| 摘要 |
1,160,407. High energy jointing; jointing by tube expanding. ATOMIC ENERGY OF CANADA Ltd. 25 Aug., 1967 [9 Nov., 1966], No. 39266/67. Heading B3Q and B3W. [Also in Division F2] A method of forming a joint between a tube 3 of low-ductility material subject to brittleness subsequent to plastic distortion, e.g. Zr-Nb alloy, and a fitting 1, e.g. of stainless-steel, comprises removing material from the fitting to provide an interface area with a chosen profile 4, locating a reinforcing ring 5 against the tube and distorting the ring and tube into the interface area by a rapidly developing force, the quantity of material removed from the fitting in providing the interface area being sufficient to accommodate distorted material of the tube and ring. The ring and tube may be deformed by a high pressure impulse transmitted in water, e.g. by firing an explosive 9 in water 16 supported by a disc 15 ejected by the explosion. The ring 5, which is a press-fit in the tube, has a lower flange 6 and an upper bevel 18, and the fitting is restrained in a die 2. After deformation, Fig. 2 (not shown), the bore of the ring is not less than that of the tube and may be finished by rolling. As applied to contracting a tube 21, Fig. 3, and its reinforcing ring 25 against a fitting 22, a strip 28 of explosive is used forming a water chamber closed at one end by a ring 30. The strip is detonated on one edge simultaneously around the circumference 31 by a triangular line wave generator. During the explosive forming, the ring 25 is sheared from an extension 32 at a weakening groove 26 and contracted to the diameter of the tube, Fig. 4 (not shown). |
