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Magnesium alloy and aluminum alloy interlayer diffusion welding method

A diffusion welding and aluminum alloy technology, applied in welding equipment, metal material coating process, welding/welding/cutting articles, etc., can solve the problems of difficult control of welding process, low strength of welded joints, and difficulty in reliable connection, etc., to achieve The overall parallelism is good, the deformation is small, and it is beneficial to the effect of promotion

Inactive Publication Date: 2011-11-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the differences in physical and chemical properties of magnesium and aluminum dissimilar metals, it is very difficult to achieve reliable connection by general welding methods. The main problems in the direct welding of the two metals are: (1) Magnesium and aluminum are highly active and easy to contact with air. The oxygen in the magnesium reacts to form an oxide film on the surface. The existence of the oxide film is not conducive to the mutual diffusion of the base metal atoms, which makes the welding process difficult to control; (2) Magnesium and aluminum are easy to react with each other, and a large amount of High hardness brittle intermetallic compounds and delamination, resulting in weak welded joints

Method used

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  • Magnesium alloy and aluminum alloy interlayer diffusion welding method
  • Magnesium alloy and aluminum alloy interlayer diffusion welding method
  • Magnesium alloy and aluminum alloy interlayer diffusion welding method

Examples

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Embodiment 1

[0034] The magnesium alloy to be welded piece 8 and the aluminum alloy to be welded piece 6 are connected by diffusion welding, wherein: the magnesium alloy to be welded piece 8 is an MB2 magnesium alloy with a diameter of Φ23×2mm, and the aluminum alloy to be welded piece 6 is a diameter of Φ23×2mm to be LY12 aluminum alloy . The magnetron sputtering Cu film layer 7 has a thickness of 0.5 μm, and the diffusion bonding process conditions are: welding temperature 470° C., holding time 30 minutes, and welding pressure 3 MPa.

[0035] see figure 1 , the specific steps of carrying out diffusion welding of the magnesium alloy to-be-welded piece 8 and the aluminum alloy to-be-welded piece 6 are as follows:

[0036] 1. To be welded parts mechanical processing:

[0037] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 # SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish the ...

Embodiment 2

[0044]The magnesium alloy to be welded piece 8 and the aluminum alloy to be welded piece 6 are connected by diffusion welding, wherein: the magnesium alloy to be welded piece 8 is an MB2 magnesium alloy with a diameter of Φ23×2mm, and the aluminum alloy to be welded piece 6 is a diameter of Φ23×2mm to be LY12 aluminum alloy . The magnetron sputtering Cu film layer 7 has a thickness of 0.1 μm, and the diffusion bonding process conditions are: welding temperature 420° C., holding time 120 minutes, and welding pressure 10 MPa.

[0045] see figure 1 , the specific steps of carrying out diffusion welding of the magnesium alloy to-be-welded piece 8 and the aluminum alloy to-be-welded piece 6 are as follows:

[0046] 1. To be welded parts mechanical processing:

[0047] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 # SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish the...

Embodiment 3

[0054] The magnesium alloy to be welded piece 8 and the aluminum alloy to be welded piece 6 are connected by diffusion welding, wherein: the magnesium alloy to be welded piece 8 is an MB2 magnesium alloy with a diameter of Φ23×2mm, and the aluminum alloy to be welded piece 6 is a diameter of Φ23×2mm to be LY12 aluminum alloy piece. The magnetron sputtering Cu film layer 7 has a thickness of 0.3 μm, and the diffusion bonding process conditions are: welding temperature 440° C., holding time 60 minutes, and welding pressure 5 MPa.

[0055] see figure 1 , the specific steps of carrying out diffusion welding of the magnesium alloy to-be-welded piece 8 and the aluminum alloy to-be-welded piece 6 are as follows:

[0056] 1. To be welded parts mechanical processing:

[0057] Magnesium alloys and aluminum alloys are processed into round sheets with ultra-precision surface grinders, and 1000 # , 1200 # SiC sandpaper and metallographic sandpaper No. 05, 06, and 07 were used to polish...

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Abstract

The invention relates to a magnesium alloy and aluminum alloy interlayer diffusion welding method. The method mainly comprises the following steps of: (1) machining a welding metal base, namely processing, abrading, polishing and ultrasonically washing magnesium alloy and aluminum alloy; (2) depositing Cu films on the magnesium alloy and the aluminum alloy by controlling process parameters by using magnetron sputtering coating equipment; and (3) assembling the coated metal base by using a die, placing the die into a vacuum hot-pressing furnace, and controlling welding temperature, heat-preserving time and pressure to obtain a welding joint. The method has the advantages that: (1) the Cu film can protect the surface of the welding metal base better and reduce generation of inert metal oxide layers; (2) the Cu element improves phase constitution and the microstructure of a welding interface and inhibits generation of brittle intermetallic compounds in the midlayer of the welding joint; and (3) the welding joint has high strength, the tensile strength can reach 10 to 20 MPa, small deformation occurs in the welding joint, and the residual stress is small.

Description

technical field [0001] The invention relates to the field of magnesium alloy and aluminum alloy welding, in particular to a method for interlayer diffusion welding of magnesium alloy and aluminum alloy. Background technique [0002] Aluminum is the metal element with the highest content in the earth's crust, and aluminum alloy is one of the most widely used metal structural materials at present. Aluminum alloy has low density, but relatively high strength, which is close to or surpasses high-quality steel. At the same time, it has good plasticity, can be processed into various profiles, and has good electrical conductivity, thermal conductivity, and corrosion resistance. Aluminum alloys are widely used in automotive, aerospace, architectural decoration and other fields. [0003] In recent years, as a new type of engineering structural material, magnesium alloy has attracted more and more attention from all walks of life because of its high specific strength, high stiffness,...

Claims

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Application Information

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IPC IPC(8): B23K20/14B23K20/233B23K20/24C23C14/16C23C14/35B23K103/18
Inventor 张联盟王仪宇罗国强沈强李美娟王传彬
Owner WUHAN UNIV OF TECH
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