Using a hand held plasma cutter
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The video here shows how the plasma cutter cut the circular cut in the sheet with the help of a plasma cutter. The video specifically cut in the circular semiautomatic method. The machine can cut manually in any shape. The principle on which these plasma cutter works shows how a jet of ionized high speed and high-temperature gas once pass through a narrow aperture can make a cut. This ionized high-velocity gas is called as plasma passes through the plasma torch. The plasma once passed through the small aperture of the plasma torch, create a high-temperature zone. The high temperature with high-velocity gas blows away the metal and make a precise cut.