US3961739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding metals using stress waves
Assignee: Grumman Corp
•
Filing: 1974-05-07
•
Granted: 1976-06-08
•
Expires: 1994-05-07
Abstract
Abstract Method for forming or deforming a metal workpiece by passing a stress wave through the metal workpiece sufficient to render it momentarily plastic. The apparatus is basically comprised of a stress wave focusing device or amplifier. In operation, a workpiece is placed in a die or shaping means. The stress wave amplifier is then arranged to direct or focus the stress wave to the metal workpiece. Next, a stress wave is generated and passed through the stress wave focusing device, imparting a momentary state of plasticity to the metal workpiece.
Inventors
- 👤 Basil P. Leftheris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:32
CPC Classifications
B; B21; B21J; B21J7/00; B21J7/20; B21J7/22; B21J7/30; B21D; B21D26/00; B21D26/14; B21J15/00; B21J15/10; B21J15/16; B21J15/24; B23; B23K; B23K20/00; B23K20/06; B23K20/10; H; H02; H02K; H02K33/00; H02K33/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49803; Y10T29/53; Y10T29/53709; Y10T29/5377; Y10T29/53774
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A method of spot welding two metallic workpieces of similar materials which are in contact with one another, comprising the steps of: electromagnetically generating a stress wave having a high particle velocity; conditioning the high velocity stress wave to increase its intensity and duration; applying the conditioned stress wave as a single pulse to one of the metallic workpieces; and providing sufficient energy density at the interface of the workpieces from the conditioned stress wave pulse to generate enough heat to weld the two metallic workpieces together.
Claim 2
Independent Claim
87 words
A method of spot welding two metallic workpieces of similar materials which are in contact with one another, comprising the steps of: electromagnetically generating a stress wave having a high particle velocity; conditioning the high velocity stress wave to increase its intensity and duration; applying the conditioned stress wave as a single pulse to one of the metallic workpieces; and providing sufficient energy density at the interface of the workpieces from the conditioned stress wave pulse to generate enough heat to weld the two metallic workpieces together.
Claim 3
Dependent Claim
28 words
A method of spot welding as claimed in claim 1, including the further step of: holding the metallic workpieces between a bucking mass and a stress wave conditioner.
Claim 4
Dependent Claim
30 words
A method of spot welding as claimed in claim 1, including the further step of: heating one of the metallic workpieces prior to application of the conditioned stress wave pulse.
References Cited (Backward Citations)
US3108325A
Cited
US3279228A
Cited
US3483611A
Cited
US3609851A
Cited
US3573781A
Cited
US3704506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |