Laser Marking vs Engraving vs Etching: When choosing between these methods, it mainly comes down to how deep the mark needs to be and how much you want to affect the surface.
The terms laser marking, laser etching, and laser engraving are often used interchangeably, each describing the process of creating permanent marks on a part using a computer-controlled laser beam. However, the terms actually refer to three distinct processes that deploy a laser slightly different ways, producing marks of different depths and tones.
At the most superficial level, laser marking techniques like laser coloration alter the appearance of the material without removing sections of it. Instead, the laser changes the surface through processes such as oxidation, annealing, or color change. Laser etching goes a step further by melting the material’s surface, causing it to expand slightly and form a textured mark. Laser engraving, by contrast, removes material entirely, carving a deeper recess that can often be felt with a fingertip.
All of these processes work via different mechanisms, but each produces a similar result: a clear, durable marking that allows manufacturers to tag parts with barcodes, serial numbers, logos, and other important information. This article discusses the main differences between laser processes, helping you decide which you will need on your next order with 3ERP.
What is Laser Marking?
Laser marking or laser labeling is a family of non-contact marking processes that use a beam of light to create a permanent black or dark mark—a barcode, for example—on the surface of a material. The high heat of the laser causes a visible change in the material surface, allowing for high-contrast marking that is durable compared to ink-based marking.
Although laser marking may be used to refer to all laser-based marking processes (including engraving and etching), here we will use it—as many engineering companies do—to refer to laser marking processes that do not create significant geometrical changes to the material surface.
Unlike laser engraving, this type of laser marking does not involve the removal of any material. Instead, high heat causes a process of discoloration, oxidation, carbonization, foaming, or annealing on the surface, resulting in dark marks but typically no change to the surface geometry.
Subtypes of laser marking include laser coloration, laser foaming, and laser annealing.
Because laser marking can create durable markings without surface penetration, it is useful for high-speed part identification (serial numbers, barcodes) or branding, or for parts where any level of surface penetration could be unacceptable, such as in sensitive industries like aerospace and medical.
Laser Marking Benefits:
- Fast
- Cost-efficient due to low power usage
- Non-invasive and non-destructive
- High-contrast and good readability
- Suitable for thin substrates
- Does not require consumables like ink
- Low waste
- More durable than ink marking
What is Laser Engraving?
Laser engraving is a laser-based non-contact marking method that uses a focused laser beam to vaporize or burn away the surface of a material, which effectively removes material from the surface, leaving an engraved mark. The process is very fast, very accurate, and does not require consumables like ink. It is also compatible with a wide range of materials.
Because laser engraving creates deep, tactile marks rather than a surface-level marking, it offers unmatched durability. Since engraving removes material to create a recessed cavity, light surface wear to an engraved part will not remove the visibility of the mark, making the process suitable for parts exposed to harsh environments or friction.
Common laser engraving applications include industrial marking and tracking—particularly for the kind of parts described above—as well as signage and decorative or personalized consumer goods.
Laser Engraving Benefits:
- Fast
- Very accurate
- High level of industrial durability, even compared to other laser methods
- Suitable for parts exposed to harsh environments or friction
- Wide material versatility
- Does not require consumables like ink
- Low waste despite material removal
What is Laser Etching?
The laser etching process is a non-contact, high-speed marking method that uses a laser beam to melt the surface of a material, creating a visible mark with shallow penetration into the material. Because melting causes material expansion, the mark may be raised slightly above the material surface.
Laser etching creates a clearer mark than laser engraving, though it is less durable as it does not create a deep crevice.
Counterintuitively, micro laser etching can occasionally pose a greater risk to the structure of the part than laser engraving. A good alternative technique is the “coat and mark” form of laser etching, which involves applying a coating to the surface of the base material (via electroplating, for example) then laser etching into that coating but not into the base material.
Laser Etching Benefits:
- Fast
- Can be used on thinner substrates than laser engraving
- “Coat and mark” does not affect geometry of base material
- Suitable for fairly thin substrates
- Does not require consumables like ink
- Low waste
Key Differences: Laser Marking vs Engraving vs Etching
The table below highlights the key differences between one of the most common surface-level laser marking processes (laser coloration), laser engraving, and laser etching.
| Aspect | Laser marking (coloration) | Laser engraving | Laser etching |
| Description | Laser heats the surface to cause oxidation or chemical change, producing a color change without removing material | Laser selectively vaporizes channels of material, removing it to create a recessed cavity | Laser melts the surface layer, which re-solidifies to form a shallow or slightly raised mark |
| Typical laser type | Fiber (metals), UV, or green lasers for some plastics | CO₂ lasers (wood, acrylic) or fiber lasers (metals) | Fiber lasers (metals), sometimes CO₂ for coated materials |
| Suitable materials | Metals (especially stainless steel and titanium), some plastics | Metals, wood, plastics, glass, stone, leather | Metals, plated metals, ceramics, some plastics |
| Mark depth | 0 mm (surface-only process), making it suitable for ultra-thin substrates | 0.1–0.5 mm practical engraving depth | 0.02–0.08 mm typical penetration, making it suitable for thin substrates |
| Mark visibility | Moderate–high contrast and color change | Moderate contrast but strongly tactile due to depth | High contrast, often grey or black with slight texture |
| Mark durability | Moderate but can fade with abrasion | Very high as recessed marks resist wear | Moderate as shallow or raised marks can wear over time |
| Main benefit | No material removal and clean marks ideal for traceability | Deep, permanent marks for harsh environments | Fast, high-contrast marks with minimal material removal |
Laser Marking, Engraving, and Etching: Material Specifics
Laser marking, engraving, and etching can all be used on a range of materials, making them valuable industrial techniques using modern laser technology.
Metals are the easiest material group to mark with a laser. Laser marking processes like laser coloration, laser annealing, and carbon migration are all options for adding barcodes, tags, and other markings to metal surfaces. Laser engraving and laser etching are also highly effective. Where a deeper mark is required, engraving removes material from the metal surface to ensure the code survives secondary treatments.
For plastics, laser engraving is a reliable option, while laser etching is suited to some polymers, as are processes like laser foaming and laser coloration.
- Aluminum: Laser marking aluminum generally requires either laser engraving or laser etching. Anodized aluminum produces the highest contrast markings.
- Carbon and stainless steel alloys: Laser coloring or laser annealing stainless steel are good options for zero-penetration markings. Other methods like engraving and etching are also feasible.
- Titanium: Laser marking titanium and its alloys typically requires laser annealing, engraving, or etching, though it can be challenging to achieve a black mark.
- Metal plating: Laser engraving and etching can both be used to make a mark in a thin surface coating, leaving the base material intact.
- Plastics: Laser marking techniques like laser foaming and laser coloration are good options for laser marking polymers. Plastic laser coloration allows for the creation of various shades and colors by varying laser pulse width and frequency.
- Other: Laser engraving is a more versatile technique than the others discussed, as it can be applied to substrates like wood, stone, and leather.
Laser Marking Equipment
Laser marking, engraving, and etching equipment includes fiber lasers for high-contrast metal marking and engraving, and CO₂ lasers for non-metal materials like wood and plastic. These systems can range from industrial workstations to portable units.
| Laser type | UV laser | Green laser | Fiber laser | CO₂ laser |
| Material | Ideal for delicate materials such as certain plastics and glass | Ideal for reflective or transparent materials like copper, silver, gold, and soft plastics | Ideal for metals (aluminum, stainless steel, etc.) and hard plastics | Ideal for some plastics, as well as wood, glass, acrylic, paper, and textiles |
| Wavelength | 355 nm | 532 nm | 1064 nm | 10600 nm |
Each material used in manufacturing—metal, plastic, or other—has a specific absorption spectrum. A laser that works well on one material may be completely useless on another. For example, a CO₂ laser’s long 10,600 nm wavelength passes directly through copper without marking it, while a 1064 nm fiber laser is absorbed, enabling high-quality marking. Short-wavelength lasers like UV lasers mark using a cold marking process.
Integration with Sheet Metal Fabrication
Laser marking, engraving, and etching are important post-processing techniques for many manufacturing processes. However, we find they are especially valuable in laser cutting and sheet metal fabrication, where substrates can be thin and delicate and where rapid part marking is essential for high-volume production.
The laser-based processes discussed in this article can be used on most sheet metal parts for the application of markings like serial numbers, part IDs, barcodes, QR codes, logos, and inspection marks. In many industries—including aerospace, automotive industry, and electronics—laser marking also helps with regulatory compliance, ensuring each component can be identified and tracked.
In 3ERP’s sheet metal manufacturing workflow, laser marking typically takes place after the cutting, forming, and surface finishing operations that give the components their final shape and texture. Parts are then placed in or under the laser marking machine, where a CAD-generated marking program runs to apply the identification. This fast process can be deployed at scale.
Laser Marking with 3ERP
When it comes to applying part IDs, codes, and other markings to sheet metal and other components, 3ERP provides an end-to-end solution, covering the steps from design verification to manufacturing to post-processing. We don’t just cut your parts; we provide the permanent identification required for your supply chain.
Our text, logo, and ID application goes beyond laser processes, too. We can also carry out low-cost processes like silk screening, pad printing, and rub-on application, depending on your parts, materials, and requirements.
For all your laser-marked parts and prototypes, request a quote from 3ERP.
FAQ Section
What is the best form of laser marking for traceability?
All of the forms of laser marking discussed in this article are suitable for part identification. Laser engraving provides the most durable markings, as they are deeply embedded and do not easily wear off. But laser coloration and etching can provide clearer markings that may be easier for machines to read.
Is laser engraving a type of laser marking?
Laser engraving (and laser etching) may be considered types of laser marking. For the purposes of this article, we used “laser marking” to mean non-destructive methods of laser marking that do not affect surface geometry.
Is laser engraving suitable for thin components?
The depth of laser engraved text and markings is usually in the 0.1–0.5 mm range. This makes the process unsuitable for substrates thinner than about 2.5 mm, as the process can weaken the components.
Do laser markings come off?
Most laser marking processes provide fairly durable markings, especially compared to ink-based ones. However, surface wear can reduce the visibility of markings. For parts deployed in harsh environments or subject to friction, the deep laser engraving process is best, as its recessed markings do not easily wear off.
Is laser marking sheet metal possible?
Absolutely. A variety of laser marking processes are used in sheet metal fabrication, though the best process depends on the gauge and material. Ultra-thin parts are better suited to non-destructive laser marking processes like coloration, whereas aluminum sheet metal responds best to processes like engraving and etching.
Which to choose: laser marking vs etching for stainless steel?
Laser marking, specifically the process of laser annealing, is well suited to high-contrast, black, and permanent marks on stainless steel. The process offers high precision and no surface damage.
Why use laser marking over ink-based processes?
Laser marking, engraving, and etching provide permanent, high-contrast, and maintenance-free marking without consumables. The technologies can also provide high resolution, even on complex or uneven surfaces.
