US3576067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction welding irregularly shaped objects
Assignee: Caterpillar Inc
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Filing: 1968-02-28
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Granted: 1971-04-27
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Expires: 1988-02-28
Abstract
Abstract Friction welding irregular-shaped workpieces by providing a minimal contact area on one of the workpieces and intentionally applying excess energy and pressure to the weld zone to produce excess flash material.
Inventors
- 👤 Calvin D Loyd
- 👤 Ralph W Yocum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:51
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/12; B23K20/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A method of friction welding a twist drill having an irregular cross section to a shank member having a larger diameter than the twist drill comprising: forming a counterbore in the shank member for receiving one end of the twist drill; rotating the shank member relative to the twist drill; engaging the relatively rotating twist drill and the counterbored portion of the shank member in rubbing contact; intentionally using excess weld energy and excess welding and forging pressure to forge excess material and oxides out of the weld interface to produce an excess amount of flash material in an amount sufficient to cause the counterbore in the shank member to form the excess flash material in a round ring and to force the flash material inwardly to fill up the exposed areas of the irregular-shaped twist drill and prevent oxidation.
Claim 2
Independent Claim
140 words
A method of friction welding a twist drill having an irregular cross section to a shank member having a larger diameter than the twist drill comprising: forming a counterbore in the shank member for receiving one end of the twist drill; rotating the shank member relative to the twist drill; engaging the relatively rotating twist drill and the counterbored portion of the shank member in rubbing contact; intentionally using excess weld energy and excess welding and forging pressure to forge excess material and oxides out of the weld interface to produce an excess amount of flash material in an amount sufficient to cause the counterbore in the shank member to form the excess flash material in a round ring and to force the flash material inwardly to fill up the exposed areas of the irregular-shaped twist drill and prevent oxidation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |