Plasma cutting torch electrode with an Hf/Zr insert

Details Plasma cutting torch electrode with an Hf/Zr insert Plasma cutting torch electrode with an Hf/Zr insert

2005-06-28

2005-06-28

Paschall, Mark (Department: 3742)

Electric heating

Metal heating

By arc

C219S121590, C219S119000

Reexamination Certificate

active

06911619

ABSTRACT:
An emissive electrode insert formed from an alloy containing hafnium and zirconium. The insert typically contains at least about 80% hafnium by weight and about 0.1 to about 8% zirconium by weight. The invention also relates to a plasma torch electrode formed from an electrode body with a cavity into which such an emissive insert is fitted, to a plasma torch utilizing such an electrode, and to a plasma cutting process for cutting a steel workpiece, in which such a plasma torch is employed.

REFERENCES:
patent: 3198932 (1965-08-01), Weatherly
patent: 5105061 (1992-04-01), Blankenship
patent: 5767478 (1998-06-01), Walters
patent: 6420673 (2002-07-01), Nemchinsky
patent: 2004/0066827 (2004-04-01), Steiger et al.
patent: 0 822 736 (1996-04-01), None
patent: 2 173 874 (1972-06-01), None
patent: 2 628 253 (1989-03-01), None

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