Laser Marking on Metal

Direct Part Laser Marking on Metal Parts

Laser marking machines are a popular choice for engraving and marking products with logos, text, and even barcodes. These machines are designed to provide precision results on various materials, including metals. Selecting a suitable laser marking machine for metals can make an impactful difference in the success of your project.

Depending on the type of material you are using, such as aluminium, stainless steel, iron, cemented carbide, copper, or other metal composites, there are different processes and techniques that you need to consider to achieve the desired finish. From ceramic-filled etching to deep engravings, assessing what features your laser marking machine needs before purchasing one is critical.

As an example, laser machines with high-speed capabilities and workstation flexibility may be necessary for certain metals, given their unique properties. Additionally, your choice should reflect the purpose of the chosen laser marking machine: is it mainly for industrial production or commercial use? Once you understand these and other important factors and outline your objectives appropriately, you'll be able to find the best laser marking machine that meets all of your metal marking requirements.

Keep reading if you’re in an industry that commonly uses metal components and are hoping to learn more about laser marking. In this section, we’ll discuss common applications and equipment for laser marking metal parts and how to choose the best machines for your needs.

Dark Metal Laser Marking

A dark metal laser marking is formed by heating the surface with a laser to form an oxidised layer. A laser marker with a fundamental wavelength, typically 1064nm or 1090nm, is recommended for either oxidation or surface annealing.

White Metal Laser Marking

White metal laser marking results when laser light irradiates the target, melting the surface and altering its reflectivity. With minimal surface damage and fast marking speeds these marks will appear white.

Deep Laser Engraving

Deep laser engraving is the process of cutting deep marks into metal, wood, plastic, and various substances by removing material through vaporisation. This process creates depth as it displaces the material being used.

Cast aluminium engraving

Metal Laser Processing

Metal laser processing occurs through many types of production processes such as cutting, cleaning, peeling, or even welding. With KEYENCE's variety of laser wavelengths and 3-Axis technology you can find the correct laser for every job.

Metal Engraving Machines

Metal engraving machines are important and versatile tools for various industries. These machines precisely engrave or etch intricate designs into metal surfaces. However, laser engraving metal does differ a bit from laser marking. Metal engraving places information into the target via penetrating the surface and material removal, while metal marking is faster and achieves surface level colour contrast.

In either case, laser engraving metal is a common practice by many businesses across the globe. Jewelers and artists use these machines to create customised jewelry pieces and works of art. Manufacturers also use them to etch logos, serial numbers, and other imprints onto products for identification purposes. The medical industry, for example, employs this technology for engraving implants with patient information. Metal engraving machines offer quick, high-precision etching solutions with heavy-duty results.

Laser Marking Metal Use Case Examples

Marking Aluminium for Aerospace Laser Marking

Aluminium and aluminium alloys are frequently used for aerospace part marking because of their conductivity, minimal weight, flexibility, and low cost. With that, each aluminium component is required to have a 2D code with the component’s manufacturing information.

Laser engraving is often used for marking aluminium because it is permanent, environmentally friendly, precise, and compatible with the metal. Unlike other methods that add force and risk distorting the flexible aluminium, laser marking metal is no-contact and doesn’t change any aspect of the aluminium besides the target area.

Marking Stainless Steel for Medical Devices and Aerospace Part Marking

Stainless steel is a metal commonly used for the medical device and aerospace industries. It is anti-corrosive, tolerant to high temperatures, and has a high tensile strength.

Since laser markers make stainless steel marking much easier than other marking methods, both industries rely heavily on laser marking to add traceability and identification marks on their stainless steel parts.

The hardness of stainless steel can make it difficult to mark without a laser. Additionally, some marking methods, like chemical etching, can cause the steel to lose its anti-corrosive layer. Laser marking metal targets only the precise area so that you can mark stainless steel without any adverse effects. With laser markers, you can also mark with an anneal style mark which gives contrast on stainless steel while keeping the anti-corrosive layer intact.

Best Machines for Laser Marking on Metal

When deciding which laser marking machines are best suited for your needs, there are several factors to consider. First and foremost is your budget, as these machines can vary significantly in price. Additionally, you’ll want to take into account any special features you may need, such as speed control or software compatibility. Finally, you should think about how you plan on laser marking metal parts. Additional factors, like focal distance and the geometry of your part, will play an important role in your laser marking set up. However, the 3-Axis Hybrid Laser Marker can eliminate these types of factors as a concern.

3-Axis Hybrid Laser Marker

A hybrid laser marker is a combination of a YVO4 laser marker and a fibre laser marker. This combination means that this laser includes the high quality and depth of focus of a YVO4 laser marker, as well as the long service life and high output of a fibre laser.

The hybrid laser can anneal, etch, engrave, and mark dark and white marks.

3-Axis Fibre Laser Marker

A fibre laser marker is a laser marking machine for metal that offers a high-speed and powerful laser. This makes it ideal for high-quality annealing, deep engraving, and cutting. It includes model options for a 30 W or 50 W laser, and it's known for its compatibility with metals.

KEYENCE’s Lasers

KEYENCE’s lasers are strapped with laser beam automation and software to improve your user experience regardless of your target shape or material.

KEYENCE’s Machine Features

KEYENCE’s MD-X Series lasers include XY and Z tracking to ensure a high quality mark every time. The Z tracking uses a built-in sensor to measure the distance between the machine and the target. The distance measurement allows the laser to re-focus based on tilt, positioning, and height. Likewise, the XY tracking adjusts for any deviations between expected part placement and the actual placement.

All KEYENCE’s lasers include 3-Axis control that allows the laser to mark complex shapes without distortion. Instead of marking on one plane, the beam can maneuver multi-plane shapes like stepped, cylindrical, circular cones, and inclined surfaces.

KEYENCE’s Software Features

If you use KEYENCE’s software features, then you will never have to guess how your mark will turn out. KEYENCE’s software, called the Marking Builder Plus, includes on-screen guidance to preview your mark on the target. You can check marking alignment on a 3D CAD profile of your target, even if it’s a complex shape.

The software also has a Marking Conditions Navigator, which contains pre-made settings for different styles of marks on all types of materials. Just pick the material and the style of mark that's desired, and the software will give settings to achieve it.

Find Your Perfect Machine for Laser Marking Metal

As you see, laser marking machines are an excellent choice for businesses looking to mark metal surfaces. With their high level of precision and accuracy, these machines provide businesses with reliable results in a cost-effective manner. Choosing the right marking equipment can seem intimidating, but KEYENCE’s diverse and industry-leading collection of laser markers will help your metal marking projects go smoothly. We offer rapid support, personalised integrations, and same-day shipping to get you up and running quickly. Contact us today to find your perfect laser marker!

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