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Stirring head, friction stir welding device and method for processing magnesium-aluminum dissimilar alloys

A technology of friction stir welding and stirring head, which is applied in the direction of metal processing equipment, manufacturing tools, welding equipment, etc., to achieve the effects of low cost, improved comprehensive performance of weld seam, and simple process

Active Publication Date: 2021-12-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects and deficiencies in the above-mentioned prior art, the first object of the present invention is to provide a stirring head, which is not easy to produce defects and harmful phases of intermetallic compounds during the welding process, and the comprehensive performance of the weld is significantly improved

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  • Stirring head, friction stir welding device and method for processing magnesium-aluminum dissimilar alloys
  • Stirring head, friction stir welding device and method for processing magnesium-aluminum dissimilar alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This embodiment is applicable to friction stir welding of dissimilar metals of light metal 6061 aluminum alloy and AZ31 magnesium alloy.

[0059] According to the method of the present invention, the AZ31 magnesium alloy plate with a thickness of 4.08mm is placed on the forward side (right side) of the workbench, and the 6061 aluminum alloy plate with a thickness of 3.95mm is placed on the backward side (left side). Clamp tight. Welding process parameters: rotation speed 900r / min, welding speed 47.5mm / min, shaft shoulder diameter 14mm, reduction 0.1mm, stirring needle offset to magnesium side 0.2mm, cooling water tank temperature before welding is room temperature, stirring needle pierced into After the plate is welded, stay in situ for 5 seconds before welding, and the temperature of the water tank is kept at 70°C.

[0060] Post-weld inspection: there are no defects on the surface and inside of the weld; X-ray diffraction analysis results: no intermetallic compounds a...

Embodiment 2

[0064] This embodiment is applicable to friction stir welding of dissimilar metals of ultra-high-strength 7056 aluminum alloy and AZ31 magnesium alloy.

[0065] According to the method of the present invention, the AZ31 magnesium alloy plate with a thickness of 4.05mm is placed on the forward side (right side) of the workbench, and the 7056 aluminum alloy plate with a thickness of 3.97mm is placed on the backward side (left side). Clamp tight. Welding process parameters: rotation speed 800r / min, welding speed 37.5mm / min, shaft shoulder diameter 14mm, reduction 0.15mm, stirring needle offset to magnesium side 0.4mm, cooling water tank temperature before welding is room temperature, stirring needle pierced into After the plate is welded, stay in place for 4 seconds before welding, and the temperature of the water tank is kept at 60°C.

[0066] Post-weld inspection: there are no defects on the surface and inside of the weld; X-ray diffraction analysis results: no intermetallic c...

Embodiment 3

[0071] This embodiment is applicable to friction stir welding of dissimilar metals of light metal 5052 aluminum alloy and AZ31 magnesium alloy.

[0072] According to the method of the present invention, the AZ31 magnesium alloy plate with a thickness of 4.08mm is placed on the forward side (right side) of the workbench, and the 5052 aluminum alloy plate with a thickness of 3.97mm is placed on the backward side (left side). Clamp tight. Welding process parameters: rotation speed 1180r / min, welding speed 47.5mm / min, shoulder diameter 14mm, reduction 0.15mm, stirring needle biased to magnesium side 0.5mm, cooling water tank temperature before welding is room temperature, stirring needle pierced into After the plate is welded, stay in place for 3 seconds before welding, and the temperature of the water tank is kept at 50°C.

[0073] Post-weld inspection: there are no defects on the surface and inside of the weld; X-ray diffraction analysis results: no intermetallic compounds are ...

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Abstract

The invention discloses a stirring head, a friction stir welding device and a method for processing magnesium-aluminum dissimilar alloys, comprising a cylindrical clamping part, a shaft shoulder and a stirring needle, and the shaft shoulder is a table with a plurality of protruding components , the stirring needle is in the shape of a hexagonal pyramid. The diameter of the circumscribed circular surface of the hexagonal pyramid at one end of the stirring needle is 6-6.2 mm, the circumscribed circular surface of the hexagonal pyramid at the other end of the stirring needle is 3.2-3.5 mm, and the length of the stirring needle is 3.5-3.65 mm , the inclination angle of the frustum of the stirring needle is 44-45°. The shaft shoulder takes the cross-section of the cylindrical clamping part as a reference plane, on which a streamlined protruding member is arranged along the rotation direction of the stirring head, and there are a plurality of protruding members adjacent to each other. Start component intermittent setting. The invention has the advantages of simple process, low cost, high welding efficiency, no defects and harmful phases of intermetallic compounds in the welding process, and the overall performance of the welding seam is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and relates to a stirring head, a friction stir welding device and a method for processing magnesium-aluminum dissimilar alloys. Background technique [0002] With the rapid development of industrial technology, the requirements for lightweight structure are getting higher and higher. Although the weight reduction can be achieved to a certain extent through the optimization design of the structure, it brings great difficulty to the design. Therefore, rational selection of lightweight materials is a relatively effective and easy-to-implement method. As light metal structural materials, magnesium alloy and aluminum alloy have the advantages of low density, high specific strength, and high specific rigidity. They are widely used in the manufacturing industry and gradually become the most promising light non-ferrous metal materials. [0003] In the actual engineering application proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K103/18
CPCB23K20/122B23K20/1255
Inventor 王快社金园园王文王洪铎杨涛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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