Gas mixtures for plasma arc torch cutting and marking systems

Details Gas mixtures for plasma arc torch cutting and marking systems Gas mixtures for plasma arc torch cutting and marking systems

1996-09-03

1998-06-30

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912141, 21912156, 21912155, B23K 1000

Patent

active

057737886

ABSTRACT:
A method of operating a plasma arc torch for marking a metallic workpiece spaced a stand-off distance from the torch utilizes a torch that includes a body, an electrode, and a nozzle mounted in the body so as to define a plasma chamber. The nozzle has a central passage and an exit orifice through which the transferred arc passes to the workpiece. The method also utilizes a plasma gas flow through the body to form a pilot arc in the plasma chamber and then to form a transferred arc between the electrode and the workpiece. The method includes forming the plasma gas flow with a selected mixture of hydrogen and an inert gas. The percentage of hydrogen in the selected mixture is between 0% and 35%. The percentage of inert gas in the selected mixture is between 100% and 65%. The inert gas may be argon.

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