Large thickness plasma cutting machine processing technology

Plasma cutters pass a gas mixture through a high-frequency arc, causing some gases to “decompose” or ionize, becoming basic atomic particles, creating a “plasma”. When the arc jumps to the workpiece, the high pressure gas blows the plasma out of the torch burner at an outlet speed of 800 to 1 000 m/s (about 3 Mach). The temperature of the plasma arc column is extremely high, up to 10 000 °C to 30 000 °C, which far exceeds the melting point of all metal or non-metallic materials, so that the workpiece is rapidly melted, and the molten metal is blown away by the high-pressure gas stream that is ejected. . Therefore, it is necessary to use exhaust and deslagging equipment. Plasma cutting with different working gases can cut all kinds of oxygen cutting hard-to-cut metal, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel) cutting effect is better; its main advantage lies in the cutting of small thickness of metal materials At the same time, the plasma cutting speed is fast, especially when cutting ordinary carbon steel sheets, the speed can reach 5-6 times of oxygen cutting, the cutting surface is smooth, the thermal deformation is small, and there is almost no heat-affected zone. Plasma cutting has developed to the present time, the working gas can be used (the working gas is the plasma arc of the conductive medium, but also carrying heat, but also to exclude the molten metal in the incision) on the plasma arc cutting characteristics and cutting quality and speed have Significant influence. Common plasma arc working gases include argon, hydrogen, nitrogen, oxygen, air, water vapor, and certain mixed gases.

Process features:

1. As the cutting thickness increases, the amount of metal to be melted also increases, so the required plasma arc power is relatively large. When cutting plates with a thickness of 80 mm or more, the plasma arc power is 50 to 100 kW. In order to reduce the erosion of the nozzle and the tungsten electrode, it is preferable to increase the cutting voltage of the plasma arc at the same power. For this reason, it is required that the no-load voltage of the cutting power supply be 220 V or more.

2. The plasma arc is required to have a slender shape and good stiffness, and the arc column maintains a high temperature for a long distance. That is, the axial temperature gradient should be small and the temperature distribution on the arc column should be uniform. In this way, the bottom of the cut can get enough heat to ensure cut through. It is better to use a mixture of nitrogen and hydrogen with a larger enthalpy and higher thermal conductivity.

3. During arcing, due to large current abrupt changes, arc interruptions, nozzle burnout, etc. may occur during the arcing process. Therefore, equipment is required to use current increasing arcing or stepwise arcing. Generally, a current limiting resistor (approximately 0.4 Ω) can be placed in the cutting circuit to reduce the current value during arcing, and then the resistance is short-circuited.

4. Warm up when cutting starts. The warm-up time is determined by the properties and thickness of the material being cut. For stainless steel, when the workpiece thickness is 200 mm, it needs to be preheated for 8-20 s; when the workpiece thickness is 50 mm, it needs to be preheated for 2.5-3.5 s. After the workpiece has been cut with a large thickness, the cutting torch must be moved after cutting through the thickness of the workpiece to achieve continuous cutting. Otherwise, the workpiece will not be cut. At the end of the closing period, the arc must be completely cut off.

Jining ChangSong Construction Machinery Co.,Ltd is founded in 2000,located in jining city,Shandong province.Which is the hometown of Confucious and Mencious,the Pearl of Canal.
Based on the Supply Chain of Shantui.Komatsu Construction Machinery Manufacturer,we have advanced production equipment and Technical Staffs.Meanwhile,Welcome your OEM and ODM production requirement.

From the year of 2009.We successfully won the supplier qualification of China Petroleum Pipeline Bureau(CPP),Sinohydro Corporation Ltd,China Railway Group Ltd.(CTCE).Shantui Imp&Exp Co.,Ltd ,China Datang Corporation etc Super Large multinational enterprises.  

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