US4087671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for plasma-MIG welding
Assignee: US Philips Corp
•
Filing: 1976-03-01
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Granted: 1978-05-02
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Expires: 1996-03-01
Abstract
Abstract A device for plasma-MIG welding comprising a welding torch provided with a non-consumable electrode and a supply of a welding wire, the non-consumable electrode being connected to a first power supply source having a drooping voltage characteristic and the welding wire being connected to a second power supply source having a constant voltage characteristic, the first power supply source being connected in series with the second power supply source, thereby improving the stability of the plasma arc.
Inventors
- 👤 Wilhelmus Gerardus Essers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:39
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; B; B23; B23K; B23K10/00; B23K10/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
A device for plasma-MIG welding, which comprises a welding torch including a housing provided with a nozzle to be positioned relative to a workpiece to be welded but out of contact therewith, a non-consumable electrode arranged within the housing out of contact with the workpiece, a contact tube arranged within the housing for supplying a welding wire through the nozzle toward the workpiece but out of contact therewith, means for supplying a plasma gas to the housing and through the nozzle, a first power supply source having a drooping voltage characteristic and connected to the non-consumable electrode, and a second power supply source having a constant voltage characteristic and connected to the contact tube with its associated welding wire for solely maintaining a MIG arc between the welding wire and the workpiece, the first power supply source being connected in series with the second power supply source at a point between such second power supply source and its connection to the contact tube with its associated welding wire for maintaining a plasma arc between the non-consumable electrode and the workpiece.
Claim 2
Independent Claim
180 words
A device for plasma-MIG welding, which comprises a welding torch including a housing provided with a nozzle to be positioned relative to a workpiece to be welded but out of contact therewith, a non-consumable electrode arranged within the housing out of contact with the workpiece, a contact tube arranged within the housing for supplying a welding wire through the nozzle toward the workpiece but out of contact therewith, means for supplying a plasma gas to the housing and through the nozzle, a first power supply source having a drooping voltage characteristic and connected to the non-consumable electrode, and a second power supply source having a constant voltage characteristic and connected to the contact tube with its associated welding wire for solely maintaining a MIG arc between the welding wire and the workpiece, the first power supply source being connected in series with the second power supply source at a point between such second power supply source and its connection to the contact tube with its associated welding wire for maintaining a plasma arc between the non-consumable electrode and the workpiece.
Claim 3
Dependent Claim
35 words
A device according to claim 1, in which the contact tube with its associated welding wire is arranged coaxially and the non-consumable electrode is arranged eccentrically with respect to the centre line of the housing.
Claim 4
Dependent Claim
32 words
A device according to claim 1, in which the contact tube with its associated wire and the non-consumable electrode are arranged one on each side of the centre line of the housing.
Claim 5
Dependent Claim
16 words
A device according to claim 1, in which the non-consumable electrode is constituted by the nozzle.
References Cited (Backward Citations)
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US3891824A
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US3783229A
Cited
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US3832513A
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US3997756A
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |