Discuss plasma arc cutting, how it works, and its advantages.

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?Plasma arc cutting creates an intensely hot air stream, which melts and removes metal over a very small area. Extremely clean cuts are possible with plasma arc cutting. Because of the tight focus of the heat, there is no warpage, even when cutting thin sheet metal. Plasma arc cutting is replacing oxyacetylene as the best way to cut metals. It cuts damaged metal effectively and quickly but does not destroy the properties of the base metal. In plasma arc cutting, compressed air is often used for both shielding and cutting. As a shielding gas, air covers the outside area of the torch nozzle, cooling the area so the torch does not overheat. 

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Which of the following statements is true?

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