FLAME CUTTING.

Oxy acetylene cutting is known by many names, such as oxy cutting, oxy-fuel cutting or flame cutting. It is a process where fuel gases and pure oxygen are used for cutting.

Flame cutting uses pre-heating. First, the flame heats up a spot on the metal. Then a high-pressure stream of pure oxygen is directed towards this spot. Hitting the heated spot ignites the oxygen which, in turn, cuts the metal. The cutting flame temperatures rise up to 3500°C.

The cutting torch usually has a central hole and some more placed around it. The holes around the central jet are for guiding oxygen and acetylene onto the workpiece to preheat it. The central jet is for oxygen only – it provides the final cutting gas.

Flame cutting is excellent for cutting steel. The reason why it only works well with steel is related to the chemical reactions taking place. When the metal melts, it combines with oxide to form iron oxide. This makes the cut possible.

Therefore, it is a good option when working with ferrous metals but is pretty much unusable with aluminium or even stainless steel. Aluminium oxide has a higher melting temperature than iron oxide. This is why it is not usable there. Stainless steel, on the other hand, is actually used for those non-oxidising qualities, making these metals also unsuitable.

For these reasons, it is necessary to find an alternative when thick plates from materials other than carbon steel need cutting. One possibility is waterjet cutting.

Grupo Doco’s manufacturing partners use CNC machines which have flame cutting torches. Using gas cutting technology we can cut steel plates with a thickness of 10…150 mm. All oxy-fuel cutting is in accordance with quality classification EN ISO 9013.

Although it is usually advisable to turn to plasma cutting when facing thick materials, flame cutting services are essential for thicknesses over 50 mm. It is important to note that oxy-fuel cutting involves the oxidisation process. Therefore, it limits the possibilities of the method to ferrous metals only.

• Cuts thick materials – This is by far the biggest advantage of using a flame cutting service. It enables the cutting of steel plates up to a thickness of 150 mm.
• Portability – It does not require primary power, nor compressed air. Therefore, it is easily portable. The 15 kg set lets you cut metal pretty much anywhere, making it a solution for on-site welding and cutting jobs.
• Cutting speed – One of the advantages of the oxy acetylene cutting service is its quickness. It’s especially evident for steel plates with a thickness of over 30 mm. Although plasma cutting is also considered a speedy option, oxy cutting edges it with bigger thicknesses and the gap widens further with the increase of dimensions.
• Variety of operations – Oxy-fuel torches are not suitable only for a cutting process. Some of the other executable operations include welding of ferrous metals, heat treating, heat shaping, riser cutting and brazing.