Plasma Arc Machining (PAM)
4.2.1 Introduction
Plasma is an ionized gas which is of ions, electrons, and neutral particles. Plasma is also called as fourth state of matter. When the electric arc is passed through the certain gas such as air, hydrogen, nitrogen and argon etc., the temperature of a gas is raised to the higher value and the gases become ionized. The gas in this stage is termed as plasma. The plasma gas strikes on the workpiece materials with high heat and kinetic energy. The temperature of the workpiece surface increases above the melting point and the material is melted and vaporized. Machining by plasma was adopted in the early 1950s as an alternative method for oxy-fuel flame cutting. In oxy-fuel cutting the ...
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