Sheet metal laser cutting

Sheet metal laser cutting

A laser-cut is performed by directing an intensely focused beam of photons onto the underlying surface.
The different waves are all directed to the same point through a system of lenses, thus coordinating their direction.

The laser beam is emitted by a source, deflected by a series of lenses until it reaches the nozzle.
The laser cutting produced in this way is extremely concentrated. Therefore, it has a very high energy density.

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Sheet metal laser cutting: this is how it works

The laser cutting, moving to the underlying surface at a certain height and speed, allows to obtain a sheet cut just wider than the beam. This feature allows to minimize waste material and optimize nesting.

When the underlying material receives more heat than it can dispose of (by thermal conduction to the surrounding material) it reaches the point of melting or vaporization and the ray penetrates the material.

After the beam breaks through the material for its entire thickness, the cutting phase begins.

In this phase, the cutting laser will travel along the contours of the object and will produce detachment from the sheet.

There is a technical gas that, thanks to the pressure with which it comes out of a nozzle placed near the laser beam, separates the molten material and guarantees a clean-cut, of high quality and precision.

The advantages of sheet metal laser cutting

The advantages of a laser-cut are many


Laser cutting is highly versatile: it allows to work on surfaces of various materials and is therefore available in various sizes and powers


The cutting speeds are very high. Furthermore, the precision and quality of the cut is excellent


Ready-to-use objects can be produced that do not require subsequent processing. Or semi-finished products intended for bending and/or welding

Laser beam diameter

The kerf is slightly greater than the diameter of the laser beam

Resistance to wear

There are no tools subject to wear as the cut takes place without contact. Simply replace the consumables in a simple way and in a few seconds.

In the laser engraving machines produced by Promotec you will find the right combination of speed, efficiency, productivity, and precision.

The reduced masses of the portal and the cutting head allow rapid and precise movements which, together with high-performance laser sources, allow to obtain a clean and accurate cut in accordance with the needs of each customer.

In this regard, a new portal was designed by Promotec in order to obtain an optimal ratio between mass and stiffness, which are essential for the kinematics of the system, and Promotec the execution of a good cut.

The applications of sheet metal laser cutting

Through this technology, it is possible to perform cutting, marking, engraving, and heating of the desired product.

Thanks to its properties it is possible to work on the following materials:

Conductive metals
Non-conductive metals
Plastic materials
Wood and cork
Glass and ceramics
Paper and cardboard
Leather and fabrics

Promotec specializes in metal cutting. With our equipment we are able to cut metals such as carbon steel, stainless steel, aluminium, copper, brass. It is possible to mount fiber lasers with powers up to 25 kw capable of cutting thicknesses up to 30 mm.

The types of laser cutting

The types of laser cutting sources are as follows:


Promotec usually installs fiber laser sources as they are more performing than a co2 system.
This is because the laser spot is smaller, so the cut is more precise and stable.
Furthermore, the electricity consumption is lower.

Compared to the laser generated by a diode source, the fiber gets into trouble on reflective materials.
However, in general its routine maintenance is more expensive due to the crystals used in the diode which must be replaced periodically.

A fiber laser is therefore an excellent compromise between return and economic investment.

Laser cutting: the use of gas

Inert gases such as argon, nitrogen, and helium or non-inert gases such as oxygen can be used.

An inert gas has no chemical affinity with the material to be melted.
Therefore, the cut product will not show oxidation compared to the initial product.

Oxygen generates more energy due to the reaction with the metal material, allowing it to work with greater thicknesses or use higher speeds.
The downside is the formation of an oxide patina on the cut surface and a less precise cut than using an inert gas.

Promotec laser cutting machines

Promotec offers a range of sheet metal laser cutting machines capable of satisfying multiple customer needs.

High reliability, precision, lightness, and performance accompanied by tailor-made solutions make Promotec the ideal partner for your company.

Laser cutting machines or combined machines are available.
Combined machines can offer, in addition to the laser cutting head, a drilling module, an oxy-fuel head, or a plasma cutting head.

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