US4050958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing surface defects of a steel product
Assignee: Mitsubishi Electric Corp
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Filing: 1976-02-13
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Granted: 1977-09-27
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Expires: 1996-02-13
Abstract
Abstract A method of removing surface defects from the surface of a steel product, such as a slab designed for rolling, wherein the defects are melted by an arc generated by an arc welding apparatus having a non-consumable electrode, a guide nozzle about the electrode to maintain an inert gas atmosphere immediately thereabout, and a shield nozzle about the guide nozzle to inject a mainly carbon dioxide gas therefrom, and a deoxidizer is applied to the molten pool formed in the welding operation so as to cover the surface thereof with a slag formed by the deoxidizer which is oxidized.
Inventors
- 👤 Wataru Shimada
- 👤 Seigo Hiramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:35
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K9/00; B23K9/04; B23K9/16; B23K9/167; B23K9/24; B23K9/28; B23K9/29; B23K9/291; B23K9/296
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
In a method of removing surface defects of a steel product by melting the defects of the surface with an arc, the improvement characterized by using an arc generator which comprises a non-consumable electrode protected with an inert gas and means for shielding a molten pool formed on the surface of the steel product from air with a shield gas, comprising mainly carbon dioxide gas, and applying a deoxidizer to the molten pool to deoxidize it and cover the surface of the molten pool with a slag formed therewith by the deoxidizer which is oxidized.
Claim 2
Dependent Claim
95 words
In a method of removing surface defects of a steel product by melting the defects of the surface with an arc, the improvement characterized by using an arc generator which comprises a non-consumable electrode protected with an inert gas and means for shielding a molten pool formed on the surface of the steel product from air with a shield gas, comprising mainly carbon dioxide gas, and applying a deoxidizer to the molten pool to deoxidize it and cover the surface of the molten pool with a slag formed therewith by the deoxidizer which is oxidized.
Claim 3
Dependent Claim
61 words
The method of removing the surface defects of a steel product according to claim 1, wherein said arc generator is a torch for arc welding which comprises: said non-consumable electrode; guide nozzle means surrounding said non-consumable electrode for discharging a protective, inert gas; and shield nozzle means surrounding said guide nozzle for discharging a shield gas, comprising mainly carbon dioxide gas.
Claim 4
Dependent Claim
24 words
The method of removing the surface defects of a steel product according to claim 1, wherein said deoxidizer is one of silicon and manganese.
Claim 5
Dependent Claim
25 words
The method of removing the surface defects of a steel product according to claim 3, wherein said deoxidizer is in the form of a rod.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |