Mar 07 , 2023
During the laser gasification and cutting process, the material's surface temperature rises rapidly to the boiling point temperature, preventing melting caused by heat conduction. As a result, a part of the material vaporizes and disappears while another part is ejected from the bottom of the cutting seam by an auxiliary gas flow. This process requires very high laser power and is only suitable for laser cutting application where molten material exclusion is necessary. The metal pipe cutting laser machine is mostly used in a small application field of iron-based alloys.
To avoid the material vapor from condensing on the slit wall, the material's thickness should not exceed the laser beam diameter.
This process partially melts the workpiece, and the molten material is dispersed with the help of airflow. As the transfer of material only occurs in its liquid state, it is known as laser melting and cutting.
In the melting process and cutting sheet machine, the use of inert gas is standard. However, replacing it with oxygen or other active gas would result in the material igniting under the laser beam's radiation. The intense chemical reaction with oxygen generates another heat source, further heating the material, known as oxidation melting and cutting.
Controllable fracture cutting leverages laser beam heating to achieve high-speed cutting for brittle materials vulnerable to damage by heat. The laser beam heats a small area of brittle material, creating a large thermal gradient and serious mechanical deformation generating cracks in the material. As long as the uniform heating gradient is maintained, the laser beam can guide the crack to generate in any desired direction.