Oxyfuel Cutting : MOST ECONOMICAL PROCESS

CNC Oxyfuel Cutting Machine

Oxyfuel flame cutting is the most economical process for the cutting of mild and low alloy steels, even with weld preparations. It is one of the most important production processes in the metal industry.

CNC Oxy fuel cutting is a combustion process using oxygen/fuel gas flame. The heating flame brings the material up to its ignition temperature. Then a jet of Oxygen at least 99,5 % pure is blown onto the heated spot. The Oxygen jet oxidizes the metal. The torch is moved and a narrow cutting kerf is created, removing the slag from the kerf. The quality of the cut depends on the surface condition of the material, cut-velocity and thickness.

All low alloy steel with a material thickness up to several decimeters can be cut with this process. Despite the increasing significance of the other cutting processes such as plasma and laser cutting, oxy fuel flame cutting is still a very economical process. For heavy material thicknesses up to 35 inch (900mm) there is no alternative to flame cutting.

Machine flame cutting ensures reliable hole-piercing, high cutting speeds and allows the production of components to their finished sizes without the need for further processing. For weld seam preparations V, Y and K cuts can be produced.

CHARACTERISTICS:

Plate thickness: 3 mm up to 900 mm
Typical: 10 mm up to 300 mm

KEY FEATURES:

  • Good cut quality
  • Smooth, vertical planes of cut
  • Metallurgical perfect surfaces (oxidized)
  • Carbonizing and hardening within the area of the heat affected zone
  • High heat input
  • Limited range of material
  • Low cutting speed

Characteristics of oxy-fuel compared to plasma

Material
Oxy-fuel cutting is used for the cutting of mild steel. Only metals whose oxides have a lower melting point than the base metal itself can be cut with this process. Otherwise as soon as the metal oxidises it terminates the oxidation by forming a protective crust. Only mild steel and some low alloys meet the above conditions.

Wall thickness
Oxy-fuel allows the cutting of thicker walled material then plasma. Plasma can’t cut thicker walls because of the huge amounts of energy necessary to reach similar thicknesses.

Cutting angle
Oxy-fuel allows cutting of steeper angles up to 70° (as compared to 45° with plasma) because of the concentration of the oxygen beam.

Straight cuts
The plasma beam has the tendency to deflect when the angle is too steep. However, this deflection could be compensated by automation.

Costs
Oxy-fuel is a more economical solution than plasma cutting. Initial investment costs, consumables and operating costs are all lower than plasma cutting. However, processing speeds are typically lower below a 20 mm wall thickness range (considering 3D profiling in the heavy steel industry).