Gas pressure and nozzle type used in oxygen cutting are two fundamental parameters that directly determine outcomes ranging from cutting speed to edge quality. In this article, we look at how to select the right gas pressure and nozzle, and how this choice affects the cutting result.
The Role of Gas Pressure in the Cutting Process
In oxygen cutting, high-pressure oxygen flow is used both to support the steel's combustion reaction and to remove molten material from the cut line. Pressure not being appropriate for material thickness directly affects both cut quality and speed.
Effects of Low Pressure
Insufficient pressure prevents molten material from being fully removed from the cut line, causing dross buildup on the bottom edge. Cutting speed also drops, since the oxygen flow needed for the reaction becomes insufficient.
Effects of High Pressure
Excessive pressure can cause the kerf to widen more than needed and increase edge roughness. It also increases operating cost through unnecessary gas consumption.
The Importance of Nozzle Selection
The nozzle is a critical component that determines the shape and intensity of oxygen flow. Different nozzle types are optimized for different thickness ranges and cutting speeds.
Nozzle Diameter and Thickness Relationship
On thin material, smaller-diameter nozzles provide a precise, narrow kerf, while on thick material, larger-diameter nozzles ensure sufficient oxygen flow, allowing the cut to reach full depth.
The Effect of Nozzle Wear
A worn nozzle causes irregular gas flow, degrading cut quality. Nozzle wear typically shows up as inconsistent kerf width and increased dross formation.
Nozzle Material and Lifespan
Quality nozzle materials are more resistant to high temperatures and abrasive conditions, resulting in longer service life and more consistent cutting results.
Optimizing the Gas Pressure and Nozzle Combination
For the right result, gas pressure and nozzle selection need to be optimized together. As a general rule, the pressure ranges recommended by the nozzle manufacturer should be used as a starting point, then fine-tuned with material-specific test cuts.
General Approach by Material Thickness
- Thin material (10-20 mm): small-to-medium diameter nozzle, medium pressure
- Medium thickness (20-50 mm): medium diameter nozzle, pressure increasing with thickness
- Thick material (50 mm and above): large diameter nozzle, high pressure combined with low speed
These values are general reference points; exact settings should be determined according to the machine and nozzle manufacturer's technical data.
DMK Makina's Gas Pressure and Nozzle Management
With experience accumulated across different material thicknesses, DMK Makina determines the optimal gas pressure and nozzle combination for each project. Regular nozzle inspection and replacement ensure consistent cut quality and efficient gas usage.
Serving industrial businesses across the Thrace and Marmara regions, DMK Makina delivers optimized parameters for thick steel plate cutting, evaluating each project's thickness requirements together with its technical team.