US4174477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for arc welding
Assignee: US Philips Corp
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Filing: 1977-05-24
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Granted: 1979-11-13
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Expires: 1997-05-24
Abstract
Abstract A method of plasma MIG welding in which an arc is maintained between a workpiece and a welding wire in a thermally ionized gas (auxiliary plasma) which is generated by an electric gas-discharge between two non-consumable electrodes; neither the welding wire nor the workpiece acts as a single electrode for generating the thermally ionized gas.
Inventors
- 👤 Wilhelmus G. Essers
- 👤 Gerardus Jelmorini
- 👤 Gerrit W. Tichelaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
B; B23; B23K; B23K10/00; B23K10/02; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/3421; H05H1/3452
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A method of arc welding, which comprises flowing a thermally ionizable gas past and within the region of two non-consumable electrodes horizontally spaced from each other and terminating in a horizontal plane establishing a secondary (plasma) arc solely between said two horizontally spaced non-consumable electrodes to initiate and sustain a plasma flow, feeding a consumable electrode between said two horizontally spaced electrodes and through said plasma flow toward a workpiece, and separately and independently establishing a primary (MIG) arc solely between said consumable electrode and the workpiece.
Claim 2
Independent Claim
87 words
A method of arc welding, which comprises flowing a thermally ionizable gas past and within the region of two non-consumable electrodes horizontally spaced from each other and terminating in a horizontal plane establishing a secondary (plasma) arc solely between said two horizontally spaced non-consumable electrodes to initiate and sustain a plasma flow, feeding a consumable electrode between said two horizontally spaced electrodes and through said plasma flow toward a workpiece, and separately and independently establishing a primary (MIG) arc solely between said consumable electrode and the workpiece.
Claim 3
Dependent Claim
20 words
A method according to claim 1, in which the plasma flow concentrically surrounds the end portion of the consumable electrode.
Claim 4
Dependent Claim
133 words
Apparatus for arc welding, which comprises a welding torch provided with two non-consumable electrodes horizontally spaced from each other and terminating in a horizontal plane, means for flowing a thermally ionizable gas past and within the region of said two horizontally spaced non-consumable electrodes, a first circuit means including said two horizontally spaced non-consumable electrodes and a first power supply for establishing a secondary (plasma) arc solely between said two horizontally spaced non-consumable electrodes to initiate and sustain a plasma flow, means for feeding a consumable electrode between said two horizontally spaced electrodes and through said plasma flow toward a workpiece, and second circuit means including said consumable electrode, a second power supply, and said workpiece for separately and independently establishing a primary (MIG) arc solely between said consumable electrode and said workpiece.
Claim 5
Dependent Claim
133 words
Apparatus for arc welding, which comprises a welding torch provided with two non-consumable electrodes horizontally spaced from each other and terminating in a horizontal plane, means for flowing a thermally ionizable gas past and within the region of said two horizontally spaced non-consumable electrodes, a first circuit means including said two horizontally spaced non-consumable electrodes and a first power supply for establishing a secondary (plasma) arc solely between said two horizontally spaced non-consumable electrodes to initiate and sustain a plasma flow, means for feeding a consumable electrode between said two horizontally spaced electrodes and through said plasma flow toward a workpiece, and second circuit means including said consumable electrode, a second power supply, and said workpiece for separately and independently establishing a primary (MIG) arc solely between said consumable electrode and said workpiece.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |