US3670140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joining of tubes to tube plates
Assignee: Foster Wheeler John Brown Boilers Ltd
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Filing: 1970-02-24
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Granted: 1972-06-13
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Expires: 1990-02-24
Abstract
Abstract This invention relates to the joining of tubes to tube sheets in alignment with bores through the latter. These bores are slightly larger in diameter than the outside diameters of the tubes. An annular filler insert is positioned adjacent the end of the bore in engagement with the end of the tube. When a non-consumable electrode arc weld is made, the insert melts and becomes united with the end of the tube and the tube sheet, the shape and size of the insert being such that the resulting join has a smooth crevice-free contour, between the tube and the tube sheet.
Inventors
- 👤 Daniel Frank Thomas Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:11
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0255; B23K33/00; B23K33/004; B23K9/00; B23K9/02; B23K9/0203; B23K9/028; B23K9/0288; F; F16; F16L; F16L41/00; F16L41/08; F16L41/082; F16L41/084; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A method of making a welded joint between a cylindrical tube having a frusto conical outer surface at one end and a tube sheet or header comprising the steps of: a. providing a tube sheet with a bore having a diameter slightly larger than the outside of said tube, b. positioning an annular filler insert having a frusto conical inner surface adjacent one end of said bore, and placing said one end of said tube to be joined to said sheet in engagement with said filler insert, said insert having a cross-section such that it will fuse during the making of a weld and will become united with said end of said tube and with said tube sheet to give a smooth crevice-free weld contour between said tube and said tube sheet, and c. making a circumferential weld from within said bore with an inert gas shielded non-consumable electrode electric arc welder which fuses said insert and unites it with said end of said tube and with said tube sheet giving a smooth crevice free weld contour between said tube and said tube sheet.
Claim 2
Independent Claim
184 words
A method of making a welded joint between a cylindrical tube having a frusto conical outer surface at one end and a tube sheet or header comprising the steps of: a. providing a tube sheet with a bore having a diameter slightly larger than the outside of said tube, b. positioning an annular filler insert having a frusto conical inner surface adjacent one end of said bore, and placing said one end of said tube to be joined to said sheet in engagement with said filler insert, said insert having a cross-section such that it will fuse during the making of a weld and will become united with said end of said tube and with said tube sheet to give a smooth crevice-free weld contour between said tube and said tube sheet, and c. making a circumferential weld from within said bore with an inert gas shielded non-consumable electrode electric arc welder which fuses said insert and unites it with said end of said tube and with said tube sheet giving a smooth crevice free weld contour between said tube and said tube sheet.
Claim 3
Dependent Claim
31 words
A method according to claim 1 in which the composition of the filler insert is chosen so to avoid hot cracking of said join during welding and embrittlement of said join.
Claim 4
Dependent Claim
30 words
A method according to claim 1 further comprising the step of providing a controlled atmosphere around the outside of said filler insert and said end of said tube during welding.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |