US3584187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding stainless steel
Assignee: United States Steel Corp
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Filing: 1969-04-03
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Granted: 1971-06-08
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Expires: 1989-04-03
Abstract
Abstract A method for improving the weldability of stainless steels wherein, prior to welding by conventional processes, the steel surface is provided with a coating of at least one oxide selected from the group consisting of the oxides of iron, chromium, silicon, titanium, manganese, nickel, cobalt, molybdenum and calcium. The oxide coating may be applied by physically depositing a slurry of the oxide onto the steel surface, or by oxidizing the stainless steel surface by subjecting it to an elevated temperature in an oxidizing environment.
Inventors
- 👤 John C Majetich
- 👤 Ralph B G Yeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B23K35/36; B23K35/3601
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
The method of claim 1 in which said coating step includes applying water-glass onto said stainless steel surface, and allowing said water-glass to dry depositing an oxide coating including silicon dioxide.
Claim 2
Dependent Claim
46 words
The method of claim 1 wherein said coating step includes heating said stainless steel to a temperature in excess of 1400* F., and subjecting said heated steel to an oxidizing atmosphere for a time sufficient to allow the formation of an iron and chromium oxide coating.
Claim 3
Dependent Claim
24 words
The method of claim 3 wherein said heated steel is maintained in the oxidizing atmosphere for a period of from 2 to 15 minutes.
Claim 4
Dependent Claim
46 words
The method of claim 1 wherein said coating step includes forming a slurry consisting of a volatile liquid and a powdered form of said oxide, applying the slurry onto said stainless steel, and allowing the volatile liquid to evaporate depositing the oxide onto the steel surface.
Claim 5
Dependent Claim
18 words
The method of claim 5 wherein said applying step includes brushing the slurry onto the stainless steel surface.
Claim 6
Dependent Claim
18 words
The method of claim 5 wherein said applying step includes spraying said slurry onto the stainless steel surface.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein said volatile liquid is acetone.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein said oxide powder is finer than 100 mesh.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |