US3768147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of friction welding
Assignee: General Electric Co
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Filing: 1971-12-20
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Granted: 1973-10-30
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Expires: 1991-12-20
Abstract
Abstract A friction welded metallic article such as a fluid directing element for turbomachinery apparatus has a cast airfoil and a wrought base joined by friction welding. One such article having a hollow interior portion is made from a hollow or cored casting and a wrought base member. There is provided a metal airfoil casting having a hollow interior portion and an enlarged foot including an interface portion. Also provided is a wrought metal base portion including an interface portion. Interface surfaces of the interface portions are placed in spaced apart opposed relationship and then the airfoil casting and the wrought base member are friction welded at their interface portions.
Inventors
- 👤 T Berry
- 👤 R Rajala
- 👤 H Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:12
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
In a method for making a fluid directing element for turbomachinery, the element having a cast metal airfoil and a wrought metal base, the steps of: providing a cast metal airfoil preform including an enlarged foot havinG an interface portion and an interface surface; providing a wrought metal base portion including an interface portion having an interface surface; positioning the interface surfaces of the cast airfoil preform and the wrought base portion in spaced, opposed relationship; and then friction welding the cast airfoil preform and the wrought base portion at their interface portions.
Claim 2
Dependent Claim
93 words
In a method for making a fluid directing element for turbomachinery, the element having a cast metal airfoil and a wrought metal base, the steps of: providing a cast metal airfoil preform including an enlarged foot havinG an interface portion and an interface surface; providing a wrought metal base portion including an interface portion having an interface surface; positioning the interface surfaces of the cast airfoil preform and the wrought base portion in spaced, opposed relationship; and then friction welding the cast airfoil preform and the wrought base portion at their interface portions.
Claim 3
Dependent Claim
36 words
In a method as in claim 1 in which the airfoil preform and the base portion are of high temperature operating superalloys based on an element selected from the group consisting of Ni, Co and Fe.
Claim 4
Dependent Claim
17 words
In a method as in claim 1, in which the airfoil preform has a hollow interior portion.
Claim 5
Dependent Claim
24 words
In a method as in claim 3, in which a liner insert is placed within the airfoil hollow interior portion prior to friction welding.
Claim 6
Dependent Claim
162 words
In a method as in claim 3, in which the hollow interior portion is open through a passage between hollow interior portion and the foot interface surface, the additional steps prior to friction welding of: providing in the airfoil preform interface portion a recess around and connected with the passage, larger than the passage and partially but not completely through the interface portion; the recess including the bottom shelf surrounding the passage in the interface portion and disposed in respect to a wall of the passage at the shelf at an angle no greater than about 90*; providing a plug having a shank and a head attached to the shank and enlarged in respect to the shank; the head including a top surface and otherwise shaped to match the recess; and the shank shaped to match the passage so that the plug seats within the recess and a portion of the passage with the head top surface flush with the interface surface.
References Cited (Backward Citations)
US2807435A
Cited
US3421201A
Cited
US3394918A
Cited
US3485143A
Cited
US3549273A
Cited
US3576681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |