US4756465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cold welding
Assignee: LATVIISKY GOSUDARSTVENNY INSTITUT USSR RIGA
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Filing: 1986-09-09
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Granted: 1988-07-12
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Expires: 2006-09-09
Abstract
Abstract A method of cold welding of workpieces formed as axially symmetric bodies of rotation, wherein the workpieces are pressed into each other by applying an axial stress to at least one of the workpieces, and the workpieces are imparted a relative turn in a plane perpendicular to the direction of the axial stress.
Inventors
- 👤 Anatoly S. Pranch
- 👤 Pavel I. Gursky
- 👤 Vasily I. Averkin
- 👤 Petr S. Neminuschy
- 👤 Vladimir N. Smirnov
- 👤 Evgeny A. Baranov
- 👤 Dmitry V. Leontiev
- 👤 Jury I. Goroshkov
- 👤 Vladimir N. Lozinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:23
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/12; B23K20/129; B23K2101/00; B23K2101/04; B23K2103/00; B23K2103/08; B23K2103/10; B23K2103/12; B23K2103/18; B23K2103/20; H; H01; H01R; H01R4/00; H01R4/58; H01R4/62; H01R4/625
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A method of cold welding of workpieces formed as axially symmetric bodies of rotation, said method comprising: pressing two workpieces having end faces tapering at different angles, the difference between the taper angles being slightly greater than zero degrees, said two workpieces being pressed into overlapping engagement with each other by applying an axial stress to at least one of said workpieces and relatively rotating the workpieces to be welded through a rotation of less than one revolution about an axis of rotation extending in the direction of the axial stress to produce shear-loaded cold welded bridges between the workpieces which avoid destruction due to residual stresses.
Claim 2
Independent Claim
107 words
A method of cold welding of workpieces formed as axially symmetric bodies of rotation, said method comprising: pressing two workpieces having end faces tapering at different angles, the difference between the taper angles being slightly greater than zero degrees, said two workpieces being pressed into overlapping engagement with each other by applying an axial stress to at least one of said workpieces and relatively rotating the workpieces to be welded through a rotation of less than one revolution about an axis of rotation extending in the direction of the axial stress to produce shear-loaded cold welded bridges between the workpieces which avoid destruction due to residual stresses.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, wherein the angle between said faces of the workpieces to be welded is less than 90°.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2, wherein the angle between said faces of the workpieces to be welded is less than 5°.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 3, wherein the relative rotation of the workpieces is effected along a helix about an axis which coincides with the direction of the axial stress.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1, wherein said axial stress is applied progressively.
Claim 7
Dependent Claim
18 words
A method as claimed in claim 1, wherein said relative rotation is less than about 45° of arc.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 4, wherein the helix is defined by cooperating screw threads formed in each of the workpieces.
Claim 9
Dependent Claim
13 words
A method as claimed in claim 3, wherein the workpieces are metallic materials.
Claim 10
Dependent Claim
15 words
A method as claimed in claim 8, wherein the workpieces are each different metallic materials.
Claim 11
Independent Claim
162 words
A method of cold welding of metallic workpieces formed as axially symmetric bodies of rotation, said method comprising: (a) placing a pair of metallic workpieces in surface contact, said workpieces having end faces tapering at different angles, the difference between the taper angles being slightly greater than zero degrees; (b) aligning the axes of said workpieces to be coaxial; (c) applying an axial stress to at least one of said workpieces to cause said workpieces to contact each other at said respective tapering faces; and (d) relatively rotating the workpieces less than one revolution about an axis of rotation extending in the direction of the axial stress while maintaining said axial stress to destroy a surface film of at least one of said workpieces at an area of contact with the other of said workpieces with the concurrent formation of a shear-loaded cold welded lap joint between the workpieces at the area of contact therebetween which avoids destruction due to residual stresses.
Claim 12
Independent Claim
162 words
A method of cold welding of metallic workpieces formed as axially symmetric bodies of rotation, said method comprising: (a) placing a pair of metallic workpieces in surface contact, said workpieces having end faces tapering at different angles, the difference between the taper angles being slightly greater than zero degrees; (b) aligning the axes of said workpieces to be coaxial; (c) applying an axial stress to at least one of said workpieces to cause said workpieces to contact each other at said respective tapering faces; and (d) relatively rotating the workpieces less than one revolution about an axis of rotation extending in the direction of the axial stress while maintaining said axial stress to destroy a surface film of at least one of said workpieces at an area of contact with the other of said workpieces with the concurrent formation of a shear-loaded cold welded lap joint between the workpieces at the area of contact therebetween which avoids destruction due to residual stresses.
Claim 13
Dependent Claim
18 words
A method as claimed in claim 10, wherein each of said workpieces is formed from a different metal.
Claim 14
Dependent Claim
56 words
A method as claimed in claim 10 including the further step of forming conical cooperating surfaces at respective ends of said workpieces to be welded together, said conical surfaces each having different angles of inclination relative to a common axis, the difference between the angles of inclination being greater than 0° and less than about 5°.
Claim 15
Dependent Claim
56 words
A method as claimed in claim 12 including the further step of forming conical cooperating surfaces at respective ends of said workpieces to be welded together, said conical surfaces each having different angles of inclination relative to a common axis, the difference between the angles of inclination being greater than 0° and less than about 5°.
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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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |