a layer of metallic zinc on the surface of the steel plate to prevent corrosion of the steel surface and extend its service life, it is mainly used for home appliances, civil chimneys, kitchen appliances, etc. So this material is suitable for laser cutting machine to cut?
For galvanized sheet metal, laser cutting machines can generally cut it easily. A variety of metal materials commonly used in industrial manufacturing systems can be cut, regardless of the hardness it has, almost all. Copper, aluminum and their alloy plates are no problem.

What is the best way to cut galvanized sheet? Cutting galvanized sheet has to be done with a laser cutting machine, of course.
There are two types of processing methods for laser cutting machines, cold processing and hot processing. The main methods are saw cutting, wire cutting processing, water cutting, shear cutting, punching processing, and drilling processing.
Metal processing with laser cutting equipment has been the main processing means of enterprises. During the processing of galvanized sheet metal, it is necessary to add auxiliary gases. The purity and pressure of the auxiliary gas directly affect the quality of the cut sheet section. The purity of oxygen used for cutting should be at least 99.6%. The higher the roughness and quality, of course, the higher the cutting cost will be. When laser cutting equipment is used for cutting, the purity of nitrogen gas should be at least 99.5%. Improving the purity of nitrogen ensures that the color of the slit does not change during the cutting of galvanized sheet. Laser cutting equipment has more advantages in cutting.
We all know that the principle and function of galvanized steel sheet is to protect the carbon steel inside by galvanizing the surface, which is a kind of thin sheet that does not rust easily for a long time. Although this kind of plate is slightly more expensive than ordinary carbon steel plate, it is still cost-effective from the overall point of view because it does not need to be painted to prevent rust and other post-processes. However, after laser processing, the situation is different. From the point of view of auxiliary gases, there are three general cutting processes for galvanized sheet steel, namely air cutting, oxygen cutting and nitrogen cutting.
Air cutting: The advantage is that the processing cost is extremely low. You only need to consider the cost of electricity for the laser itself and the air compressor. There is no need to incur high auxiliary gas costs, and the cutting efficiency on thin sheets can match that of nitrogen cutting, making it a cost-effective cutting method. However, it also has disadvantages. First, some of the bottom surface of the air cut will produce burrs, and the product after laser processing must undergo secondary processing such as deburring, which is not conducive to the overall product production cycle. Secondly, the air-cut section tends to turn black, which affects the product quality. Therefore, many companies are reluctant to choose the air cutting method in the processing of galvanized steel.
Oxygen cutting: This is the most traditional and standard cutting method. The advantages are low gas cost, no need to switch auxiliary gas frequently in the processing of mainly carbon steel sheets, and easy factory management. However, the disadvantage is that after oxygen cutting, there will be a layer of oxide on the surface of the cut surface. If the product is welded directly with the oxide, the oxide will fall off naturally after a long time. This is one of the reasons why galvanized sheet welding is prone to false welding.
Nitrogen cutting:Nitrogen is used for high-speed processing. Since nitrogen acts differently from oxygen used for combustion, it acts as a protector so that the cut part does not produce scale. Many companies value this advantage, so nitrogen is commonly used to cut galvanized steel. But here lies the disadvantage of nitrogen cutting: because there is no protection on the cut section, the product tends to rust and has to be repainted in order to prevent it from rusting. It is therefore a pity that galvanized sheets purchased at a higher price do not exhibit the characteristics of their galvanized coating.