Dissimilar metal welding joint and welding method thereof

A technology for welding joints and dissimilar metals, used in welding/welding/cutting items, welding equipment, metal processing equipment, etc., and can solve problems such as low joint strength

Inactive Publication Date: 2013-04-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defect of low joint strength obtained by welding the existing AZ31 magnesium alloy and 7075 aluminum alloy, the object of the present invention is to provide a dissimilar metal welded joint and its welding method, wherein the dissimilar metal refers to the AZ31 magnesium alloy and 7075 aluminum alloy. 7075 aluminum alloy, the welding method is friction stir welding

Method used

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  • Dissimilar metal welding joint and welding method thereof
  • Dissimilar metal welding joint and welding method thereof
  • Dissimilar metal welding joint and welding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Place the 6mm thick AZ31 magnesium alloy welding plate and the 6mm thick 7075 aluminum alloy welding plate, and fix them on the backing plate. The 7075 aluminum alloy welding plate is placed on the forward surface, and the AZ31 magnesium alloy welding plate is placed on the retreating surface ; The shoulder of the stirring head is in the shape of a double concave ring, the stirring needle is a tapered right-handed thread with three planes, the diameter of the stirring needle is 5mm to 7mm, and the shoulder of the stirring head is 20mm; the length of the stirring needle is longer than the welding The thickness of the board is less than 0.4mm;

[0030] (2) The stirring needle is centered with the welding interface, and the stirring head rotates counterclockwise; when welding starts, the insertion speed of the stirring head is 20mm / min, the insertion depth is 5.9mm, and stays for 3s; when starting to move, the rotating speed of the stirring head is 400r / min, the weldin...

Embodiment 2

[0033] The 6mm thick AZ31 magnesium alloy and the 6mm thick 7075 aluminum alloy are docked and placed, fixed on the backing plate, the 7075 aluminum alloy welding plate is placed on the retreating surface, and the AZ31 magnesium alloy welding plate is placed on the forward surface, and the rest of the preparation method steps are implemented in the same way Example 1, a dissimilar metal welded joint was obtained.

[0034] It can be seen that grooves appear on the surface of the welded joint through visual inspection.

Embodiment 3

[0036] (1) Same as step (1) of Example 1;

[0037] (2) Offset the axis of the stirring needle by 1mm toward the direction of the AZ31 magnesium alloy; the inclination angle of the stirring head is 2.5°; the rest of the steps are the same as step (2) of Example 1 to obtain a welded joint of dissimilar metals.

[0038] According to the mechanical performance test and microstructure analysis: if figure 2 As shown, the cracks and intermetallic thickness in the intermetallic compound at the interface of the welded joint are significantly less than those of the welded joint prepared in Example 1, and the tensile strength of the joint is 31.2 MPa.

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Abstract

The invention relates to a dissimilar metal welding joint and a welding method thereof, and belongs to the technical field of welding. The welding joint is formed by friction stir welding of AZ31 magnesium alloy and 7075 aluminum alloy by taking tin as an interface layer, and the thicknesses range of the AZ31 magnesium alloy and the 7075 aluminum alloy is from 5 mm to 20 mm; the welding method comprises the following steps: the 7075 aluminum alloy and the AZ31 magnesium alloy are placed on an advancing side and a retreating side respectively, and fixed in a butted manner, and a tin with thickness of 0.1-0.3 mm is arranged on the welding interface; the axle center of a mixing needle deviates 10-45 percent of the diameter of the mixing needle from the AZ31 magnesium alloy; and a stirring head is inclined at an angle of 2.5-3.5 degrees, the insertion speed of the stirring head is 15-20 mm/min, when the insertion depth of the stirring head is 97-99 percent of thickness of the magnesium or the aluminum alloy, the stirring head moves after being stopped for 1-3 seconds, when the rotational speed of the stirring head is 250-450 r/min, the welding speed is 50-80 mm/min, the stirring head is stopped for 2-6 seconds, and the draw speed of the stirring head is 15-30 mm/min. The welding joint has higher strength and better forming effect; the method is stable, and no environmental pollution is realized; and the pre-welding treatment is simple.

Description

technical field [0001] The present invention relates to a welding joint of dissimilar metals and its welding method, in particular to a friction stir welding of two metals, AZ31 magnesium alloy and 7075 aluminum alloy with a thickness of 5 mm to 20 mm, using tin as the interface layer. A welded joint and a friction stir welding method for the welded joint belong to the technical field of welding technology in material processing engineering. Background technique [0002] Magnesium alloy has high specific strength and specific stiffness, large elastic modulus, and strong damping, vibration and noise reduction capabilities. The density of magnesium alloy is about two-thirds of that of aluminum alloy, its thermal conductivity is lower than that of aluminum alloy, and its strength-to-weight ratio is greater than that of aluminum alloy; Magnesium alloy has the advantages of light weight, high damping, low pollution, and renewable. When competing with other lightweight materials, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/16B23K20/233B23K33/00B23K103/18
Inventor 杨素媛周俊程兴旺王扬卫黄建鹏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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