Plasma arc torch and method for cutting a workpiece

US6337460B2 · kind B2 · utility

Assignee

• Thermal Dynamics Corporation · US

Inventors

• Milind G. Kelkar · Pune, IN
• Kevin Horner-Richardson · Cornish, US
• Jesse A. Roberts · Colchester, US
• Geoffrey H. Putnam · Barre, US
• David Small · Strafford, US

Key dates

• Filing date: Jan 29, 2001
• Grant date: Jan 8, 2002
• Expiry date: Jan 29, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05H1/3478
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A plasma arc torch and method for cutting a workpiece in which the torch has a primary gas flow path for receiving a primary working gas and directing it through the torch to a central exit opening of the torch for exhaustion from the torch onto the workpiece in the form of an ionized plasma. A secondary gas flow path in the torch receives a secondary gas separate from the primary working gas and directs it through the torch. The primary gas flow path is in fluid communication with the secondary gas flow path substantially upstream of the central exit opening of the torch to bleed primary working gas in the primary gas flow path into the secondary gas flow path for admixture therewith to form a secondary gas mixture to be exhausted from the torch.