US 7,321,106 B2
TIG welding torch
William T. Matthews, Chesterland, Ohio (US); and Trang D. Nguyen, Mentor, Ohio (US)
Assigned to Lincoln Global, Inc., City of Industry, Calif. (US)
Filed on Sep. 10, 2004, as Appl. No. 10/938,918.
Prior Publication US 2006/0054609 A1, Mar. 16, 2006
Int. Cl. B23K 9/067 (2006.01)
U.S. Cl. 219—130.4  [219/75] 115 Claims
OG exemplary drawing
 
1. An electric arc processing device comprising: a torch with an electrode spaced from a workpiece and defining an arc gap; a connector at said torch for coupling said electrode to a power lead receiving power from a remotely located power source; a gas nozzle surrounding said electrode and having an internal passageway for directing gas from a gas supply, through said nozzle and against said workpiece; a high frequency generator remote from said torch for selectively creating a short burst of high frequency, high voltage across said gap at a given time; a conductive layer affixed to said gas nozzle and a conductor grounding said layer; a flexible tube extending between said torch and said power source with said grounding conductor extending along said flexible tube; and an outer electrically conductive sheath surrounding said power lead and wherein said grounding conductor being a part of said sheath.