Magnetic pulse connecting method and joint structure for thin-wall metal pipelines

A connection method and joint structure technology, which is applied in the field of connecting thin-walled metal pipelines with pulsed magnetic pressure loads, can solve the problems of difficulty in obtaining high-strength and high-corrosion-resistant joints, high production costs, and large stress gradients. Improved processing flexibility, high strength and corrosion resistance, high tensile strength and high torsional strength

Inactive Publication Date: 2010-12-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because brittle intermetallic compounds tend to appear on the connection interface and produce a large stress gradient, it is difficult to obtain high-strength and high-corrosion-resistant connections by methods such as diffusion welding, explosive welding, rolling connection and friction welding. Joints, thus limiting the application of these dissimilar metal joints in fields such as weaponry, aerospace and automobile manufacturing
Although advanced laser welding and electron beam welding technologies can weld dissimilar metal materials under certain material matching, these two technologies have very high requirements on the connection joint structure, pre-welding treatment and clamping conditions, and at the same time, the difference in production cost High also prohibits most possible applications

Method used

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  • Magnetic pulse connecting method and joint structure for thin-wall metal pipelines
  • Magnetic pulse connecting method and joint structure for thin-wall metal pipelines
  • Magnetic pulse connecting method and joint structure for thin-wall metal pipelines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The tube-tube magnetic pulse connection method of the coil as the inductor:

[0042] The 3A21 tube of φ20×1.0mm is connected with the 20 steel pipe of φ16×2.0mm. The electromagnetic pulse forming equipment has a capacitance of 720μF, a discharge voltage of 5.5kV, a number of coil turns of 5, an inner diameter of 21mm, and a copper wire cross section of 5×7mm. The magnetic pulse connection process of the above-mentioned two material pipes is realized, and a welded joint with a wave interface and significant interface element diffusion is obtained. Magnetic pulse connection device such as figure 1 , The specific implementation process is as follows:

[0043] Step 1: Perform rust removal, degreasing and degreasing treatments on the corresponding surfaces of the overlapping area of ​​the connecting pipe fitting 3 and the connected pipe fitting 2 of the length L to make them present a smooth metal interface.

[0044] Step 2: Place the connecting pipe 3 and the connected pipe 2 coa...

Embodiment 2

[0048] Coil-magnetic collector as the tube-tube magnetic pulse connection method of the composite inductor:

[0049] The 3A21 tube of φ32×1.0mm is connected with the 20 steel tube of φ28×2.5mm. The electromagnetic pulse forming equipment has a capacitance of 720μF and a discharge voltage of 6.5kV; the number of coil turns is 17, the inner diameter is 91mm, the cross section of the wire is 3×5mm, and the axial length is 100mm. ; The outer diameter of the magnetic collector is 91mm, the inner diameter is 33mm, the outer wall length is 100mm, the working area is 10mm long, and the longitudinal slit width is 0.5mm. The electromagnetic pulse connection process of the above-mentioned two material pipes is realized, and a welded joint with a wave interface is obtained. Magnetic pulse connection device such as figure 2 with image 3 . The specific implementation process is as follows:

[0050] Step 1: Perform rust removal, degreasing, and degreasing treatment on the corresponding surfac...

Embodiment 3

[0055] Tube-tube magnetic pulse connection method with driver:

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Abstract

The invention discloses a magnetic pulse connecting method and a joint structure for thin-wall metal pipelines and provides a safe and high-efficiency magnetic pulse connecting method and a magnetic pulse connecting joint structure for similar and dissimilar thin-wall metal pipelines. A coil-magnetic concentrator composite inductor or a coil inductor is connected with electromagnetic pulse forming equipment so that the pipelines of various metal materials or various structure shapes can be connected in a magnetic pulse way. The transition area of the joint connecting interface is small, the brittle phase or intermetallic compound almost cannot be generated, and the joint almost has no heat affected area and torsion deformation and has high strength and corrosion-resistance property; the tension strength and torsion strength of the joint are respectively higher than those of weak base metal; the subsequent cleaning procedure and post-weld heat treatment are not needed; and the connected pipeline satisfies certain rigidity requirement, cannot be subjected to the plastic deformation in the magnetic pulse connecting process and has high process flexibility.

Description

Technical field [0001] The invention relates to a metal pipeline connection technology, in particular to a method for connecting thin-walled metal pipelines by applying pulse magnetic pressure load. Background technique [0002] Any kind of metal pipeline structure, whether it is a water supply pipeline in daily life or various pipeline structures in aerospace aircraft, must involve the connection joint structure and the selection of the connection method. Generally, the joints of pipeline connections are the most vulnerable link in the entire pipeline system. [0003] With the improvement of people's quality of life, the application of resource-saving and environment-friendly thin-walled stainless steel pipes and copper pipes in the water supply industry has been rapidly developed, which has contributed to improving water supply quality, preventing secondary pollution, reducing water pipe leakage, and protecting residents’ health. And saving water resources has important economic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/06
Inventor 李春峰于海平徐志丹赵志学
Owner HARBIN INST OF TECH
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