Patent US3703032A successfully refreshed from Google Patents.
US3703032A
Expired / Lapsed
US
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Diffusion bonding process
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-08-14
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Granted: 1972-11-21
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Expires: 1990-08-14
Abstract
Abstract A diffusion bonding process may be performed by heating a joint of two metal tubes in tight restriction. The difference in the coefficient of thermal expansion between the metal tubes and a retaining sleeve and wedge causes radial pressure which diffusion bonds the tubes at the joint.
Inventors
- 👤 Roy I Batista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:54
CPC Classifications
B; B23; B23K; B23K20/00; B23Q; B23Q3/00; B23Q3/02; B23Q3/06; B23Q3/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A diffusion bonding process for metal tubing comprising: a. two metal tubes having the surfaces to be joined machined so that the outside diameter of one is equal to the inside diameter of the other; b. joining the ends of the tubing; c. placing the tubing joint in a hollow cylindrical strength member having the inner surface tapered; d. inserting a split cylindrical wedge having the outer surface tapered to be received by said strength member thereby firmly enclosing the joint; and e. heating the assembly to a temperature below the melting temperature of the metal to affect bonding of the tubes.
Claim 2
Dependent Claim
102 words
A diffusion bonding process for metal tubing comprising: a. two metal tubes having the surfaces to be joined machined so that the outside diameter of one is equal to the inside diameter of the other; b. joining the ends of the tubing; c. placing the tubing joint in a hollow cylindrical strength member having the inner surface tapered; d. inserting a split cylindrical wedge having the outer surface tapered to be received by said strength member thereby firmly enclosing the joint; and e. heating the assembly to a temperature below the melting temperature of the metal to affect bonding of the tubes.
Claim 3
Dependent Claim
102 words
A diffusion bonding process for metal tubing comprising: a. two metal tubes having the surfaces to be joined machined so that the outside diameter of one is equal to the inside diameter of the other; b. joining the ends of the tubing; c. placing the tubing joint in a hollow cylindrical strength member having the inner surface tapered; d. inserting a split cylindrical wedge having the outer surface tapered to be received by said strength member thereby firmly enclosing the joint; and e. heating the assembly to a temperature below the melting temperature of the metal to affect bonding of the tubes.
Claim 4
Dependent Claim
102 words
A diffusion bonding process for metal tubing comprising: a. two metal tubes having the surfaces to be joined machined so that the outside diameter of one is equal to the inside diameter of the other; b. joining the ends of the tubing; c. placing the tubing joint in a hollow cylindrical strength member having the inner surface tapered; d. inserting a split cylindrical wedge having the outer surface tapered to be received by said strength member thereby firmly enclosing the joint; and e. heating the assembly to a temperature below the melting temperature of the metal to affect bonding of the tubes.
Claim 5
Dependent Claim
15 words
A process according to claim 1 wherein the metal tubes are made from dissimilar metals.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein an intermetallic compound inhibitor is applied to the tube surfaces to be joined.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein a diffusion aid is applied to the tube surfaces to be joined.
Claim 8
Dependent Claim
25 words
A process according to claim 1 wherein a mandrel having a high coefficient of thermal expansion is inserted inside the metal tubes to be joined.
References Cited (Backward Citations)
US1840724A
Cited
US2850798A
Cited
US3184362A
Cited
US3352004A
Cited
US3535767A
Cited
US3550254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |