Plasma arc torch having improved nozzle assembly

Details Plasma arc torch having improved nozzle assembly Plasma arc torch having improved nozzle assembly

B - Operations, Transporting

23

K

B23K 9/167 (2006.01) B23K 10/00 (2006.01) H05H 1/34 (2006.01) H05H 1/28 (2006.01)

Patent

CA 2075316

-20- Abstract of the Disclosure A plasma arc torch is disclosed and includes an electrode defining a discharge end and a longitudinal axis. A nozzle base, formed of metallic material, is positioned adjacent the discharge end of the electrode. The nozzle base has an outer, annular configured mounting surface and a frusto-conical surface positioned adjacent the mounting surface and tapering toward the longitudinal axis in a direction away from the electrode. A lower nozzle member, formed of metallic material, is secured onto the nozzle base mounting surface on the side opposite the electrode, and includes an interior surface spaced from the outer frusto-conical surface of the nozzle base to form a water passage. A ceramic insulator is secured onto the outer surface of the lower nozzle member and extends substantially along that surface for preventing double arcing and insulating the lower nozzle member from heat and plasma generated during torch operation. In a one embodiment the ceramic insulator is secured by means of glue. In another embodiment, the ceramic insulator is secured by an O-ring. 41543

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