US3789230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding current generator having two interconnected sources
Assignee: Individual
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Filing: 1972-09-29
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Granted: 1974-01-29
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Expires: 1992-09-29
Abstract
Abstract Device adapted to provide welding current to automatic arc welding apparatus having a non-fusible electrode. The device comprises a first single-phase current source and a second threephase current source having means associated with each source for controlling the strength of the current fed by the source. A first rectifier arrangement is connected to the three-phase source for rectifying the current fed by such source and a second rectifying arrangement including a periodic interrupter is connected to the output of the single-phase source for providing a pulsed current. The output of the first and second rectifier arrangements are connected in parallel to the welding electrodes so as to permit superposition of the current fed by the first and second sources, and a switch is provided for short-circuiting the second rectifier arrangement for providing, when the switch is open, a pulsed current superposed on a direct current and, when the switch is closed, an alternating current superposed on the direct current.
Inventors
- 👤 S Paulange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; B; B23; B23K; B23K9/00; B23K9/09; B23K9/091; B23K9/092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
Device adapted to provide welding current to automatic arc welding apparatus comprising a first single-phase current source and a second three-phase current source, means associated with each source for controlling the strength of the current fed by each source, a first rectifier arrangement connected to said three-phase source for rectifying the current fed by said threephase source, a second rectifier arrangement including periodic interrupters connected to the output of said single-phase source for providing a pulsed current, whereing said periodic interrupters being thyristors permitting to obtain current pulses at predetermined time intervals, means for connecting the output of said first and second rectifier arrangements in parallel to the welding electrode so as to permit superposition of the current fed by said first and second sources, and a switch for short-circuiting said second rectifier arrangement for providing, when the switch is open, a pulsed current superposed on a direct current and, when the switch is closed, an alternating current superposed on a direct current.
Claim 2
Dependent Claim
163 words
Device adapted to provide welding current to automatic arc welding apparatus comprising a first single-phase current source and a second three-phase current source, means associated with each source for controlling the strength of the current fed by each source, a first rectifier arrangement connected to said three-phase source for rectifying the current fed by said threephase source, a second rectifier arrangement including periodic interrupters connected to the output of said single-phase source for providing a pulsed current, whereing said periodic interrupters being thyristors permitting to obtain current pulses at predetermined time intervals, means for connecting the output of said first and second rectifier arrangements in parallel to the welding electrode so as to permit superposition of the current fed by said first and second sources, and a switch for short-circuiting said second rectifier arrangement for providing, when the switch is open, a pulsed current superposed on a direct current and, when the switch is closed, an alternating current superposed on a direct current.
Claim 3
Dependent Claim
38 words
Device as defined in claim 1, wherein the means for controlling the strength of the current sources consist of saturable self-inductors connected one to each phase of the source and controlled by a control device for each source.
Claim 4
Dependent Claim
36 words
Device as defined in claim 3, wherein said control device includes means for regulating the amplitude of the current and means for varying such amplitude in a periodic manner, each means acting separately Or in combination.
Claim 5
Dependent Claim
32 words
Device as defined in claim 4, wherein said means for varying the amplitude of the current in a periodic manner is a rotary programmer providing pulses or periodic modulations of the current.
Claim 6
Dependent Claim
42 words
A device as defined in claim 4, wherein said first and second current sources are transformers the primary of which is saturated whereby the control of the strength of the current or of the periodic interrupters is not influenced by the transformers.
Claim 7
Dependent Claim
45 words
Device as defined in claim 1, wherein the operation of the switch is coordinated with the operation of the periodic interrupter so as to obtain various current combinations by superposition of the single-phase current rectified or not with the rectified three-phase current modulated or not.
Claim 8
Dependent Claim
82 words
Device as defined in claim 3, wherein said first and second sources and their associated elements are located in a signle housing and wherein said control device includes first means for controlling the strength of the current of each of the sources, second means for controlling the time and the periodicity of closure of the thyristors, third means for controlling the cyclic modulations of the saturable self-inductors, and a fourth means for opening and closing the switch associated with the single-phase source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |