Plasma arc torch starting process having separated generated flows of non-oxidizing and oxidizing gas
US5017752A · kind A · utility
41Cited by
14References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Mar 2, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H1/3468
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for starting a plasma arc torch is disclosed which minimizes the oxidation of the electrode to thereby extend the life of the electrode. A flow of non-oxidizing gas is first generated between the discharge end of the torch electrode and the nozzle assembly of the torch. A pilot arc then is created between the discharge end of the electrode and the nozzle assembly. The pilot arc is transferred and the flow of non-oxidizing gas is terminated. A flow of oxidizing gas then is generated for plasma formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.