Patent US3855447A successfully refreshed from Google Patents.
US3855447A
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US
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Weld additive for electric-arc deposit welding
Assignee: STARCK H DT
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Filing: 1973-05-21
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Granted: 1974-12-17
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Expires: 1993-05-21
Abstract
Abstract A welding additive for incorporation into electric-arc welding rod, e.g. of the coated or core type, contains chromium carbide with superstoichiometric quantities of carbon in the lattice of the chromium carbide to ensure a carbon content of 15 to 25 percent by weight. Preferably the additive is a low-melting hypereuctectoid of Cr3 C2 and elemental carbon. The additive improves the wear resistance and frictional characteristics of a deposit weld by imparting to its characteristics which have hitherto been associated only with high-carbon deposites of autogenous welding.
Inventors
- 👤 F Kilp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:58
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/327; B23K35/36; B23K35/3601
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
IN A WELDING ROD OR WIRE, AN IMPROVED WELD ADDITIVE FOR ELECTRIC-ARC DEPOSITION WELDING CONSISTING ESSENTIALLY OF THE STOICHIOMETRIC CHROMIUM CARBIDE CR3C2 WITH SUPERSTOICHIOMETRIC QUANTITIES OF ELEMENTAL CARBON DISTRIBUTED IN THE LATTICE OF THE CR3C2 TO ENSURE A CARBON CONTENT OF 15 TO 25 PERCENT BY WEIGHT IN THE ADDITIVE.
Claim 2
Dependent Claim
50 words
IN A WELDING ROD OR WIRE, AN IMPROVED WELD ADDITIVE FOR ELECTRIC-ARC DEPOSITION WELDING CONSISTING ESSENTIALLY OF THE STOICHIOMETRIC CHROMIUM CARBIDE CR3C2 WITH SUPERSTOICHIOMETRIC QUANTITIES OF ELEMENTAL CARBON DISTRIBUTED IN THE LATTICE OF THE CR3C2 TO ENSURE A CARBON CONTENT OF 15 TO 25 PERCENT BY WEIGHT IN THE ADDITIVE.
Claim 3
Dependent Claim
40 words
The additive defined in claim 1 wherein the elemental carbon forms a low-melting point euctectoid with a portion of the Cr3C2; the remainder of the Cr3C2 constituting hypereuctectoid chromium carbide dispersed as a microstructure in a matrix of the euctectoid.
Claim 4
Dependent Claim
14 words
The additive defined in claim 2 which has a carbon content of 19 percent.
References Cited (Backward Citations)
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US3617358A
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US3603763A
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US3592999A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |