The process parameters of gas cutting are mainly determined based on the cutting speed.

It is wrong to determine the process parameters of gas cutting mainly based on cutting speed.

The gas cutting process parameters mainly include the cutting torch model and cutting oxygen pressure, gas cutting speed, preheating flame energy rate, the inclination angle between the cutting nozzle and the workpiece, the distance between the cutting nozzle and the workpiece surface, etc.

(1) Cutting torch model and cutting oxygen pressure. The thicker the cut piece, the cutting torch model, cutting nozzle number, and oxygen pressure should all increase. The oxygen pressure is related to the thickness of the cut piece, the cutting torch model, and the cutting pressure. The relationship between mouth numbers is detailed in Table 2-10. When the cut piece is thin, the cutting oxygen pressure can be appropriately reduced. However, the cutting oxygen pressure cannot be too low or too high.

(2) Gas cutting speed Generally, gas cutting speed is related to the thickness of the workpiece and the shape of the cutting nozzle. The thicker the workpiece, the slower the gas cutting speed. On the contrary, the gas cutting speed should be faster. The gas cutting speed is controlled by the operator according to the amount of backdraft of the cutting seam. The so-called drag amount refers to the distance in the horizontal direction between the starting point and the end point of the cutting oxygen flow trajectory on the cutting surface during the oxygen cutting process.

(3) Preheating flame energy rate The function of the preheating flame is to heat the metal workpiece to the temperature at which the metal burns in oxygen, and to always maintain this temperature while also using The oxide scale on the steel surface is peeled off and melted, allowing the cutting oxygen flow to contact the metal.

(4) The inclination angle between the cutting nozzle and the workpiece. The inclination angle of the cutting nozzle is mainly determined according to the thickness of the workpiece. Generally, when gas cutting a steel plate with a thickness of less than 4mm, the cutting nozzle should be tilted back 25°-45°; when cutting a steel plate 4-20mm thick, the cutting nozzle should be tilted back 20°-30°; when cutting a steel plate 20-30mm thick, the cutting nozzle should be tilted back 20°-30°. The nozzle should be perpendicular to the workpiece; when gas cutting a steel plate thicker than 30mm, the cutting nozzle should be tilted forward 20°-30° when starting gas cutting. After cutting through, the cutting nozzle should be perpendicular to the workpiece for normal cutting. The cutting nozzle should gradually move backward. Tilt 20°-30°.

(5) The distance between the cutting nozzle and the surface of the workpiece. Usually the distance between the flame core and the surface of the workpiece should be kept within the range of 3-5mm. In this way, the heating conditions are the best. And the possibility of carburization is also minimal. If the flame core touches the surface of the workpiece, it will not only cause the upper edge of the slit to melt, but also increase the possibility of carburization of the slit.