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Laser Marking

Application - Laser Marking

Pulsed Fiber Lasers are renowned for their versatility with laser marking being one of the most popular applications. This process is used to mark various materials including ceramics, LEDs, metals, plastics and rubber. Although similar to laser engraving, the appliance of a mark is at a surface level, whereas engraving is a mark with depth. Laser marking is the process where a material, which can be anything from ceramics to plastics to metals, is marked or labelled with a simple black mark, or in colour (depending upon the material).

Popular laser marking applications

Laser marking is typically used for processes such as applying labels with bar codes, date codes, QR codes, serial numbers, part numbers or adding copyright / trademarks and logos to a number of different surfaces in many industries. Another popular use is the addition of a date value being added to materials such as metals and plastics; this could be used as a best before date or maintenance due date, etc. Additionally laser marking is useful in the creation of ID and smartcards offering high degrees of fraud prevention.

Advantages

Laser marking offers advantages over other marking methods of mark durability, lower use of consumables, repeatability and reductions in process times. Laser marking is extremely popular in the manufacturing industry and is widely integrated into sub-processes across the production line. Buy the perfect Raycus Laser for you, we apply a range of Pulsed and CW Fiber Lasers which will exactly match the beam quality and power level required for the marking task needed.

Laser Marking in the Aerospace Industry

Laser Marking in the Electronics Industry

Laser Marking in the Medical Industry

Laser Marking in the Semi-conductor Industry

Laser Marking in the Automotive Industry

Anneal Marking on Cast Iron

Copper Marking

VIN Marking on Mild Steel

Raised Marking

Titanium Colour Marking

Black Marking on Brick

Anneal Marking

Brass Colour Marking

Smooth Marking of White Plastic

Marking Plastic Tags

Marking Painted Steel

Marking of Clear Anodised Aluminium

Marking of Anodised Aluminium

Marking of ABS black plastic

Marking FR4 PCB

Marking Electronic Epoxy

Hallmarking

Stainless Steel Color Marking

Laser annealing →Color Change/Frothing →Color/Material Removal →Carbonizing → Engraving
Our laser marking process is simple and efficient, simple is natural.
Annealing marking is when an oxide layer is created on ferrous metals (iron, steel, high-grade steel) and titanium through localized heating.

Generally, the oxide layer is black, but it can also have other annealing colors (such as yellow, red and green). The color depends on the temperature of the heated layers.

The material surface remains even during annealing because nothing is removed from it; the color change is achieved through localized material heating only.

The heat usually penetrates 20 to 30 µm deep in the metal surface. This makes the marking non-abrasive and ensures that it can be removed by re-heating (min 700°C for ferrous metals).

Color Change/Frothing → Annealing → Color/Material → Rremoval → Carbonizing → Engraving
Plastics absorb laser light. The color pigments (from additives, colors etc.) and carbon in plastics are destroyed and vaporize as a result of localized heating. A color change becomes visible and the frothing of the material can be felt.

The carbon in the plastic oxidizes to form CO2, which comes out of the plastic and forms a layer of froth.

The discoloration is either lighter or darker depending on the composition. Dark plastics discolor to white at the places to be marked, while light plastics discolor to gray or black (see carbonization).

Discoloration and frothing appear exclusively in case of plastics

Color Removal / Material Removal → Annealing → Color Change/Frothing Carbonizing Engraving
Marking by removing color and material is used especially in coated materials and anodized aluminum as well as in fittings, packaging materials and labels. The existing color, coating and surface layers are partially removed and the base material becomes visible.

The layers to be removed absorb the laser light, the material heats up and vaporizes at relevant places. Since the surface layer and protruding base material have different colors or the base material is often also back-lit, the marking becomes clear and visible.

Since the final markings are very rich in contrast, this laser marking procedure is mainly used in the automobile industry for the day/night design, in the marking of the most varied control elements and keyboards as well as in the packaging industry.

Carbonizing → Annealing → Color Change/Frothing → Color/Material → Removal Engraving
In case of carbonization using laser, the laser marked material always gets a darker color.
Plastic bonds are broken and the carbon from these bonds is released. The discoloration thus produced ranges between gray to blue-gray and black.
Carbonization is used for light plastics and organic materials (paper, packaging materials, wood, and leather), in which the color changes from light to dark.

Engraving → Annealing → Color Change/Frothing → Color/Material → Removal → Carbonizing

In case of engraving using laser marking, material is taken out or removed from the surface of the component to be processed. This marking effect can be created in almost all materials.

Especially metals, plastics and ceramics are engraved using laser markers. The laser beam penetrates into the surface and removes it, so that there is a visible depression of up to 50 µm in that area.

Since the material gets simultaneously heated and reacts with the ambient air, there is often a discoloration at the engraving areas, which stand out more distinctly due to the laser marking.
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