Plasma working gas and flow
Work of gas mainly includes a cutting gas and auxiliary gas, some enterprise equipment also requires arc gas, usually we have to cut the type of technical material, thickness and cutting methods to study the selection of their own suitable working environment gas. Cutting gas can not only ensure the formation of plasma jet, but also fully ensure that the cutting point can be removed from the molten metal and oxides. Excessive gas mass flow will take away more of their arc heat, so that the length of the jet becomes shorter, resulting in a continuous decline in cutting management capacity and instability of the arc;
Now the plasma arc cutting machine mostly rely on gas protection pressure to control the flow, because when the gun body aperture is certain, the control of gas pressure problem is difficult to control the flow. The change in gas pressure used in cutting a certain sheet thickness material is usually selected according to the data information provided by the equipment manufacturer, and if there are other special applications, the gas pressure is also required to be determined by the student simply through the actual cutting test in China. Commonly used target gases are: argon, nitrogen, oxygen, air and H35, argon-nitrogen mixture sesame gas.
1. Radon is difficult to react with any metal at high temperatures, and the plasma arc is stable. The nozzles and electrodes used have a long service life. Instead, the voltage of the gamma plasma arc is reduced, and the high crucible is cut with an unlimited cutting capacity, compared with the air with its cutting thickness reduced to about 25%. In addition, in an environment of argon atmosphere, the surface tension of the molten metal is higher than in the nitrogen atmosphere to about 30%, so there will be more problems. Even a mixture of argon and other gases will have a tendency to cut viscous residues. As a result, it is now rare to use a separate pure argon plasma cutting.
2. Hydrogen is usually an auxiliary enterprise to carry out gas mixing with some other gases, such as the famous gas H35 (hydrogen volume mass fraction of 35%, the rest is argon) is one of the strong development of plasma arc cutting technology technology. Because the hydrogen energy can be significantly increased level and arc voltage, hydrogen plasma jet has a high radon value, when mixed with argon, its plasma jet cutting ability can be greatly improved. Generally for the thickness of more than 70mm of metal structure materials, commonly used as a cutting gas. If the compression is further studied by using water jet to further study the hydrogen plasma arc, it can also obtain a higher cutting management efficiency at the same time.
3.Nitrogen is a commonly used working gas, under the condition of high power supply voltage, nitrogen plasma arc has better stability and higher jet energy than argon. Even in cutting materials with high viscosity of liquid metals such as stainless steel and nickel-based alloys, the amount of slag on the lower edge of the gap is small. Nitrogen can be used alone or mixed with other gases, such as nitrogen or air, which is often used as a working gas during automatic cutting, which has become the standard gas for high-speed cutting of carbon steel. In the process of oxygen plasma arc cutting, nitrogen is sometimes used as arc starting gas.
4. can improve the cutting oxygen low-carbon steel material speed. When using oxygen cutting, cutting mode and flame cutting is to imagine high temperature high-energy plasma arcs to make cutting faster, but must be used in conjunction with high temperature oxidation of the electrode, which is anti-shock arc protection extends the life of the electrode.
5. he air contains about 78% of the volume of nitrogen, so we use air through cutting formed by the hanging slag situation and with nitrogen cutting is very similar; However, when studying air cutting in the process of use alone, there will be problems such as slag and cut oxidation and nitrogen increases, and with the relatively low life of electrodes and nozzles, it will also affect the efficiency of work learning and cutting technology costs.
Hubei Meisar CNC Technology Co. , Ltd. is a professional production CNC flame cutting machine, CNC plasma cutting machine, CNC multi-head straight cutting machine, CNC flame plasma two-use cutting machine, gantry CNC cutting machine, Gantry CNC flame cutting machine, gantry cnc plasma cutting machine, line cutting machine, pipe CNC cutting machine, bevel cutting machine, square pipe cutting machine, shaped pipe cutting machine, portable CNC cutting machine, small bee plasma cutting machine, wind pipe plasma cutting machine, Industrial tabletop CNC cutting machine, laser cutting machine, laser tube cutting machine, laser square tube cutting machine, laser tube cutting machine and so on.
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