Abstract: A dual mode plasma arc torch and methods of operation thereof are provided, wherein the plasma arc torch is operable with both a high frequency power supply and a contact start power supply.

Abstract: A dual mode plasma arc torch is provided that preferably comprises a start cartridge disposed between an electrode and a tip. In one form, the start cartridge comprises an initiator that is in electrical contact with the electrode and that is resiliently biased into contact with the tip, such that when the plasma arc torch is in a contact start mode, the initiator is movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip. Further, when the plasma arc torch is in a high frequency start mode, the start cartridge spaces the tip from the electrode such that a pilot arc is established between the electrode and the tip. In other forms, a contact start torch is provided that is operable under high frequency, and conversely, a high frequency start torch is provided that is operable under low voltage.

Abstract: In a plasma arc torch parts distribution network, the present invention provides a method of providing plasma arc torch parts for use in a single plasma arc torch model through a plurality of distribution channels. In one form of the present invention, the method comprises the steps of providing a first set of plasma arc torch parts to a replacement parts distributor, providing a second set of plasma arc torch parts to an original equipment manufacturer, and providing a third set of plasma arc torch parts to a select original equipment manufacturer. The first, second, and third set of plasma arc torch parts are not interchangeable such that the replacement parts distributor, the original equipment manufacturer, and the select original equipment manufacturer maintain separate inventories of plasma arc torch parts.

Abstract: A series of replacement parts for use in a plasma arc torch is provided, wherein the parts have a color indicia and are adapted for use at different operating parameter values. Each part in the series has a color indicia formed on the part with a different color identifying the particular value of the operating parameter at which the part is adapted to operate. In another form, each part in the series is packaged in a package with a different color indicia identifying the particular value of the operating parameter at which the part is adapted to operate. Additionally, methods of packaging, applying the color indicia, selecting a package or part, and specifying a package or part are provided by the present invention.

Abstract: Vented shield systems for plasma arc torches are provided that comprise a shield cup body defining a distal end portion, a vented retainer secured to the distal end portion of the shield cup body, and a shield cap secured to the vented retainer. The vented retainer defines at least one vent passageway that directs a flow of secondary gas inward toward the shield cap, and the vented shield system blocks at least a portion of molten metal from contacting components, such as a tip or nozzle, of the plasma arc torch. The shield cap may comprise a mechanized cap, a drag cap, a gouging cap, or a deflector cap, among others. Accordingly, various shield caps may be employed without removal or replacement of the vented retainer. The same vented retainer may be used throughout a variety of plasma arc torch applications.

Abstract: A plasma torch and method for cutting a workpiece under water directs a primary gas through a primary gas flow path in the torch to a central exit opening of the torch disposed on a longitudinal axis of the torch for exhaustion from the torch onto the workpiece in the form of an ionized plasma. The workpiece is submerged in water while the plasma torch is operated in closely spaced relationship with the workpiece to direct the ionized plasma upon the workpiece. A secondary gas flow path in the torch receives a secondary gas separate from the primary gas and directs it through the torch. Concentrically arranged first and second sets of secondary exit openings are disposed in the torch separate from the central exit opening and in generally radially spaced relationship with the longitudinal axis of the torch. The secondary exit openings exhaust secondary gas from the torch in a direction generally toward the workpiece.