Patent US3583471A successfully refreshed from Google Patents.
US3583471A
Expired / Lapsed
US
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Manufacture of carbide-containing welding rods
Assignee: Individual
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Filing: 1968-12-17
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Granted: 1971-06-08
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Expires: 1988-12-17
Abstract
Abstract Carbide-containing welding rods for use in the deposition by welding of wear-resistant layers are made from a melt by a process in which, while the melt is continuously stirred, the carbide, which is in granular form and has a melting point above the temperature of the melt, is added to the melt and portions of the carbide-containing melt are then drawn off into heat resistant vacuum tubes where they are allowed to solidify to form the rods.
Inventors
- 👤 Erich Kemming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:45
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/327
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A process as claimed in claim 1, in which a basic melt which consists of up to 3 percent carbon, from 15 percent to 35 percent chromium, from 40 percent to 65 percent cobalt, up to 4 percent silicon and the remainder iron, is added up to about 40 percent of tungsten carbide all the percentage of said tungsten carbide being by weight of the entire melt.
Claim 2
Dependent Claim
21 words
A process as claimed in claim 2, in which at least 7 percent of tungsten carbide is added to said melt.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 2, wherein said tungsten carbide is added in the form of mixed crystals containing titanium, tantalum or niobium carbide.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1, in which said carbide is tungsten carbide with a grain size of about 1 micron and is manufactured by melting together tungsten and carbide.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1, in which the carbon content of said melt before the addition of said carbide is less than 1 percent by weight.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 1, wherein said melt includes cobalt and carbon and further comprising the step of adding chromium to said melt after adding said carbide.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 1, further comprising the step of water-cooling said vacuum tubes.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 1, in which said vacuum tubes are made of quartz.
Claim 9
Dependent Claim
16 words
A process as claimed in claim 1, wherein said continuous stirring is performed by electrical induction.
References Cited (Backward Citations)
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Cited
US1897589A
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US2002198A
Cited
US1950356A
Cited
US2162574A
Cited
US2952056A
Cited
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 |