Unique Qualities of Laser Beams and How The Laser Cutting Process WorksPosted on November 01, 2017 by Hygrade Laser Profiling, in News
What makes laser light unique?
Laser light and laser beams have a range of special properties that enable their use as a tool. Laser light is monochromatic, therefore all light waves have the same wavelength. These light waves oscillate in phase with one another, all running practically parallel to each other. Due to this, the beam widens only a small amount. The laser beam is also significantly brighter than that of more traditional light sources.
Why is a laser beam ideal for production?
A laser beam is an ideal production tool, with a non-contact, wear-free approach – especially when compared to methods that favour large tools exerting huge forces on the sheet.
Lasers can produce incredibly accurate contours and structures, while heating the material locally.
This means that the workpiece isn’t exposed to thermal stresses – or at the most, they are minimal. Thanks to the versatility and flexibility of laser light, a variety of forms and contours can be made using just a single machine.
What happens when cutting and drilling with a laser?
When a focused laser beam hits the workpiece, it heats up the material causing it to either melt or evaporate. The cutting process can start once the beam has fully penetrated the workpiece. The laser beam moves along the part contour, melting the material.
Generally, a gas flow blows the melt down and out of the kerf, which is not much wider than the focused laser beam itself. While the laser drills, a short laser pulse with high irradiance melts and evaporates the material. A high pressure is in turn generated, and the melt is forced out of the hole.