Patent US4669649A successfully refreshed from Google Patents.
US4669649A
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US
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Joint between two preferably metallic pipes and method of producing said joint
Assignee: Volvo AB
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Filing: 1985-11-21
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Granted: 1987-06-02
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Expires: 2005-11-21
Abstract
Abstract Sealing and cracking problems occur when joining coarse-caliber pipes (1 and 2) for oil or gas, for instance, by means of welding. The problem is solved by using an outer peripheral part (3) and an inner peripheral part (4) at the joint, and applying the latter part (4) by means of explosive welding. At the same time, the outer peripheral part (3) forms a firm joint, due to the action of the explosive welding.
Inventors
- 👤 Bengt Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:11
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/147; B; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K20/085; B23P; B23P11/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
151 words
A compound joint for joining together the abutting ends of two pipes, said joint comprising an outer peripheral part forming a mechanical joint between said pipes, and an inner peripheral part forming a welded joint between said pipes, wherein said welded joint is formed by internally explosion welding said inner peripheral part, and said mechanical joint is formed simultaneously with said welded joint by application of the explosive force of said explosion welding in the radial direction to said outer peripheral part, said outer peripheral part being displacable in the radial direction due to deformation caused by the explosive force, and wherein said outer peripheral part, said inner peripheral part, and an explosive charge internal to said inner peripheral part for causing said explosion welding are formed prior to said explosion welding as a single unit in which said inner part is fixed relative to said outer part by connecting rods.
Claim 2
Dependent Claim
151 words
A compound joint for joining together the abutting ends of two pipes, said joint comprising an outer peripheral part forming a mechanical joint between said pipes, and an inner peripheral part forming a welded joint between said pipes, wherein said welded joint is formed by internally explosion welding said inner peripheral part, and said mechanical joint is formed simultaneously with said welded joint by application of the explosive force of said explosion welding in the radial direction to said outer peripheral part, said outer peripheral part being displacable in the radial direction due to deformation caused by the explosive force, and wherein said outer peripheral part, said inner peripheral part, and an explosive charge internal to said inner peripheral part for causing said explosion welding are formed prior to said explosion welding as a single unit in which said inner part is fixed relative to said outer part by connecting rods.
Claim 3
Dependent Claim
10 words
Joint according to claim 1, wherein said pipes comprise metal.
Claim 4
Dependent Claim
18 words
Joint according to claim 1, wherein said inner peripheral part comprises metal in the vicinity of said joint.
Claim 5
Dependent Claim
18 words
Joint according to claim 1, wherein said outer peripheral part comprises metal in the vicinity of said joint.
Claim 6
Dependent Claim
23 words
Joint according to claim 1, wherein said outer peripheral part comprises a tube having substantially the same wall thickness along its entire length.
Claim 7
Dependent Claim
151 words
Method of producing a compound joint between the abutting ends of two pipes, comprising the steps of: (a) placing partially within the end of one of said pipes, a tubular inner peripheral part having an explosive charge internal to said inner peripheral part; (b) placing partially over the end of one of said pipes a tubular outer peripheral part; (c) abutting the ends of said pipes such that the abutted ends are between said inner and outer peripheral parts; and (d) detonating said explosive charge to weld said inner part to said abutted ends and to cause said abutted ends and said outer part to be displaced outwardly, thereby forming a mechanical joint simultaneously with said weld, wherein said outer peripheral part, said inner peripheral part, and said explosive charge are formed as a single unit, in which said inner part is fixed relative to said outer part by connecting rods.
Claim 8
Dependent Claim
151 words
Method of producing a compound joint between the abutting ends of two pipes, comprising the steps of: (a) placing partially within the end of one of said pipes, a tubular inner peripheral part having an explosive charge internal to said inner peripheral part; (b) placing partially over the end of one of said pipes a tubular outer peripheral part; (c) abutting the ends of said pipes such that the abutted ends are between said inner and outer peripheral parts; and (d) detonating said explosive charge to weld said inner part to said abutted ends and to cause said abutted ends and said outer part to be displaced outwardly, thereby forming a mechanical joint simultaneously with said weld, wherein said outer peripheral part, said inner peripheral part, and said explosive charge are formed as a single unit, in which said inner part is fixed relative to said outer part by connecting rods.
Claim 9
Dependent Claim
33 words
Method according to claim 6, wherein said inner peripheral part comprises an annular member with a generally triangular axial cross-section, the apex of said triangular cross-section disposed radially outwardly toward said abutting ends.
Claim 10
Dependent Claim
43 words
Method according to claim 6, wherein the distance between the outer surface of said inner peripheral part and the inner surface of said pipes may be varied according to the wall thickness of said inner peripheral part, the distance increasing with increased thickness.
Claim 11
Dependent Claim
13 words
Method according to claim 6, wherein said explosive charge comprises a tubular form.
Claim 12
Dependent Claim
27 words
Method according to claim 9, wherein said explosive charge comprises at least three concentric tubular layers, in which at least one intermediate layer comprises a non-detonating material.
Claim 13
Dependent Claim
23 words
Method according to claim 10, wherein said non-detonating material is selected from the group consisting of cardboard, wood fiber, rubber, salt, and wood.
Claim 14
Dependent Claim
45 words
Method according to claim 10, wherein said explosive charge comprises an explosive material located in a plane perpendicular to the axis of said charge and substantially equidistant to the ends of said charge, and a detonator which is located in the center of the plane.
Claim 15
Dependent Claim
14 words
Method according to claim 12, wherein said explosive material comprises a disc or strings.
Claim 16
Dependent Claim
34 words
Method according to claim 6, wherein prior to sajid detonation, an additional layer is applied between the inner surface of said outer peripheral part and the outer surface of said pipes to be joined.
Claim 17
Dependent Claim
21 words
Method according to claim 14, wherein said layer is selected from the group consisting of plastic, metal, rubber, or flexible material.
Claim 18
Dependent Claim
40 words
Method according to claim 6, additionally comprising the steps of: (a) placing a rigid peripheral ring over said tubular outer peripheral part, prior to detonating said explosive; and (b) removing said rigid peripheral ring subsequent to detonating said explosive charge.
Claim 19
Dependent Claim
20 words
Method according to claim 16, wherein said rigid peripheral ring comprises two semicircular ring halves having a hinged joint therebetween.
Claim 20
Dependent Claim
20 words
Method according to claim 6, wherein the vicinity of said abutted ends is evacuated prior to the step of detonating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |