A good plasma cutter needs a good and suitable power supply for the high-quality product cutting. What scientific basis does our company choose to use in power supply production? The following are some of our reference, I hope to have some good guidance and help for enterprises and manufacturers. Paraffin Wax,Refined Paraffin Wax,Semi Refined Paraffin Wax,Pure Paraffin Wax JAR HING PRODUCTS.,LTD , https://www.jarhingproducts.com
It is generally considered that the normal output voltage of the power supply is the cutting voltage. CNC plasma cutting machines usually have high no-load voltages and operating voltages. When using gases with high ionization energy such as nitrogen, hydrogen, or air, the voltage required to stabilize the plasma arc will be higher. When the current is constant, the increase of the voltage means that the arc ç„“ value increases and the cutting ability increases. If the diameter of the jet is decreased and the flow rate of the gas is increased while the enthalpy is increased, a faster cutting speed and a better cutting quality can be obtained.
1. Oxygen can increase the speed of cutting low-carbon steel materials. When using oxygen for cutting, the cutting mode and flame cutting are imaginable. The high temperature and high energy plasma arc makes the cutting speed faster, but it must be used in conjunction with an electrode that resists high temperature oxidation, and at the same time, the electrode is protected against impact by arcing to extend the electrode. Life expectancy.
2. Hydrogen is usually used as an auxiliary gas to mix with other gases. For example, the famous gas H35 (having a volume fraction of hydrogen of 35% and the rest being argon) is one of the gases with the strongest plasma arc cutting ability. hydrogen. Since hydrogen can significantly increase the arc voltage, the hydrogen plasma jet has a high enthalpy. When used in combination with argon, the cutting ability of the plasma jet is greatly improved. Generally, argon is used as a cutting gas for metal materials having a thickness of 70 mm or more. If using water jets for argon +
Hydrogen plasma arcs are further compressed and higher cutting efficiency can also be achieved.
3, the air contains about 78% of the nitrogen content, so the use of air cutting slag formation and cutting with nitrogen is very imaginable; the air also contains about 21% by volume of oxygen, because of the presence of oxygen, with air The speed of cutting low-carbon steel materials is also high; at the same time, air is the most economical working gas. However, when using air cutting alone, there are problems such as slag dregs, incision oxidation, and nitrogen addition, and the lower life of electrodes and nozzles will also affect work efficiency and cutting cost. Since plasma arc cutting generally uses a power source with constant current or steep drop characteristics, after the height of the nozzle is increased, the current change is small, but the arc length is increased and the arc voltage is increased, thereby increasing the arc power; but at the same time, The arc length exposed to the environment increases, and the energy lost from the arc column increases. In the case of a combination of two factors, the role of the former is often completely offset by the latter, but will reduce the effective cutting energy, resulting in reduced cutting ability. The general performance is that the blowing force of the cutting jet is weakened, the residual slag at the lower part of the incision is increased, and the upper edge is over-melted and rounded. In addition, from the point of view of the shape of the plasma jet, the diameter of the jet expands outward after leaving the muzzle, and the increase in the height of the nozzle inevitably results in an increase in the width of the slit. Therefore, choosing the smallest possible nozzle height is beneficial for increasing the cutting speed and cutting quality. However, if the nozzle height is too low, double arcing may occur. The nozzle height can be set to zero by using a ceramic outer nozzle, that is, the end face of the nozzle directly contacts the surface to be cut, and a good effect can be obtained.
4. Nitrogen is a commonly used working gas. Under the conditions of higher power supply voltage, the nitrogen plasma arc has better stability and higher jet energy than argon, even if the liquid metal viscosity is high In stainless steel and nickel-base alloys, the amount of dross on the lower edge of the cut is also small. Nitrogen can be used alone or mixed with other gases. For example, nitrogen or air is often used as a working gas in automated cutting. These two gases have become standard gases for high-speed cutting of carbon steel. Nitrogen is also sometimes used as starting gas for oxygen plasma arc cutting.
5. Argon gas hardly reacts with any metal at high temperatures, and the argon gas plasma cutting machine is very stable. Moreover, the nozzles and electrodes used have a long service life. However, the argon plasma arc voltage is low, the enthalpy value is not high, the cutting ability is limited, and the cut thickness is reduced by about 25% compared with air cutting. In addition, in an argon-protected environment, the surface tension of the molten metal is relatively large, about 30% higher than that in the nitrogen atmosphere, and therefore, there are many problems with dross. Even when using a mixture of argon and other gases, there is a tendency for sticky slag. Therefore, there are very few pure argon plasmas used for plasma cutting. I often come to my website to learn about the production and use of CNC cutting machines. We will provide you with industry news and trends in real time and choose the right one for the production companies. Good machines provide guidance. More attention, wonderful constantly updated.
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