CA2409420A1 - Plasma arc cutting process and apparatus using an oxygen-rich gas shield - Google Patents
Plasma arc cutting process and apparatus using an oxygen-rich gas shield Download PDFInfo
- Publication number
- CA2409420A1 CA2409420A1 CA002409420A CA2409420A CA2409420A1 CA 2409420 A1 CA2409420 A1 CA 2409420A1 CA 002409420 A CA002409420 A CA 002409420A CA 2409420 A CA2409420 A CA 2409420A CA 2409420 A1 CA2409420 A1 CA 2409420A1
- Authority
- CA
- Canada
- Prior art keywords
- gas
- flow
- secondary gas
- plasma arc
- oxidizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Plasma Technology (AREA)
- Arc Welding In General (AREA)
Abstract
A plasma arc torch (10) has a secondary gas flow (46) that is extremely large during piercing of a workpiece (36). The secondary flow (46) exits the torch immediately adjacent the transferred plasma arc (34) and is an extremely uniform, swirling flow. A
swirl ring (60) is located in the secondary gas flow path (50) at the exit point. A prechamber (58) feeds gas to the swirl ring (60), which is in turn fed through a flow restricting orifice (56). For certain applications the secondary gas (46) is a mixture of an oxidizing gas and a non-oxidizing gas in a flow ratio of oxydizing to non-oxidizing in the range of 2:3 to 9:1. A network (44) of conduits and solenoid valves (SV1-SV17) operated under the control of a central microprocessor (90) regulates the flows of plasma gas (42) and secondary gas (46) and mixes the secondary gas (46). The network (44) includes valued parallel branches (78,80,84,86) that provide a quick charge capability and a set of venting valves (SV11-SV14), also electrically actuated by the microprocessor (90), to provide a quick discharge. In a preferred high-definition embodiment, a nozzle (28) with a cut back outer surface and a large, conical head (28b) allows a metal seal and enhanced cooling.
swirl ring (60) is located in the secondary gas flow path (50) at the exit point. A prechamber (58) feeds gas to the swirl ring (60), which is in turn fed through a flow restricting orifice (56). For certain applications the secondary gas (46) is a mixture of an oxidizing gas and a non-oxidizing gas in a flow ratio of oxydizing to non-oxidizing in the range of 2:3 to 9:1. A network (44) of conduits and solenoid valves (SV1-SV17) operated under the control of a central microprocessor (90) regulates the flows of plasma gas (42) and secondary gas (46) and mixes the secondary gas (46). The network (44) includes valued parallel branches (78,80,84,86) that provide a quick charge capability and a set of venting valves (SV11-SV14), also electrically actuated by the microprocessor (90), to provide a quick discharge. In a preferred high-definition embodiment, a nozzle (28) with a cut back outer surface and a large, conical head (28b) allows a metal seal and enhanced cooling.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/682,992 US5166494A (en) | 1990-04-24 | 1991-04-12 | Process and apparatus for reducing electrode wear in a plasma arc torch |
| US682,991 | 1991-04-12 | ||
| US682,992 | 1991-04-12 | ||
| US07/682,991 US5170033A (en) | 1990-04-24 | 1991-04-12 | Swirl ring and flow control process for a plasma arc torch |
| US07/753,395 US5396043A (en) | 1988-06-07 | 1991-08-30 | Plasma arc cutting process and apparatus using an oxygen-rich gas shield |
| US753,395 | 1991-08-30 | ||
| CA002108121A CA2108121C (en) | 1991-04-12 | 1992-03-09 | Plasma arc cutting process and apparatus using an oxygen-rich gas shield |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002108121A Division CA2108121C (en) | 1991-04-12 | 1992-03-09 | Plasma arc cutting process and apparatus using an oxygen-rich gas shield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2409420A1 true CA2409420A1 (en) | 1992-10-29 |
| CA2409420C CA2409420C (en) | 2005-09-20 |
Family
ID=35170029
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002409409A Expired - Lifetime CA2409409C (en) | 1991-04-12 | 1992-03-09 | Nozzle for a plasma arc torch |
| CA002409420A Expired - Lifetime CA2409420C (en) | 1991-04-12 | 1992-03-09 | Plasma arc cutting process and apparatus using an oxygen-rich gas shield |
| CA002409405A Expired - Lifetime CA2409405C (en) | 1991-04-12 | 1992-03-09 | Control system for a gas flow to a plasma arc torch |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002409409A Expired - Lifetime CA2409409C (en) | 1991-04-12 | 1992-03-09 | Nozzle for a plasma arc torch |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002409405A Expired - Lifetime CA2409405C (en) | 1991-04-12 | 1992-03-09 | Control system for a gas flow to a plasma arc torch |
Country Status (1)
| Country | Link |
|---|---|
| CA (3) | CA2409409C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110315177A (en) * | 2019-08-06 | 2019-10-11 | 河北瓦尔丁科技有限公司 | Plasma power supply torch head accelerates gas path device |
-
1992
- 1992-03-09 CA CA002409409A patent/CA2409409C/en not_active Expired - Lifetime
- 1992-03-09 CA CA002409420A patent/CA2409420C/en not_active Expired - Lifetime
- 1992-03-09 CA CA002409405A patent/CA2409405C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2409409A1 (en) | 1992-10-29 |
| CA2409420C (en) | 2005-09-20 |
| CA2409405C (en) | 2007-02-27 |
| CA2409409C (en) | 2006-05-16 |
| CA2409405A1 (en) | 1992-10-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |