![]() ![]() The main cutting arc then transfers to the workpiece through the column of plasma gas in Zone C. In a Plasma Cutting Torch a cool gas enters Zone B, where a pilot arc between the electrode and the torch tip heats and ionises the gas. Once the pilot arc has ionised the plasma gas, the superheated column of gas flows through the small orifice in the torch tip, which is focused on the metal to be cut. Inside the torch, the pilot arc starts in the gap between the negatively charged electrode and the positively charged tip. ![]() They consist of negative and positive sections separated by a center insulator. Plasma torches are similar in design to the automotive spark plug. ![]() While the goal of plasma arc cutting is the separation of the material, plasma arc gouging is used to remove metals to a controlled depth and width. The metal to be cut or removed is melted by the heat of the arc and then blown away. The plasma arc cutting and gouging processes use this plasma to transfer an electrical arc to the workpiece. Plasma is a fourth state of matter, an ionised gas which has been heated to an extremely high temperature and ionised so that it becomes electrically conductive. ![]()
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