Method and apparatus for automatic gas control for a plasma arc torch
US8809728B2 · kind B2 · utility
10Cited by
94References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2007 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K10/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus for controlling a gas supply to a plasma arc torch uses a proportional control solenoid valve positioned adjacent the torch to manipulate the gas flow to the torch, thereby extending electrode life during arc transfer and shutdown. Swirl ring design can be simplified and gas supply and distribution systems become less complicated. The invention also allows manipulation of shield gas flow to reduce divot formation when making interior cuts. The system can be controlled with a digital signal processor utilizing a feedback loop from a sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.