Dialing is divided into two main categories: “contact dialing” and “contactless dialing”. Laser marking is a type of non-contact marking. This section presents the basic principles and characteristics of laser marking, as well as examples of it.
Principles of laser marking:
Laser marking is used to mark on a product, logos, product names, serial numbers, model numbers, and other information, by irradiating the object with laser light to melt, burn, peel, oxidize, cut or discolor its surface. Laser markers can be roughly divided into two types: masking laser markers and scanning laser markers.
Laser light is applied to a masked surface, and only the parts that pass through the mask are marked. Masking allows for high-speed, high-resolution marking, but masks must be prepared to match the content being marked.lasitlaser.com This translates into increased labor and costs, having to mark various patterns.
Scanning irradiates an object with a single laser beam, and marking is done in a stroke-like motion. More specifically, a laser beam emitted from an oscillator is captured (scanned) by a scanning mirror and applied to the surface of the object to mark it. Conventional scanning methods only allow control of the X and Y axes, which means that the light can only be scanned on a flat surface. However, today’s laser markers can control the height of the Z-axis, using a scanning mirror, making it possible to mark a wide variety of objects in various ways. These scanning mirrors are called Galvano mirrors, and a system that uses one or more of these mirrors is called a “Galvano scanner” or “Galvano mirror scanning system.”
Recently, multi-type marking applications have become common, and the high-speed capabilities of scanning lasers help cover weaker aspects of production. This has resulted in an increase in sweep systems that allow a greater degree of freedom.
Advantages of laser marking:
This section explains the advantages of laser marking compared to stamping, labeling, engraving, and marking methods.
High precision marking:
Laser markers use a laser light that is irradiated on a specific point, which enables high-precision marking. Even small characters can be easily identified, ensuring reliable quality control.
Marking without fading:
With labeling and printing methods, labels or printed surfaces can peel or fade, making it impossible to identify printed content. However, with laser marking, there is no need to worry that the marked content will disappear over time.
Various marking methods:
Lasers can be used for a wide variety of marking methods, including melting or burning the surface, peeling veneer or paint, rusting, and discoloration. Selecting the best marking method ensures damage-free marking, regardless of the material of the object.
When the base material is irradiated with a laser, gas bubbles are generated within it, due to the thermal effect of the radiation. Evaporated or gassed bubbles are trapped in the surface layer of the base material, creating a whitish swelling. These bubbles are particularly visible on dark base materials and result in a “thin” coloration.
When the base material absorbs the energy of the laser, the thermal effect increases its molecular density. The molecules condense and the color changes to a darker color.
When the area is continuously receiving high energy, the element macromolecules around the base material carbonize and turn black.Click here .
The “pigment” elements in the base material always contain metal ions. Laser radiation changes the crystal structure of the ions and the level of hydration in the crystal. Consequently, the composition of the element itself changes chemically, which results in the development of color, due to the greater intensity of the pigment.