Union Carbide Corporation

The Esab Group Inc.

Esab Welding Products, Inc.

Larry Wade Stokes

Wayne Stanley Severance, Jr

Valerian Nemchinsky

Rue Allen Lynch

Tommie Zack Turner

Yosef Yerushalmy

Alfred William Marner

Wayne S Severance, Jr

Tommie Z Turner

Ding Quian

An electrode for a plasma arc torch comprises a copper holder having a lower end which mounts an emissive element serving as the cathode terminal for the arc during operation. A relatively non-emissive separator formed of silver alloyed with 0.5 to 4 percent of copper or other metals surrounds the emissive element and separates the emissive element from the copper holder at the exposed end face of the electrode. The separator serves to prevent the arc from detaching from the emissive element and attaching to the copper holder.

Electrode for plasma arc torch and method of making same

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.

Plasma arc torch having improved nozzle assembly

A gas shielded plasma arc torch and collet assembly having a collet for receiving and gripping an electrode wherein the collet has spherical front and rear surfaces for engagement of and rotation in seats within the torch and a means for locking the position of the collet thereby locking and fixing the position of the electrode with respect to the torch.

Gas shielded plasma arc torch and collet assembly

A gas shielded plasma arc torch having a collet for receiving and gripping an electrode wherein the collet has a portion with a substantially spherical surface geometry for engagement with and rotation in first and second seating means within the torch and means for locking the position of the collet thereby locking and fixing the position of the electrode with respect to the torch.

Gas shielded plasma arc torch with improved collet

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Florence, SC, United States of America

Larry Wade Stokes