Everyone knows that the power supply has a large impact on the cutting machine. The other factors are not mentioned for the time being. Now we are talking about the power supply of the plasma cutting machine. Medical Disposable Protective Suit The disposable medical protective gown in stock is factory directly sale with high quality and good price. Anti-Virus Protective Clothing,Medical Protective Suit,Disposable Protective Coverall,Safety Suit For Medical Use Shandong Shengquan New Materials Co., Ltd. , https://www.sqnewmaterials.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 the water jet is used to further compress the argon + hydrogen plasma arc, 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.
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, pure argon is rarely used alone for plasma cutting.
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