US4190760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding apparatus with shifting magnetic field
Assignee: Kobe Steel Ltd
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Filing: 1977-05-16
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Granted: 1980-02-26
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Expires: 1997-05-16
Abstract
Abstract The present invention relates to a welding process and apparatus. More particularly, the invention relates to a welding process and apparatus for performing welding in various positions characterized in that a shifting magnetic field is generated in the vicinity of a molten metal pool to induce an eddy current in the molten metal pool, whereby an electromagnetic driving force is caused to act on the molten metal pool to control the shape of the molten metal pool, and welding is carried out while controlling the shape of the molten metal pool in this manner. According to the welding process and apparatus of the present invention, the welding efficiency can be enhanced irrespective of any welding positions.
Inventors
- 👤 Motomi Kano
- 👤 Keiichiro Hirakoso
- 👤 Katsuhiko Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/08; H; H01; H01F; H01F5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A welding apparatus for controlling shapes of molten metal pools, which comprises means for supplying heat energy for welding, means for moving said energy supplying means relatively to a base metal to be welded, means for generating in the vicinity of a molten metal pool a magnetic field making a periodical electromagnetic change and means for moving said magnetic field generating means relatively to the base metal wherein said means for generating a magnetic field includes a pair of driving coils and said driving coils are disposed so that their centers are staggered from each other by a distance corresponding to the radius of at least one of said driving coils.
Claim 2
Dependent Claim
111 words
A welding apparatus for controlling shapes of molten metal pools, which comprises means for supplying heat energy for welding, means for moving said energy supplying means relatively to a base metal to be welded, means for generating in the vicinity of a molten metal pool a magnetic field making a periodical electromagnetic change and means for moving said magnetic field generating means relatively to the base metal wherein said means for generating a magnetic field includes a pair of driving coils and said driving coils are disposed so that their centers are staggered from each other by a distance corresponding to the radius of at least one of said driving coils.
Claim 3
Dependent Claim
30 words
A welding apparatus as set forth in claim 1 wherein said means for supplying heat energy includes an arc welding rod inserted into a space defined by said driving coils.
Claim 4
Dependent Claim
31 words
A welding apparatus as set forth in claim 1 wherein each of said driving coils comprise a main coil portion, driving coil terminals, and a subsidiary coil for preventing induction coupling.
Claim 5
Dependent Claim
111 words
A welding apparatus for controlling shapes of molten metal pools, which comprises means for supplying heat energy for welding, means for moving said energy supply means relatively to a base metal to be welded, means for generating in the vicinity of a molten metal pool a magnetic field making a periodical electromagnetic change and means for moving said magnetic field generating means relatively to the base metal wherein said means for generating a magnetic field includes at least one pair of driving coils each coil consisting of a main coil and an interconnected subsidiary coil and means for passing at least two electric currents having different phases through said driving coils.
Claim 6
Dependent Claim
111 words
A welding apparatus for controlling shapes of molten metal pools, which comprises means for supplying heat energy for welding, means for moving said energy supply means relatively to a base metal to be welded, means for generating in the vicinity of a molten metal pool a magnetic field making a periodical electromagnetic change and means for moving said magnetic field generating means relatively to the base metal wherein said means for generating a magnetic field includes at least one pair of driving coils each coil consisting of a main coil and an interconnected subsidiary coil and means for passing at least two electric currents having different phases through said driving coils.
Claim 7
Dependent Claim
30 words
A welding apparatus as set forth in claim 4 wherein said means for supplying heat energy includes an arc welding rod inserted into a space defined by said driving coils.
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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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |