Commonly used plasma cutting methods and their selection (2)

The relationship between the common plate thickness and the cutting speed at different current intensities is shown in Fig. 2 and Fig. 3.

1. 3 plasma nitrogen cutting method

The plasma nitrogen cutting method uses nitrogen as a working gas and is mainly used for cutting stainless steel. Nitrogen has good heat conduction and heat transfer performance, and the arc column is also long, so it has good cutting ability. However, the surface quality of the cut is not very good, and the cut surface has nitride. The price of nitrogen is relatively low relative to oxygen, so this cutting method is generally only used for stainless steel blanks that do not require high quality cutting surfaces and are not directly used for welding.

The relationship between the common plate thickness and the cutting speed at different current intensities is shown in Fig. 4.

1. 4 plasma argon-hydrogen cutting method

The plasma argon-hydrogen cutting method uses a mixed gas of argon and hydrogen as a working gas, and is mainly used for cutting stainless steel and aluminum. Argon is easily ionized to form a stable plasma arc, and the atomic mass is large, and the momentum of the plasma stream is also large. The thermal conductivity of hydrogen is good, and the amount of heat released when the ionized particles are combined is high. The combination of the two can form a plasma arc with stable, high energy density and long arc length. The cutting ability is strong, the slit width and the cutting surface angle are small, the slit is smooth, and the nitrogen oxides generated during cutting are less, which is in plasma cutting. A method of better cutting quality. However, this cutting method uses a mixed gas as a working gas, and a mixing device is added to mix argon and hydrogen well.

Due to the high price of argon and hydrogen, and hydrogen as a dangerous gas, this cutting method is generally used to cut thick stainless steel and aluminum workpieces that are not required to be processed by other plasma cutting, and the use environment meets safety requirements. in the case of.

The relationship between the common plate thickness and the cutting speed under different current intensities is shown in Fig. 5 and Fig. 6.

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