Everything You Need to Know About Laser Marking.

Laser marking creates contrasts on materials and workpieces.

What is possible with laser marking?

Laser marking creates contrasts on materials and workpieces. When laser marking, metals and plastics are clearly and legibly marked with delicate graphics, 1-point fonts or even very small geometries. Laser marking guarantees consistent results. Some typical applications include:

High-contrast 2D codes such as data matrix for traceability
Permanent serial numbers for workpiece identification
Flexible logos and type designations for customer-specific product variants
Order-specific data plate processing
Labelling jewellery with manufacturer information
Personalisation of jewellery and other promotional items

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What is laser marking?

Laser marking is used to label, mark or personalize workpieces, products and various materials using a laser beam. It’s a durable method that is resistant to abrasion, heat and acid. There is flexibility in terms of shape, material and content:

Workpiece shapes can be very different – from flat sheets to complex components
Various materials can be marked
Content such as codes, numbers, text sections, logos and images are possible

What are the methods of laser marking?

Annealing

Annealing is a special type of laser marking for metals. The heat of the laser beam causes an oxidation process below the surface of the material, resulting in a colour change on the materials surface.

Discolouration

In discolouration, the heat from the laser beam triggers a chemical reaction in the material. Depending on the material composition, the result can create different colours. For example, if a light-coloured plastic is discoloured during laser marking, soot particles may be produced, resulting in a darker laser marking.

Laser engraving

Laser engraving melts and vaporises the surface of the material, removing material. This creates a depression on the surface of the material, which is the laser engraving.

Removal

In removal, cover layers that are applied to the base material are removed by the laser beam. Colour differences between the top layer and base layer create a contrast. Removal is often used on materials such as anodised aluminium, coated metals, foils or laminates.

Foaming

In foaming, materials are melted by the laser beam. This creates gas bubbles in the material, which diffusely reflect the light. The marking is therefore lighter than the areas that haven’t been processed. This type of laser marking is mainly used for dark plastics.

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Laser marking applications

Laser marking serves many applications, including complete traceability, brand communication or functional marking. There are nearly no limits to the fields of application and the number of products to be marked as large batches can be marked just as economically as individual components.

Industries where laser marking is used include mechanical engineering, electronics and semiconductor industry, medical technology, automotive industry, plastics processing, for the marking of watch parts, ball bearings and much more.

Advantages of laser marking.

Which materials are suitable for laser marking?

Depending on the material that you want to laser mark, different types of lasers such as fiber lasers or MOPA lasers can be used. The following materials can be marked with Trotec marking lasers:

Select material

Metals
Plastics
Paint
Foils and packaging
Plastic sheets

Fiber laser marking.

The fiber laser is ideal for marking metals by means of annealing, for metal engraving or for high-contrast markings on plastics. The result is of high quality, permanent and can be implemented in a time-saving manner. Fiber lasers are essentially maintenance-free and have a particularly long service life of at least 25,000 laser hours.

Laser marking metals

With a marking laser, soft metals such as aluminium or hard metals or alloys such as steel can be marked quickly and easily. With steel alloys, for example, it’s even possible to implement corrosion-resistant laser markings without damaging the surface of the metal using annealing marking. A variety of metals can be marked with the laser machine.

Metals suitable for laser engraving and marking are:

Stainless steel
Aluminium and anodised aluminium
Hardened metals
Alloyed steels
High-speed steels
Titanium, titanium alloys
Carbides
Brass
Copper
Precious metals such as silver and gold
Coated metals

Laser marking metals in the industrial sector.

Typical applications for laser marking or laser engraving metals are product labelling and coding for the electronics and electrical industries, mechanical engineering and toolmaking, sheet metal processing, medical technology or the automotive industry.

Areas of application in the industry:

Product labelling for plagiarism protection
Functional laser marking such as size and diameter
Production information like date of manufacture, batch number or serial number
Coding for permanent traceability
Data matrix codes for quality assurance
Data plates, machine markings and warning notices

Colour marking on stainless steel.

A special type of annealing marking on metals is colour marking on steel.
Based on the technical possibilities with the MOPA laser, colours can be marked largely reproducibly on stainless steel. For manufacturers of products made of high-quality stainless steel, this option opens up many new possibilities. With the special colour marking, company logos or functional markings can be offered, for example hot/cold water marking on stainless steel taps.

Typical industries for colour markings:

Kitchen appliance manufacturers who would like to adorn the stainless steel fronts of the appliances with their colour logo
Manufacturers of knives and cutlery who want to adorn their stainless steel products with colour logos
Engravers and job shops who want to expand their product portfolio
Processors of visible parts made of stainless steel in all possible industries who want to stand out from their competitors

What is the best laser marking machine for you?

Different machines are available depending on the field of application.

Large-format laser cutting machine: SP Series

The SP series laser cutters are the comprehensive solution for cutting large-format materials. Fast and reliable laser cutting for signage and display or plastic fabrication.

High-performance laser engraver and cutter: Speedy series

The fastest laser engraver on the market helps you make your daily work more profitable. Whether you are just starting your business or want to increase your production capacity.

Laser cutting is easy with the right software.

The laser software Ruby® makes working with the laser easier and faster. Easily create designs, graphics, photo and text elements, while adjustments can be made quickly with the integrated workflow. You can switch between the “design” and “preparation” steps at any time in software that is both a graphic and a laser program. With all the graphics tools that laser users need. The Ruby laser software enables direct file import of pdf, svg, png, etc. These functionalities halve the time from the idea to the finished product, without costs for additional software packages.

Interested in a laser cutter?
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From idea to finished product with laser technology.

The ideal tool for prototyping and digital manufacturing.

FabLabs, Maker Spaces, schools and universities use lasers for model making, industrial design, prototyping and many other DIY ideas. The incredible and inspirational design possibilities offered by laser technology are also ideal for all types of art and design projects: Laser machines are used to process a variety of different materials such as MDF, cardboard, or polystyrene. Laser technology gives users complete freedom in the development and implementation of all their ideas. Laser cutting in combination with laser engraving enables creative minds to create inspiring designs in just a few process steps.

Inspiration: Sample templates for laser cutting.

We offer a selection of laser samples that have been cut, engraved or marked with Trotec laser machines in the sample selection.
All samples are described in detail, complete with instructions and file templates that you can use straight away.

Laser samples with instructions and file templates

Interested in a laser cutter?
Contact us, we’ll advise you free of charge.