Oxy fuel cutting

Oxy fuel cutting: what is it about?

Oxy-fuel cutting is a process that, by exploiting the presence of carbon in the metal and by administering heat and oxygen to the sheet, is able to cut even very high thicknesses.

A fundamental part is a torch into which various gases are canalized, which are emitted at the right pressure and concentration. Their action, combined with the correct relative distances between the torch and the metal, allows the cutting of the sheet.

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Oxy fuel cutting: this is how it works

In the first phase, through an oxyacetylene flame called a heating flame, the metal is heated bringing it to incandescence. Subsequently, a high-pressure jet of oxygen completes the breakthrough of the material along with its entire thickness. Once the material has been broken through, the torch is moved to progressively cut the sheet.

Carbon triggers an exothermic action when it comes into contact with oxygen in a high-temperature environment. This generates an increase in heat, the oxidation of the metal, and consequently the cutting of the sheet.

The advantages of oxy fuel cutting


With oxy fuel cutting, it is possible to cut very high thicknesses that laser and plasma technologies cannot achieve. Conversely, only carbon-containing steel can be cut.

Oxy fuel cutting for thicknesses above 50 mm is a valid alternative to plasma cutting.

It is possible to use this technology both manually and in an automated manner, by applying the torch to a machine controlled by numerical control.

Processing costs are low when compared with other thermal cutting technologies.

By oxy fuel cutting, surfaces are ready for any subsequent welding phases.

The applications of oxy fuel cutting

Oxy fuel, manually, is used in the demolition and recycling of heavy steel components.

For example, it can be used in the naval, civil, construction, and mechanical sectors.

An oxy-fuel torch in an industrial environment is associated with a bench equipped with a portal and numerical control. Thanks to optimized nesting it is possible to reduce waste to a minimum and increase the productivity of the technology.

More than one torch is available on some machines, allowing the cutting of very large sheets in shorter times.

It is possible to cut metals containing 0.12 to 0.25% carbon. Among them the best known are:

General construction steel
Mild steel
Molybdenum or chromium molybdenum steel
Abrasion resistant cor-ten and creusabro steel

Oxyfuel: the use of gases

To make a cut, an oxidizing gas and a combustible gas are required.
Oxygen is used as the combustion gas. Oxygen is used as the oxidizing gas.
Acetylene is widely used as a fuel gas because, given the lower high calorific value, it provides a lot of heat to the sheet metal. Alternatives to acetylene can be methane or propane.

During the heating phase, a small amount of oxygen is used to help the heating. During the cutting phase it is the oxygen that is the protagonist performing the oxidation and cutting of the sheet.

The balance between gas, distance from the sheet and movement speed is essential for the execution of a good cut.
On the other hand, the action of oxygen generates an oxidation of the cut surface.

Promotec oxy-fuel machines

Promotec offers a range of oxy-cutting machines capable of satisfying multiple customer needs.

We have designed a portal with an optimal mass/stiffness ratio, reducing material waste and gaining performance such as speed and acceleration, which are important in rapid movements.

High reliability, precision, lightness, and performance accompanied by tailor-made solutions make Promotec the ideal partner for your company.
Oxy-cutting machines or combined machines are available.

The combined can offer, in addition to the oxy-fuel head:

a drilling module
a plasma cutting head
a laser cutting head

Our machines


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