This section includes Plasma cutters and Plasma Welding which is one of the newest welding procedures. It is a method of tungsten gas shielded arc welding. It involves a concentrated electric arc with a high energy density. The electric arc is created by a water cooled copper nozzle with narrow bore holes, through which the electric arc passes. It has an almost cylindrical shape, and diverges by just a few degrees. This results in a high energy density. The electric arc burns on the needle-like tungsten electrode in the plasma nozzle. It is cleaned using plasma gas. Indeed, the gas emitted through the small borehole can not provide long-range protection during welding. Shielding gas is therefore supplied through a second nozzle. The plasma welding procedure offers ignition reliability, and directionally stable electric arcs with low heat input.
The plasma arc welding and cutting process was invented by Robert M. Gage in 1953 and patented in 1957. The process was unique in that it could achieve precision cutting and welding on both thin and thick metals.
It involves a concentrated electric arc with a high energy density. The electric arc is created by a water cooled copper nozzle with narrow bore holes, through which the electric arc passes. It has an almost cylindrical shape, and diverges by just a few degrees. This results in a high energy density. The electric arc burns on the needle-like tungsten electrode in the plasma nozzle. It is cleaned using plasma gas. Indeed, the gas emitted through the small borehole can not provide long-range protection during welding. Shielding gas is therefore supplied through a second nozzle. The plasma welding procedure offers ignition reliability, and directionally stable electric arcs with low heat input.
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