High-wave impedance self-restraint explosive welding method and device for dissimilar metal composite pipe

An explosive welding, dissimilar metal technology, applied in metal processing, welding equipment, metal processing equipment and other directions, can solve the problems of poor adhesion between the coating and the steel substrate, deformation of the composite pipe, poor corrosion resistance, etc., to achieve high collision speed, The effect of improving straightness and avoiding direct damage

Pending Publication Date: 2022-06-07
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in physical properties between the base pipe and the inner pipe, some coatings prepared by various coating technologies have poor adhesion to the steel substrate, and are prone to cracking and poor corrosion resistance after welding.
Moreover, the traditional explosive welding process is likely to cause serious deformation or even fracture of the composite pipe

Method used

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  • High-wave impedance self-restraint explosive welding method and device for dissimilar metal composite pipe
  • High-wave impedance self-restraint explosive welding method and device for dissimilar metal composite pipe
  • High-wave impedance self-restraint explosive welding method and device for dissimilar metal composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] The outer tube is made of mild steel with an inner diameter of 65mm, a wall thickness of 10mm and a length of 200mm. The inner tube is made of industrial grade copper and has an inner diameter of 56mm, a wall thickness of 2mm and a length of 200mm. Gap size according to SOD=K SOD2 *(R5-R3) is taken as 2.5mm, and the inner diameter and outer diameter of the pipe are selected according to this standard.

[0115] The protective tube 5 is omitted when the required thickness of the inner tube coating is greater than 1 mm.

[0116] Because the wall thickness of the outer pipe is greater than 2mm, the outer mold selects a steel pipe with a wall thickness of 10mm as the mold. The outer constraining layer 9 is filled between the outer mold 10 and the outer tube 8 using water, and is sealed and fixed at both ends in the axial direction. Since the wall thicknesses of the outer tube 8 and the outer mold 10 are both 10 mm, the outer restraining charge 11 is omitted, avoiding unne...

Embodiment 2

[0122] The outer tube 8 is made of mild steel with an inner diameter of 64 mm, a wall thickness of 10 mm and a length of 200 mm. The inner tube 6 is made of helically wound copper foil with a width of 10 mm and a thickness of 2 mm.

[0123] Due to the high cost of preparing thin copper tubes with a wall thickness of 0.2 mm. Therefore, scheme 2 is adopted: a long copper sheet with a width of 10 mm and a thickness of 2 mm is used, and the copper sheet is spirally wound and bonded to the protection tube 5 through the bonding material PET double-sided tape. The protection tube 5 is a copper tube with an outer diameter of 60 and a wall thickness of 2. That is, the inner tube 6 is made of helically wound thin copper sheets by bonding. Since the high-speed impact in the explosive welding process can achieve metallurgical bonding between the materials, the spirally wound copper sheet 6 can achieve a continuous and integrated tube inner cladding after being pushed outward by the prot...

Embodiment 3

[0130] The outer tube is made of aluminium with an inner diameter of 65 mm, a wall thickness of 10 mm and a length of 200 mm. The inner tube is made of copper with an inner diameter of 56 mm, a wall thickness of 2 mm and a length of 200 mm. Gap size according to SOD=K SOD2 *(R5-R3) is taken as 2.5mm, and the inner diameter and outer diameter of the pipe are selected according to this standard.

[0131] The protective tube 5 is omitted when the required thickness of the inner tube coating is greater than 1 mm.

[0132] Because the wall thickness of the outer pipe is greater than 2mm, the outer mold selects a steel pipe with a wall thickness of 10mm as the mold. The outer restraint layer 9 is filled between the outer mold 10 and the outer tube 8 using water, and is sealed and fixed at both ends in the axial direction.

[0133] The explosive welding explosive 2 contained in the interior is a mixture of emulsion explosive and hollow glass microspheres (mass ratio is 3:1). The ...

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Abstract

The invention discloses a high-wave impedance self-restraint explosive welding method and device for a dissimilar metal composite pipe. The device is sequentially and concentrically provided with selectable outer constraint explosive, an outer mold, a selectable outer constraint layer, an outer pipe, an inter-pipe gap, an inner pipe, a selectable protection pipe, a pressure transmitting medium, a charging pipe, explosive welding explosive and a detonator from outside to inside. In the inter-pipe gap between the outer pipe and the inner pipe, the supporting and sealing structures are fixed at the two ends of the inter-pipe gap, so that the gap is kept uniform and sealed; wherein the external base body structure comprises an outer mold, an outer restraint layer and an outer pipe; the internal coating structure comprises an inner tube and a protective tube; the explosive welding cartridge comprises a charging tube and explosive welding explosive. By means of the method and device, distortion of the explosive welding pipe can be restrained, the straightness of the composite pipe can be improved, collision damage between an outer pipe and an outer mold is reduced, the adjustable and controllable range of welding parameters is widened, the risk of crack generation is greatly reduced, and the gap distance between all structures is accurately limited.

Description

technical field [0001] The invention belongs to the technical field of explosive welding, and in particular relates to a high-wave impedance self-restrained explosive welding method and device for dissimilar metal composite pipes. Background technique [0002] In recent years, composite pipes have developed rapidly in the fields of petroleum, aviation, military, and nuclear industries. With the massive depletion of oil resources and the depletion of large conventional oil and gas fields, oil and gas fields are facing harsh environmental conditions. Conventional energy is being replaced by nuclear energy, and these environments are often accompanied by high corrosiveness. In addition, the utilization of nuclear energy makes the long-term management of nuclear waste an important research topic. One current solution to nuclear waste is to bury spent nuclear fuel deep underground for storage. Reactor fuel bundles are packaged in used fuel containers and copper / carbon steel co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/08B23K20/26B23K101/06
CPCB23K20/085B23K20/26B23K2101/06Y02E30/30
Inventor 赵阳王文宇任智强梁莉徐钧童伟滕涛王晓明韩国峰马宏昊沈兆武田启超
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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