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Low-temperature diffusion welding method for magnesium alloy and aluminum alloy

A technology of diffusion welding and magnesium alloy, which is applied in the field of welding of magnesium alloy and aluminum alloy, and low temperature diffusion welding of magnesium alloy and aluminum alloy. Reliable and precise welding, the effect of improving joint strength and bonding strength

Inactive Publication Date: 2010-12-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical difficulty of welding Mg / Al dissimilar metals is very high. Magnesium has great thermal brittleness, and it is difficult to obtain welded joints that meet the performance requirements by conventional welding methods. Easy to form intermetallic compounds, which greatly reduces the performance of joints

Method used

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  • Low-temperature diffusion welding method for magnesium alloy and aluminum alloy
  • Low-temperature diffusion welding method for magnesium alloy and aluminum alloy
  • Low-temperature diffusion welding method for magnesium alloy and aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The magnesium alloy sheet 4 is diffusion-connected to the aluminum alloy sheet 2, wherein: the magnesium alloy sheet 4 is a MB2 magnesium alloy sheet with a diameter of Φ29 mm, and the aluminum alloy sheet 2 is a 2A12 aluminum alloy sheet with a diameter of Φ29 mm. Diffusion bonding process conditions are: welding temperature 400 ℃, holding time 60min, welding pressure 0.1MPa.

[0027] The specific steps of diffusion bonding the magnesium alloy sheet 4 and the aluminum alloy sheet 2 are as follows:

[0028] Preparation before welding: The middle layer material is tin-zinc foil 3 with a thickness of 5 μm (Sn / Zn ratio is 1: 1), and the tin-zinc foil 3 is processed into a disc with the same diameter as the magnesium alloy sheet 4 and the aluminum alloy sheet 2, Ultrasonic cleaning with acetone solution for 10 min. Use a surface grinder to process the magnesium alloy sheet and aluminum alloy sheet into a round sheet with a parallelism better than 0.05mm. Before welding, us...

Embodiment 2

[0032] The magnesium alloy sheet 4 is diffusion-connected to the aluminum alloy sheet 2, wherein: the magnesium alloy sheet 4 is a MB2 magnesium alloy sheet with a diameter of Φ29 mm, and the aluminum alloy sheet 2 is a 2A12 aluminum alloy sheet with a diameter of Φ29 mm. Diffusion bonding process conditions are: welding temperature 450 ℃, holding time 10min, welding pressure 1 MPa.

[0033] The specific steps of diffusion bonding the magnesium alloy sheet 4 and the aluminum alloy sheet 2 are as follows:

[0034] Preparation before welding: the middle layer material is tin-zinc foil 3 with a thickness of 30 μm (Sn / Zn ratio is 1: 9), the tin-zinc foil 3 is processed into a disc with the same diameter as the magnesium alloy sheet 4 and the aluminum alloy sheet 2, Ultrasonic cleaning with acetone solution for 10 minutes; use a surface grinder to process the magnesium alloy sheet and aluminum alloy sheet into a round sheet with a parallelism better than 0.05mm, and grind the round...

Embodiment 3

[0038] The magnesium alloy sheet 4 and the aluminum alloy sheet 2 are diffusion-bonded, wherein: the magnesium alloy sheet 4 is an AZ31B magnesium alloy sheet with a diameter of Φ29mm, and the aluminum alloy sheet 2 is a Φ29mm 1060 aluminum alloy sheet. Diffusion bonding process conditions are: welding temperature 400 ℃, holding time 30min, welding pressure 0.5MPa.

[0039] The specific steps of diffusion bonding the magnesium alloy sheet 4 and the aluminum alloy sheet 2 are as follows:

[0040]Preparation before welding: the middle layer material is tin-zinc foil 3 with a thickness of 50 μm (Sn / Zn ratio is 1: 5), the tin-zinc foil 3 is processed into a disc with the same diameter as the magnesium alloy sheet 4 and the aluminum alloy sheet 2, Ultrasonic cleaning with acetone solution for 10 minutes; use a surface grinder to process the magnesium alloy sheet and aluminum alloy sheet into a round sheet with a parallelism better than 0.05mm, and grind the round sheet with 1000#, ...

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Abstract

The invention discloses a low-temperature diffusion welding method for magnesium alloy and aluminum alloy. The method comprises the following steps of: (1) workpiece surface cleaning: processing a magnesium alloy plate and an aluminum alloy plate to a specified size, and removing oxide layers from to-be-welded surfaces thereof; (2) workpiece assembly: placing a tin-zinc alloy foil serving as a middle layer between the aluminum alloy plate and the magnesium alloy plate, and placing a solder mask on and below the plates respectively to form a welded workpiece; and (3) charging the workpiece into a furnace and welding: putting the welded workpiece into a vacuum diffusion welding furnace, performing heating and heat preservation, applying an axial pressure to the welded workpiece when the heat preservation begins, and releasing the pressure when the heat preservation is finished. The method can effectively overcome the defect that the prior art cannot realize high-quality welding between the Mg alloy and the Al alloy, is suitable for reliable welding between the Mg alloy and the Al alloy of different categories, is particularly suitable for welding the thin magnesium alloy plate and the thin aluminum alloy plate, and has good welding planarity, high parallel precision and integral compactness.

Description

technical field [0001] The invention belongs to a diffusion welding method for dissimilar alloys, in particular to a welding method for a magnesium alloy and an aluminum alloy, and is particularly suitable for the low-temperature diffusion welding method for a magnesium alloy and an aluminum alloy. Background technique [0002] Aluminum alloy has been one of the most widely used metal materials in the defense industry. Because aluminum alloy has the characteristics of low density, high strength, and good processing performance, it can be made into profiles, pipes, plates, etc. of various cross-sections. Therefore, aluminum alloy is the preferred lightweight structural material for lightweight components. In the aviation industry, aluminum alloys are mainly used to manufacture aircraft skins, bulkheads and long beams; in the aerospace industry, aluminum alloys are important component materials for launch vehicles and spacecraft. [0003] As a rapidly emerging new green engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/22B23K20/24
Inventor 沈强张建罗国强李美娟张联盟
Owner WUHAN UNIV OF TECH
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