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Aluminum alloy welding wire for high-speed train and preparation method thereof

A technology for aluminum alloy welding wire and high-speed trains, applied in welding equipment, metal processing equipment, welding media, etc., can solve the problems of high hydrogen content and oxide inclusion content, unfavorable high-speed train operation safety, and high oxide inclusion content. Achieve the effects of improving temperature uniformity, reducing the incidence of welding leaks, and reducing hydrogen content

Inactive Publication Date: 2017-11-07
GUILIN UNIV OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main materials used for aluminum alloy car bodies of high-speed trains are Al-Mg, Al-Mg-Si, and Al-Zn-Mg alloys. When ordinary ER5356 and ER5183 welding wires are used for welding, the joint strength is often only the strength of the base metal. 60%-70%, which will be detrimental to the safety of high-speed train operation, especially the fatigue life
Moreover, compared with the imported welding wire, the aluminum alloy welding wire produced in our country has a higher content of hydrogen and oxide inclusions, which seriously affects the quality of the weld.
The welding wire often breaks during the drawing process, mainly due to the high content of oxide inclusions, coarse grains, and dendrite segregation, which lead to a decrease in the plasticity of the aluminum alloy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of aluminum alloy welding wire is as follows:

[0032] Mg:5.0%, Ti:0.1%, Cr:0.2%, Mn:0.1%, La:0.1%, Te:0.1%, Bi:0.02%, Si:0.25%, Fe:0.2%, Zn:0.20%, The individual content of other impurity elements is ≤0.05%, the total content of other impurity elements is ≤0.15%, and the balance is Al.

[0033] Its preparation method is:

[0034] (1) Melting: Put aluminum ingots and intermediate alloys into the melting furnace for melting, add refining agent evenly into the melting furnace according to 0.05-0.1% of the total aluminum alloy, and use iron cages to put magnesium ingots into the melting furnace During the smelting process, electromagnetic stirring is used to accelerate the smelting speed. After the temperature of the molten aluminum reaches 700-730°C, a slag removal vehicle is used to remove slag from the molten aluminum in the melting furnace. The time for removing slag is controlled to be 30-40 minutes. The liquid smelting time is 8h;

[0035]...

Embodiment 2

[0045] The chemical composition of aluminum alloy welding wire is as follows:

[0046] Mg:5.5%, Ti:0.15%, Cr:0.25%, Mn:0.15%, La:0.15%, Te:0.15%, Bi:0.04%, Si:0.20%, Fe:0.15%, Zn:0.18%, The individual content of other impurity elements is ≤0.05%, the total content of other impurity elements is ≤0.15%, and the balance is Al.

[0047] Its preparation method is:

[0048] (1) Melting: Put aluminum ingots and intermediate alloys into the melting furnace for melting, add refining agent evenly into the melting furnace according to 0.05-0.1% of the total aluminum alloy, and use iron cages to put magnesium ingots into the melting furnace During the smelting process, electromagnetic stirring is used to accelerate the smelting speed. After the temperature of the molten aluminum reaches 700-730°C, a slag removal vehicle is used to remove slag from the molten aluminum in the melting furnace. The time for removing slag is controlled to be 30-40 minutes. The liquid smelting time is 6h;

...

Embodiment 3

[0059] The chemical composition of aluminum alloy welding wire is as follows:

[0060] Mg:4.0%, Ti:0.06%, Cr:0.1%, Mn:0.05%, La:0.05%, Te:0.05%, Bi:0.01%, Si:0.23%, Fe:0.16%, Zn:0.18%, The individual content of other impurity elements is ≤0.05%, the total content of other impurity elements is ≤0.15%, and the balance is Al.

[0061] Its preparation method is:

[0062] (1) Melting: Put aluminum ingots and intermediate alloys into the melting furnace for melting, add refining agent evenly into the melting furnace according to 0.05-0.1% of the total aluminum alloy, and use iron cages to put magnesium ingots into the melting furnace During the smelting process, electromagnetic stirring is used to accelerate the smelting speed. After the temperature of the molten aluminum reaches 700-730°C, a slag removal vehicle is used to remove slag from the molten aluminum in the melting furnace. The time for removing slag is controlled to be 30-40 minutes. The liquid smelting time is 7h;

[...

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Abstract

The invention relates to an aluminum alloy welding wire for a high speed train and a preparation method of the aluminum alloy welding wire for the high speed train. The aluminum alloy welding wire for the high speed train is characterized by comprising the following chemical components in percentages by mass: 4.0-6.5% of Mg, 0.06-0.2% of Ti, 0.1-0.3% of Cr, 0.05-0.2% of Mn, 0.05-0.2% of La, 0.05-0.2% of Te, 0.01-0.05% of Bi, less than or equal to 0.25% of Si, less than or equal to 0.2% of Fe, less than or equal to 0.20% of Zn, less than or equal to 0.05% of single content of other impurity elements, less than or equal to 0.15% of total content of other impurity elements and the balance of Al. The preparation method of the aluminum alloy welding wire for the high speed train comprises the following steps: smelting, refining, casting, homogenization, extrusion, drawing, and surface treatment. The aluminum alloy welding wire for the high speed train provided by the invention is fine in weld microstructure and good in crack resistance; the tensile strength, the plasticity and the toughness of welded joints are remarkably higher than those of common ER5356 and ER5183 welding wires.

Description

technical field [0001] The invention relates to the technical field of processing aluminum alloy welding wire, in particular to an aluminum alloy welding wire suitable for high-speed trains and a preparation method thereof. Background technique [0002] Aluminum alloy has high specific strength, specific modulus, fracture toughness, fatigue strength and corrosion resistance, and also has good forming process and weldability, and the cost is relatively low. Therefore, it has become a It is the most widely used non-ferrous metal structural material in the fields of train, chemical industry and military. For example, the command module and lunar module of the spacecraft, the storage tank of the launch vehicle, the storage tank of the satellite, the casing of the tactical missile, the casing of the ship, the aluminum alloy carriage of the high-speed train and the subway train, and the chemical container are all welded by aluminum alloy structural materials. . Aluminum alloy we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 刘运强刘晓刚叶东张文凤
Owner GUILIN UNIV OF AEROSPACE TECH
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