Imported: 23 Feb '17 | Published: 22 Oct '02
USPTO - Utility Patents
An installation and a method for oxygen arc cutting of a metal workpiece containing at least a ferrous material, in particular a structural steel workpiece, which consists in: pre-heating locally a priming zone of the metal workpiece to be cut by subjecting the priming zone to a plasma jet; then in producing a localized fusion and/or combustion of the ferrous material contained in the workpiece, using the plasma jet or a combination of the plasma jet and an oxidizing gas flow to obtain a perforation along the whole thickness of the metal workpiece; once the perforation has been obtained, in synchronously displacing, the plasma jet and the oxidizing gas flow along a cutting path to produce a predefined slit through the metal workpiece.
The invention will now be described in greater detail with the aid of examples of embodiments shown schematically in the appended figures, which are given by way of illustration but imply no limitation.
a shows a diagram of a first embodiment of a unit according to the invention of the type with convergent jets.
1. A process for the plasma oxycutting of at least one metal workpiece containing at least one ferrous metal, in particular iron, in which:
2. The process as claimed in
3. The process as claimed in
4. The process as claimed in
5. The process as claimed in
6. The process as claimed in
7. The process as claimed in