US4003513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive welding
Assignee: Rolls Royce Power Engineering PLC
•
Filing: 1975-08-25
•
Granted: 1977-01-18
•
Expires: 1995-08-25
Abstract
Abstract In a method of explosively welding a metal pipe into a bore in another metal member, such as tube plate or another pipe, the explosive charge is surrounded by a body of impacting medium which is spaced from the inner surface of the pipe wall so that upon detonation of the explosive the impacting medium reaches a high velocity, without disintegrating, before it strikes the pipe wall to effect expansion thereof.
Inventors
- 👤 International Research And Development Company Limited
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21D39/066; B21D39/04; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K20/085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
A method of explosively welding a metal pipe to a metal member having a bore to receive said pipe comprising the steps of i. disposing said pipe in said bore with a clearance between the outer surface of the said pipe and the wall of said bore, ii. locating within said pipe an impactor comprising a body of impacting medium containing an explosive charge, the surface of said body at least in the region surrounding the explosive charge being spaced from the inner surface of the pipe, and iii. detonating the explosive charge and thereby iv. imparting a high velocity to the impacting medium before it strikes the inner surface of the pipe, v. the impact of said impacting medium on the pipe accelerating the wall of the pipe to a velocity such that it is welded to the wall of the said bore.
Claim 2
Independent Claim
144 words
A method of explosively welding a metal pipe to a metal member having a bore to receive said pipe comprising the steps of i. disposing said pipe in said bore with a clearance between the outer surface of the said pipe and the wall of said bore, ii. locating within said pipe an impactor comprising a body of impacting medium containing an explosive charge, the surface of said body at least in the region surrounding the explosive charge being spaced from the inner surface of the pipe, and iii. detonating the explosive charge and thereby iv. imparting a high velocity to the impacting medium before it strikes the inner surface of the pipe, v. the impact of said impacting medium on the pipe accelerating the wall of the pipe to a velocity such that it is welded to the wall of the said bore.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1 wherein said impactor body is conically tapered in the region surrounding said explosive charge.
Claim 4
Dependent Claim
29 words
A method as claimed in claim 2 wherein said impactor body is spaced from the inner surface of the pipe by at least one annular projection on the body.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 2 including the step of fitting a cylindrical portion of said impactor body within said pipe.
Claim 6
Dependent Claim
39 words
A method as claimed in claim 1 for welding the ends of two pipes to a surrounding sleeve, including the step of disposing a metal shielding member between said pipe ends to prevent extrusion of the impacting medium therebetween.
Claim 7
Dependent Claim
48 words
A method as claimed in claim 1 for welding the ends of two pipes to a surrounding sleeve in which an explosive charge is disposed within each end of said impactor body and each of said ends is conically tapered from a cylindrical centre section of larger diameter.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 6 wherein said impactor body is formed with an annular recess at its centre in alignment with the gap between the ends of the pipes.
Claim 9
Dependent Claim
32 words
A method as claimed in claim 6 wherein a metal shielding ring is disposed between said pipe ends to prevent extrusion of the impacting medium through the gap between the pipe ends.
Claim 10
Dependent Claim
15 words
A method as claimed in claim 2 in which the explosive charge is conically tapered.
Claim 11
Dependent Claim
17 words
A method as claimed in claim 1 in which the explosive charge has a supersonic detonation velocity.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |