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Method for manufacturing dissimilar pipe joint by adopting bar stirring friction

A technology of friction stir and pipe joints, which is applied in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of unstable dimensions, low welding efficiency, and low mechanical properties of joints, and reduce the risk of deformation or even bending. Improved production efficiency and excellent mechanical properties

Inactive Publication Date: 2021-08-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method for manufacturing dissimilar pipe joints by bar material friction stir, which can effectively avoid low welding efficiency, low joint mechanical properties, Dimensional instability and other problems, so as to ensure the stable connection of dissimilar thin-walled tubular structures and improve performance

Method used

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  • Method for manufacturing dissimilar pipe joint by adopting bar stirring friction
  • Method for manufacturing dissimilar pipe joint by adopting bar stirring friction
  • Method for manufacturing dissimilar pipe joint by adopting bar stirring friction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a method for manufacturing dissimilar pipe joints using bar material friction stir, such as figure 1 shown, including:

[0031] Put a variety of rods with different materials into the mold 2 in sequence, and the butt ends of the rods fit;

[0032] Stirring rod 1 completes the friction stirring preparation process by setting the pressing amount, rotating speed and pressing speed; under the rotation and stirring action of stirring rod 1, the material around stirring rod 1 produces plastic flow, and the material that undergoes plastic flow is limited in mold 2 In the annular cavity formed with the stirring rod 1, a structural member 5 is formed;

[0033] The structural part 5 in the mold 2 is taken out, and the heterogeneous pipe joint 6 is obtained after post-processing.

[0034] In this embodiment, the rods can be two or more metals or non-metallic materials, such as aluminum alloys, copper alloys, magnesium alloys, titanium alloys, composite m...

Embodiment 2

[0060] In this example, the method described in Example 1 is used to manufacture an aluminum / copper dissimilar alloy transition pipe joint with an outer diameter of 20 mm, an inner diameter of 14 mm, and a wall thickness of 3 mm, wherein the two materials are T2 copper alloy and 1050 aluminum alloy, specifically comprising the following steps:

[0061] Step 1: Preparation before the process:

[0062] Select a stainless steel mold and determine the inner diameter of the mold cavity Φ 1 20mm and cavity depth h 1 40mm, mold wall thickness h 2 is 5mm. The materials of dissimilar pipe fittings to be connected are T2 copper alloy and 1050 aluminum alloy respectively, and the wall thickness is h 3 3mm, the diameter of the stirring rod Φ 2 is 14mm.

[0063] Determine the rod material diameter Φ 3 19mm and material length L 1 9mm, determine the height (depth) L of the bar boss (groove) 2 2mm, the major diameter of the bar boss Φ 4 is 16mm, its minor diameter Φ 5 is 12mm; cor...

Embodiment 3

[0070] In this embodiment, the method described in Embodiment 1 is adopted. The transition pipe joint has a pipe wall thickness of 2 mm, an outer diameter of 30 mm, and an inner diameter of 26 mm for an aluminum / magnesium dissimilar alloy transition pipe joint, wherein the two materials are respectively 6061-T6 aluminum alloy And AZ31B-H24 magnesium alloy, the specific steps are as follows:

[0071] Step 1: Preparation before the process:

[0072] Select a stainless steel mold and determine the inner diameter of the mold cavity Φ 1 30mm and cavity depth h 1 60mm, mold wall thickness h 2 is 5mm. The materials of dissimilar pipe fittings to be connected are 6061-T6 aluminum alloy and AZ31B-H24 magnesium alloy respectively, with wall thickness h 3 2mm, the diameter of the stirring rod Φ 2 is 26mm.

[0073] Determine the rod material diameter Φ 3 29mm and material length L 1 9mm, determine the height (depth) L of the bar boss (groove) 2 3mm, the major diameter of the bar ...

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Abstract

The invention discloses a method for manufacturing a dissimilar pipe joint by adopting bar stirring friction. According to the technical scheme, the method comprises the steps that at least two kinds of bars made of different materials are sequentially placed into a mold, and the butt joint ends of the adjacent bars are matched; A stirring rod completes the stirring friction preparation process at the set pressing amount, rotating speed and pressing speed. Under the rotary stirring action of the stirring rod, materials around the stirring rod generate plastic flow, and meanwhile, under the action of the stirring rod, friction and plastic deformation are generated among the materials, so that connection is realized. The material subjected to plastic flow is limited in an annular cavity formed by the mold and the stirring rod to form a structural part. And the structural part in the mold is taken out, and the dissimilar pipe joint is obtained after aftertreatment. According to the method, the problems that low welding efficiency, low joint mechanical property, unstable size and the like during direct welding of dissimilar thin-wall pipes can be effectively avoided, so that stable connection of the dissimilar thin-wall pipe structures is ensured, and the using performance is improved.

Description

technical field [0001] The invention relates to the field of friction stir welding of dissimilar materials, in particular to a method for manufacturing dissimilar pipe joints by using bar material friction stir. Background technique [0002] In products in various fields, it is often necessary to use various pipes as channels for system medium delivery. Different pipe fittings need to use different pipe materials. In the actual application of pipe materials, due to the limited length of pipe materials, multiple pipe materials are usually required for connection. There are various connection forms of pipe fittings, which are mainly divided into two types: external connection structural parts and direct connection. The former is connected by a sealing ring. Although it is easy to install and detachable, the connection strength is low and the stability is poor. The applicable pipe diameter range is relatively narrow, and the service life is restricted by the sealing ring. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/122B23K20/1245B23K20/1255B23K20/24B23K20/26
Inventor 石磊田春燕武传松
Owner SHANDONG UNIV
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