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Arc plasma torch

Arc plasma torch

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  • Time of issue:2021-05-18 13:25
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(Summary description)Arc plasma generator is also called arc plasma torch, or plasma spray gun, sometimes also called arc heater. It is a discharge device that can generate directional "low temperature" (about 2000 to 20000 K) plasma jet.

Arc plasma torch

(Summary description)Arc plasma generator is also called arc plasma torch, or plasma spray gun, sometimes also called arc heater. It is a discharge device that can generate directional "low temperature" (about 2000 to 20000 K) plasma jet.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2021-05-18 13:25
  • Views:0
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Arc plasma generator is also called arc plasma torch, or plasma spray gun, sometimes also called arc heater. It is a discharge device that can generate a directional "low temperature" (about 2000 to 20000 Kelvin) plasma jet.

Plasma torches can be divided into non-transferred arc torches and transferred arc torches according to the form of arc plasma. In non-transferred arc torches, the anode doubles as the nozzle of the torch; and in the transferred arc torch, the anode refers to the process to which the arc leaves the torch and transfers to it. Artifact. Of course, there are also combined plasma torches that have both transferred arc and non-transferred arc.

Arc plasma is widely used in cutting, welding, spraying, metallurgy, materials, chemical and waste treatment industries. Numerical simulation of arc thermal plasma helps to better understand the physical process of thermal plasma and optimize the design of plasma generator.

Three conclusions can be drawn through experiments:

(1) When studying the swirling airflow, it is found that increasing the degree of swirl will increase the pressure in the arc chamber and change the pressure distribution in the arc chamber, thereby shrinking the arc. The cyclone has little effect on the temperature of the nozzle orifice of the cutting torch and the temperature of the jet area, but it will make the plasma outside the nozzle get a higher speed and a stronger shock wave. The cyclone will accelerate the burning loss of the cathode by changing the direction of airflow near the cathode and increasing the pressure near the cathode. (2) In the parameter study, it is found that the increase in the length of the nozzle orifice of the cutting torch will increase the maximum jet velocity, increase the arc chamber pressure, and increase the radius of the high-speed jet area after the shock. Reducing the radius of the nozzle hole will increase the pressure of the arc chamber and increase the intensity of the shock wave. The maximum value of the radial distribution of the velocity and energy flow density after the shock wave will deviate from the axis. This will facilitate the exchange of energy and momentum between the arc and the cutting workpiece, thereby increasing the cutting speed. The gas flow will affect the velocity and temperature distribution of the plasma. The strong gas flow will shrink the arc due to the strong cooling effect, increase the arc voltage and power, and increase the velocity, temperature and energy flux of the jet. The arc current has a very important effect on the velocity field and temperature field of the plasma. The energy flow density in the plasma jet is almost proportional to the arc current. (3) By comparing the plasma flow field generated by the cutting torch with two different structures, it is found that the shielding gas has little effect on the temperature and velocity distribution of the plasma. The vertical shielding gas forms an obstructive effect on the nozzle of the cutting torch, causing the pressure in the cutting torch to increase, but the change is not significant. The influence of the protective gas of the two structures on the cutting arc is only near the shock wave outside the torch nozzle. After adding protective gas, the intensity of the shock wave will be weakened. Compared with the situation without the protective gas, the protective gas increases the cooling effect, and the arc voltage will increase slightly. When the composition of the shielding gas is changed, it is found that the oxygen content in the arc column area is not affected, so the change of the shielding gas composition will not affect the arc voltage. The calculation found that the mixing of oxygen and surrounding gas at the axis is very little, and the mole fraction of oxygen at 10mm downstream of the nozzle is still above 90%.

This article introduces the basic definition of arc plasma torch and some conclusions drawn through experiments.

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