Circuit means for automatically establishing an arc in a plasma flame spraying gun
US3949266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Sep 5, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/134
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An improvement in a plasma flame spraying apparatus, particularly one in which at least two gases form the plasma, which improvement comprises means associated with the plasma gas inlet, said means being time related to an increase in the current through the arc maintained in the plasma flame spray gun, said current and said means associated with the plasma gas inlet each independently being associated with a timing means whereby the full flow of a secondary gas through the nozzle of the gun and the electric arc established therein is substantially simultaneous with an establishment of a full current level through the electric arc through which said secondary gas passes; a fully automatic ignition system for a plasma gas flame spraying process whereby establishment of an optimum gas mixture for normal operation is time coordinated with respect to start-up of the current passing in the circuit of the electric arc in the gun, such that the current rise and rise of secondary gas flow through the gun occur within a relatively narrow time window established therefor; a means for insuring that initial establishment of the arc in the circuit of said gun is established automatically, which…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.