US4039802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of automatic or semi-automatic welding with gases
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1976-12-01
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Granted: 1977-08-02
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Expires: 1996-12-01
Abstract
Abstract The invention relates to an improved method of automatic or semi-automatic welding with gas, or brazing, effected by using a coil of fillet wire brought to the welding point by continuously passing through the center of a gas flame, (oxy-acetylene, oxygen-propane for example) which melts the wire and heats the work part, said improvement comprising the application of an electrical voltage between a member mounted on the forward-movement path of the fillet wire and the work part under treatment, so as to cause the passage therein of a heating current. The electrical voltage is preferably applied either between the welding torch nozzle or the forward-movement rollers and the part treated.
Inventors
- 👤 Tamotsu Kotani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:36
CPC Classifications
B; B23; B23K; B23K28/00; B23K28/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A method of welding a work part by use of a gas flame, comprising the steps of: supplying a combustion-supporting gas and a combustible gas, respectively, for mixture; projecting said mixture in the form of a ring to form a ring-shaped flamed; feeding an electrically conductive fillet wire from a source of fillet wire through said ring-shaped gas flame to a position spaced from said work part; heating said fillet wire and said work part by said flame such that the end of said fillet wire spaced from said work part is heated to a molten state to melt onto said work part; applying a voltage between said work part and said fillet wire; and further heating said fillet wire independently of said gas flame by passing a short-circuit current through said fillet wire, said short-circuit current flowing through said molten fillet wire and said work part when said molten wire drops into electrical circuit contact between said work part and said fillet wire.
Claim 2
Independent Claim
164 words
A method of welding a work part by use of a gas flame, comprising the steps of: supplying a combustion-supporting gas and a combustible gas, respectively, for mixture; projecting said mixture in the form of a ring to form a ring-shaped flamed; feeding an electrically conductive fillet wire from a source of fillet wire through said ring-shaped gas flame to a position spaced from said work part; heating said fillet wire and said work part by said flame such that the end of said fillet wire spaced from said work part is heated to a molten state to melt onto said work part; applying a voltage between said work part and said fillet wire; and further heating said fillet wire independently of said gas flame by passing a short-circuit current through said fillet wire, said short-circuit current flowing through said molten fillet wire and said work part when said molten wire drops into electrical circuit contact between said work part and said fillet wire.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said fillet wire is fed by roller means to pass in contact with a nozzle of a welding torch.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said nozzle is electrically conductive and said voltage is applied between said work part and said nozzle.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein said roller means are electrically conductive and said voltage is applied between said work part and said roller means.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |