Patent US3710068A successfully refreshed from Google Patents.
US3710068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating of welding slag for better starting
Assignee: British Steel Corp
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Filing: 1971-01-20
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Granted: 1973-01-09
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Expires: 1991-01-20
Abstract
Abstract A method of producing an electroslag welded bond between spaced metal bodies. In particular a trough is located beneath the bodies so as to bridge the whole length of the gap between them and slag in either a molten or a dry powdered state is placed in the trough and pre-heated by a source (e.g., an induction coil) operative to produce uniform heat transfer along the whole length of the gap to facilitate the start of welding.
Inventors
- 👤 E Calton
- 👤 A Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:01
CPC Classifications
B; B23; B23K; B23K25/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating beneath the bodies so as to bridge the whole length and width of the gap between them, mounting an electrically energizable coil around the trough, placing slag in the trough, energizing the coil and pre-heating the slag by electrical induction from said coil thereby producing uniform heat transfer along the whole length of the gap during starting, and forming said welded bond by immersing consumable welding electrodes in the slag and passing current through them.
Claim 2
Independent Claim
96 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating beneath the bodies so as to bridge the whole length and width of the gap between them, mounting an electrically energizable coil around the trough, placing slag in the trough, energizing the coil and pre-heating the slag by electrical induction from said coil thereby producing uniform heat transfer along the whole length of the gap during starting, and forming said welded bond by immersing consumable welding electrodes in the slag and passing current through them.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the slag is placed in the trough as a dry powder.
Claim 4
Independent Claim
107 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating a trough beneath the bodies so as to bridge the whole length and width of the gap between them, mounting a resistance heater in the form of a rod so that it extends along the whole length of the trough, placing slag in the trough, electrically energizing the resistance heater and preheating the slag thereby producing uniform heat transfer along the whole length of the gap during starting, and forming said welded bond by immersing consumable welding electrodes in the slag and passing current through them.
Claim 5
Independent Claim
107 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating a trough beneath the bodies so as to bridge the whole length and width of the gap between them, mounting a resistance heater in the form of a rod so that it extends along the whole length of the trough, placing slag in the trough, electrically energizing the resistance heater and preheating the slag thereby producing uniform heat transfer along the whole length of the gap during starting, and forming said welded bond by immersing consumable welding electrodes in the slag and passing current through them.
Claim 6
Dependent Claim
18 words
A method according to claim 3, wherein the slag is placed in the trough in a molten state.
Claim 7
Dependent Claim
18 words
A method according to claim 3, wherein the slag is placed in the trough as a dry powder.
Claim 8
Independent Claim
83 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating a trough beneath the bodies so as to bridge the whole length and width of the gap between them, placing slag in the trough, electrically preheating the slag thereby producing uniform heat transfer along the whole length of the gap, immersing consumable welding electrodes into the slag and passing current through them whereby to produce a welded bond between the said bodies.
Claim 9
Independent Claim
83 words
A method of producing an electroslag welded bond between spaced metal bodies by consumable electrode welding comprising the steps of locating a trough beneath the bodies so as to bridge the whole length and width of the gap between them, placing slag in the trough, electrically preheating the slag thereby producing uniform heat transfer along the whole length of the gap, immersing consumable welding electrodes into the slag and passing current through them whereby to produce a welded bond between the said bodies.
Claim 10
Dependent Claim
17 words
A method according to claim 6, wherein the metal bodies are separately heated by an auxiliary source.
Claim 11
Dependent Claim
124 words
Apparatus for producing an electroslag welded bond between spaced metal bodies by consumable electrode welding, comprising: means for supporting metal bodies in spaced relationship whereby to define a gap between them, said means including a trough disposed below a gap for receiving and for holding slag and so dimensioned as to bridge the whole length and width of a gap between two spaced metal bodies, and an electrical heating source disposed on said trough for heating slag in the trough and which is effective to produce uniform heat transfer along the whole length of the trough to facilitate the start of welding; means for advancing consumable electrodes and feeding them toward the trough; and means for passing current through the electrodes for melting them.
Claim 12
Dependent Claim
124 words
Apparatus for producing an electroslag welded bond between spaced metal bodies by consumable electrode welding, comprising: means for supporting metal bodies in spaced relationship whereby to define a gap between them, said means including a trough disposed below a gap for receiving and for holding slag and so dimensioned as to bridge the whole length and width of a gap between two spaced metal bodies, and an electrical heating source disposed on said trough for heating slag in the trough and which is effective to produce uniform heat transfer along the whole length of the trough to facilitate the start of welding; means for advancing consumable electrodes and feeding them toward the trough; and means for passing current through the electrodes for melting them.
References Cited (Backward Citations)
US2937422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |