Spreading welding method of magnesium alloy and aluminum alloy containing composite middle layer

A composite intermediate layer, diffusion welding technology, applied in welding equipment, non-electric welding equipment, metal processing equipment and other directions, can solve the problems of easy mutual reaction, high thermal brittleness, low strength of welded joints, etc., to achieve high-strength welding, simple process , the effect of promoting promotion

Inactive Publication Date: 2013-01-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the differences in physical and chemical properties of magnesium-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 has a large thermal brittleness and is very reactive. High, easy to react with oxygen in the air to form an inert oxide film on the surface, the existence of oxide film is not conducive to the mutual dif

Method used

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  • Spreading welding method of magnesium alloy and aluminum alloy containing composite middle layer
  • Spreading welding method of magnesium alloy and aluminum alloy containing composite middle layer
  • Spreading welding method of magnesium alloy and aluminum alloy containing composite middle layer

Examples

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Effect test

Embodiment 1

[0032] Vacuum diffusion welding of magnesium alloy and aluminum alloy, among which: the magnesium alloy to be welded is Φ25×5mm Mg1 pure magnesium, the aluminum alloy to be welded is Φ25×5mm1060A pure aluminum, the thickness of nickel foil is 10μm, and the thickness of aluminum film is 1.5μm .

[0033] Specific steps are as follows:

[0034] 1. Cleaning of the surface to be welded:

[0035] Use an ultra-precision surface grinder to process magnesium alloy and aluminum alloy into round sheets. Before welding, use 1000#, 1200# sandpaper and 05, 06 metallographic sandpaper to grind the surface to be welded of the round sheet, perform mechanical polishing, and use acetone solution for ultrasonic cleaning 10min, transferred to acetone solution for storage.

[0036] 2. Magnetron sputtering Al film coating on the surface of magnesium alloy to be welded:

[0037] Magnetron sputtering is used to deposit an Al thin film layer on the surface of the magnesium alloy to be welded after t...

Embodiment 2

[0041] Vacuum diffusion welding is performed on magnesium alloy and aluminum alloy, among which: the magnesium alloy to be welded is MB2 magnesium alloy with a diameter of Φ25×5mm, the aluminum alloy to be welded is Φ25×5mm2A12 aluminum alloy, the thickness of the nickel foil middle layer is 100μm, and the thickness of the aluminum film is 2 μm.

[0042] Specific steps are as follows:

[0043] 1. Cleaning of the surface to be welded:

[0044] Use an ultra-precision surface grinder to process magnesium alloy and aluminum alloy into round sheets. Before welding, use 1000#, 1200# sandpaper and 05, 06 metallographic sandpaper to grind the surface to be welded of the round sheet, perform mechanical polishing, and use acetone solution for ultrasonic cleaning 10min, transferred to acetone solution for storage.

[0045] 2. Magnetron sputtering Al film coating on the surface of magnesium alloy to be welded:

[0046] Magnetron sputtering is used to deposit an Al thin film layer on th...

Embodiment 3

[0050] Vacuum diffusion welding is carried out on magnesium alloy and aluminum alloy, among which: the magnesium alloy to be welded is AZ31B magnesium alloy with a diameter of Φ25×5mm, the aluminum alloy to be welded is 6061 aluminum alloy with a diameter of Φ25×5mm, the thickness of the middle layer of nickel foil is 30μm, and the aluminum film The thickness is 1.8 μm.

[0051] Specific steps are as follows:

[0052] 1. Cleaning of the surface to be welded:

[0053] Use an ultra-precision surface grinder to process magnesium alloy and aluminum alloy into round sheets. Before welding, use 1000#, 1200# sandpaper and 05, 06 metallographic sandpaper to grind the surface to be welded of the round sheet, perform mechanical polishing, and use acetone solution for ultrasonic cleaning 10min, transferred to acetone solution for storage.

[0054] 2. Magnetron sputtering Al film coating on the surface of magnesium alloy to be welded:

[0055] Magnetron sputtering is used to deposit an...

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Abstract

The invention relates to a low temperature high intensity welding method of magnesium alloy and aluminum alloy containing a composite middle layer. The method includes utilizing an aluminum film and a nickel foil to serve as a composite middle layer. The aluminum film is precipitated on the face of magnesium alloy to be welded by magnetron sputtering. The method further includes adopting vacuum spreading welding with the welding temperature as 400-460 DEG C, keeping the temperature for 10-120min and enabling the welding pressure to be 0.1-3MPa. The method has the advantage of utilizing a composite middle layer of the aluminum film and the nickel foil to achieve spreading welding of the magnesium alloy and the aluminum alloy. Addition of the aluminum film layer and the nickel foil changes magnesium/aluminum interface phase composition and microstructure, and avoids generation of compounds between high-hardness fragile magnesium and aluminum at the interface. The shearing strength reaches 26MPa, and the magnetron sputtering aluminum coated film on the face of the magnesium alloy to be welded improves inoxidizability of the face of the oxydic magnesium alloy to be welded and improves structure and performance of products between Mg and Ni. The method is suitable for reliable welding of magnesium alloy and aluminum alloy in different kinds, and is simple in process, high in parallel accuracy and small in welding piece transformation.

Description

technical field [0001] The invention relates to the field of connecting magnesium alloys and aluminum alloys, in particular to a high-strength welding method for magnesium alloys and aluminum alloys. 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. As a rapidly emerging new green engineering structural material, Mg alloys have broad application prospects in aerospace, national defense, automo...

Claims

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Application Information

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IPC IPC(8): B23K20/14B23K20/233B23K20/24
Inventor 沈强张建罗国强李美娟王传彬张联盟
Owner WUHAN UNIV OF TECH
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