Plasma Torch


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plasma torch

[′plaz·mə ‚tȯrch]
(engineering)
A torch in which temperatures as high as 50,000°C are achieved by injecting a plasma gas tangentially into an electric arc formed between electrodes in a chamber; the resulting vortex of hot gases emerges at very high speed through a hole in the negative electrode, to form a jet for welding, spraying of molten metal, and cutting of hard rock or hard metals.

Plasma Torch

 

a hand-operated arc plasmatron used in applying coatings, cutting, welding, hard facing, and other processes. Two types exist; they differ in their principle of operation, using either plasma arcs or plasma jets. For mechanized work plasma torches are attached to special mounts. When used in applying coatings and in hard facing, they are usually equipped with devices for feeding the material to be sprayed or hard faced, which is in the form of a powder or wire. Such plasma torches are called plasma heads. The power output of plasma torches may be as high as 100 kilowatts. Ar, He, N2, NH3, air, and mixtures thereof can be used as plasma-forming gases. Various methods of initiating the arc discharge are possible; for example, the gap between the torch’s cathode and anode—for a plasma jet —or between the cathode and the metal being processed—for a plasma arc—may be closed.

References in periodicals archive ?
Three-dimensional simulation of argon--hydrogen DC non--transferred arc plasma torch, International Journal of Heat and Mass Transfer 80: 644-652.
Direct disturbance on the plasma torch may cause the shut-down or the instability during the operation.
TPT developed a breakthrough technology and processing system, using ultra-temperature radio frequency plasma torch, to extract latent precious metals from certain types of complex ores.
Calculated voltage-current characteristic of plasma torch (the length of anode after stair is 14 mm) with different plasma-forming gas debits: 1 - G = 5 l/min; 2 - G = 10 l/min; 3 - G = 15 l/min
The grinder is heavier and harder to hold than the plasma torch and grinding presents safety hazards, such as eye injuries, from flying debris.
The plasma torch used nitrogen and air as feedstocks and was placed downstream of the injector as an ignition aid.
Melbourne, June 24 (ANI): Scientists at the University of Southern California (USC) have come up with the world's smallest plasma torch that may one day make root canal treatment faster and less painful, besides reducing the chance of infection after the procedure.
1989) Plasma torch with power supply for ignition and stabilization of burning in Donetsk Ash.
Equipped with the 1Torch plasma torch and patent pending ACT (Advanced Torch Connector) quick disconnect
The Plasma-Pal motorized hole cutter attaches to any standard hand held plasma torch to automatically cut accurate holes.
Instead, he opted to "buy a robot, put a plasma torch on the end, and actually cut the heat shield out of a piece of tubing.
5 MW transportable plasma torch system in a production foundry cupola line (90-152) at the Peugeot Auto factory in 1986-87 were presented by G.

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