Before you buy a laser marking machine you need to understand the difference between marking, engraving and etching.

While terms like laser marking, engraving and etching are often used interchangeably by laypeople, there are differences between these three methods. Before you choose a laser marking machine, it is important that you understand the differences between these three marking processes to ensure that the machine you purchase meets your needs.

Laser Marking Process

Laser marking is achieved by slowly moving a low power beam across a surface in a method known as color changing. The laser heats the material, causing oxidation under the surface and turning it black. The surface is then annealed using a low temperature. This process creates a high contrast mark without causing any damage to the material.

Laser Engraving Process

The laser engraving process involves the laser beam removing the surface of the material to reveal a cavity, which then displays an image. During the engraving process, the laser produces high heat that vaporizes the material, leaving a cavity on the surface. Laser engraving is a fast process, although to create deeper marks, the process needs to be repeated several times.

Laser Etching Process

Laser etching is a subset of laser engraving. The process involves the heat of the light beam melting the surface of the material. As the melted material expands, a raised mark is created. Laser etching can be performed on bare, anodized or plated metal surfaces, as well as on ceramics and polymers.