What types of laser cutting operations and process types are there?

Update:06 Sep 2019
Summary:

  The first is melt cutting. When this type of las […]

 

The first is melt cutting. When this type of laser cutting process is employed, as the power density of the incident laser beam increases, when a certain value is reached, the inside of the material at the position of the illumination spot begins to evaporate and gradually forms a hole. As long as such a small hole appears, a large amount of incident beam energy can be quickly taken in. These apertures will then be surrounded by the molten metal wall, after which the auxiliary airflow coaxial with the beam will carry away the molten material around the hole.

At the same time, due to the movement of the workpiece, these small holes will gradually traverse along the cutting direction of the laser cutting to form a slit. At the same time, the laser beam will continue to illuminate along the leading edge of the slit, and the molten material will continue to blow or pulsate away from the slit.

The second process is actually a vaporization cut. That is to say, in the laser cutting process, since the high power density laser beam is continuously heated, the temperature of the material will gradually increase until the boiling point temperature is reached, and the process is very rapid, so that melting due to heat conduction can be avoided, so Some of the material disappears by vaporization into steam.

There is also a process called controlled fracture cutting. This type of process is typically applied to brittle materials that are susceptible to damage after being heated. In the laser cutting process, high-speed, controlled cutting by laser beam heating controls the fracture cutting, in which case the laser beam can be used to guide the crack in any desired direction.