Cutting Metal Thickness over 500mm
Cutting metal with a thickness of more than 500 mm is a rather complicated technological process. There is a misconception that cutting high thicknesses is done by merely increasing the diameter of the cutting oxygen channel, adding the cutting oxygen pressure, and increasing the heating flame flow. This is not the case. Oxy-fuel cutting is the process of iron oxidation in an oxygen atmosphere, and the fuller and better this reaction goes, the faster and to a greater thickness the metal is cut. An essential requirement is the uniform heating of the metal throughout its entire thickness. This condition is hard to fulfill using an ordinary nozzle for cutting thicknesses over 300 mm.
For uniform heating of thick metal, double-flame metallurgical nozzles are used. Double-flame nozzles achieve a minimum temperature drop between the upper and lower edges of the cut metal by heating the inner surface with an internal flame.
Furthermore, the pressure of the cutting oxygen must not be raised above 4-5 Bar because a powerful jet of cold oxygen (the temperature of which, due to a sharp expansion, may even be negative) will cool the lower part of the cut surface. This would slow down iron oxidation, decreasing the cutting thickness. For example, cutting metal with a thickness of more than 1000 mm is carried out at a pressure of 2.5-3.0 Bar. In order to achieve low-pressure cutting, the cutting nozzle design is based on supersonic jet technology.
Plazmamax provides oxy-fuel and plasma-cutting equipment to produce trusses, bridges, cranes, railways, power lines, fencing lights, and wagons. Our equipment can also be used to construct oil and metallurgical plants, with the added benefit of applying high-quality protective, anti-corrosion coatings.