Plasma cutting with different working gas can cut a variety of metal cutting oxygen cutting difficult, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel) Cutting better; its main advantage is that the thickness of the metal is not cut When plasma cutting speed, especially in the cutting of ordinary carbon steel sheet, speeds of up to 5-6 times the oxygen cutting method, cutting surface smooth, heat distortion is small, less heat affected zone. [1]
Plasma cutting machines are widely used in automobiles, motorcycles, pressure vessels, chemical machinery, nuclear industry, general machinery, engineering machinery, steel, shipbuilding and other industries.
2. The working gas
Plasma cutting development to the current, can be working gas (working gas is a plasma arc conductive medium, but also bring hot body, but also to exclude incision of the molten metal) characteristics of plasma arc cutting, and the cutting quality and speed have significant impact. Commonly used plasma arc working gas argon, hydrogen, nitrogen, oxygen, air, a mixed gas of water vapor and certain.
3. Air Plasma Cutting Torch Cutting method
Plasma cutting method in addition to the general form, derived in the form of water as well as compressed plasma cutting. The most common method is generally air plasma cutting and plasma cutting.
General Cutting
General Plasma cutting without shielding gas, the working gas and cutting gas ejected from the same nozzle. When the arc, the discharge plasma gas flow is small as the ionizing medium; cutting, then spew gas to exclude air flow of molten metal.
Air Cutting
Air plasma cutting generally use compressed air as the plasma gas, this method low cutting cost, convenient gas supply sources. Compressed air in the arc heating, decomposition and ionized oxygen generating cutting metal chemical exothermic reaction, accelerate cutting speeds. Enthalpy fully ionized air plasma value is high, and therefore large energy arc, cutting speed.
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