Plasma Torch Nozzles Hafnium Wire

Plasma arc cutting is a processing method that uses the heat of a high-temperature plasma arc to locally melt (and evaporate) the metal at the incision of the workpiece, and uses the momentum of high-speed plasma to remove the molten metal to form an incision.
Plasma cutting with different working gases can cut various metals that are difficult to cut by oxygen cutting, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel), the cutting effect is better; its main advantage is that the cutting thickness of metals is not large. At times, the plasma cutting speed is fast, especially when cutting ordinary carbon steel sheets, the speed can reach 5~6 times that of the oxygen cutting method, the cutting surface is smooth, the thermal deformation is small, and the heat affected zone is less. Plasma cutting machines are widely used in automobiles, locomotives, pressure vessels, chemical machinery, nuclear industry, general machinery, construction machinery, steel structures, ships and other industries.
 

The company's series of plasma cutting power supply is equipped with a power supply voltage compensation device, which can continue to work when the power supply voltage changes within the range of ±10% of the rated voltage.
When using longer cables, in order to reduce the voltage drop, it is recommended to use cables with larger cross-sections; if the connecting cables are too long, it may have a great impact on the arc-starting performance of the cutting machine and other performances of the system. So we recommend that you use the recommended configuration length.
 

Process parameters directly affect the stability, cutting quality and effect of the cutting process. The main cutting specifications are briefly described as follows:

No-load voltage and arc column voltage
The plasma cutting power supply must have a high enough no-load voltage to easily start the arc and make the plasma arc burn stably. Increasing the arc column voltage can significantly increase the power of the plasma arc, thereby increasing the cutting speed and cutting metal sheets with larger thicknesses. The arc column voltage is often achieved by adjusting the gas flow and increasing the retraction of the electrode, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.
Cutting current
Increasing the cutting current can also increase the power of the plasma arc, but it is limited by the maximum allowable current, otherwise the plasma arc column will become thicker, the slit width will increase, and the electrode life will decrease.
Gas flow
Increasing the gas flow can not only increase the arc column voltage, but also enhance the compression effect on the arc column, so that the plasma arc energy is more concentrated and the jetting force is stronger, so the cutting speed and quality can be improved. However, if the gas flow is too large, the arc column will be shortened, the heat loss will increase, and the cutting ability will be weakened until the cutting process cannot be carried out normally. Therefore, it is recommended that the air pressure is between 0.4-0.55MPA, and the gas flow rate is 200L per minute.
The amount of electrode retraction
The so-called retraction refers to the distance from the electrode to the end face of the cutting nozzle. A suitable distance can make the arc well compressed in the cutting nozzle and obtain a plasma arc with concentrated energy and high temperature for effective cutting. If the distance is too large or too small, the electrode will be seriously burned, the cutting tip will be burned out and the cutting ability will be reduced. The amount of shrinkage is generally 8-11mm.
Nozzle height
The height of the cutting tip refers to the distance from the end face of the cutting tip to the surface of the workpiece being cut. The distance is generally 4~10mm. It is the same as the retraction of the electrode, and the distance must be appropriate to give full play to the cutting efficiency of the plasma arc, otherwise the cutting efficiency and cutting quality will be reduced or the cutting nozzle will be burned out.
Cutting speed
The above factors directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the plasma arc, and the high temperature and high energy of the plasma arc determine the cutting speed, so the above factors are related to the cutting speed. On the premise of ensuring the cutting quality, the cutting speed should be increased as much as possible. This not only increases productivity, but also reduces the amount of deformation of the part being cut and the heat-affected zone in the kerf area. If the cutting speed is not suitable, the effect will be opposite, and it will increase the slag and reduce the cutting quality.