US3798748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion welding
Assignee: National Aeronautics and Space Administration
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Filing: 1972-09-29
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Granted: 1974-03-26
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Expires: 1992-09-29
Abstract
Abstract Dispersion-strengthened nickel alloys are sanded on one side and chemically polished. This is followed by a single-step welding process wherein the polished surfaces are forced into intimate contact at 1,400* F for one hour in a vacuum. Diffusion, recrystallization, and grain growth across the original weld interface are obtained during postheating at 2,150* F for two hours in hydrogen.
Inventors
- 👤 K Holko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
A method of solid-state welding as claimed in claim 1 wherein the members are of a nickel alloy selected from a group consisting of Ni-Th02, Ni-Cr-Th02, Ni-Mo-Th02, and Ni-Cr-Al-ThO2.
Claim 2
Dependent Claim
29 words
A method of solid-state welding as claimed in claim 2 wherein at least one of the members is of a dispersion-strengthened nickel alloy that is unrecrystallized prior to heating.
Claim 3
Dependent Claim
24 words
A method of solid state welding as claimed in claim 1 wherein the applied pressure is between about 20,000 psi and about 40,000 psi.
Claim 4
Dependent Claim
18 words
A method of solid state welding as claimed in claim 4 wherein the members are postheated in hydrogen.
Claim 5
Dependent Claim
26 words
A method of solid-state welding as claimed in claim 1 wherein both members are unrecrystallized prior to welding and a pressure of 20,000 psi is applied.
Claim 6
Dependent Claim
34 words
A method of solid-state welding as claimed in claim 1 wherein one of the members is uncrystallized and the other member is recrystallized prior to welding and a pressure of 30,000 psi is applied.
Claim 7
Dependent Claim
26 words
A method of solid-state welding as claimed in claim 1 wherein both members are recrystallized prior to welding and a pressure of 20,000 psi is applied.
References Cited (Backward Citations)
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US3646591A
Cited
US3672037A
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US3530568A
Cited
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Cited
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Cited
US3714702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |