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Microbeam tungsten argon arc welding method for magnesium alloy thin-walled tube

A technology for argon tungsten arc welding and thin-walled tubes, which is used in arc welding equipment, welding equipment, welding media, etc. To meet the requirements of use and other issues, to achieve the effect of convenient and flexible application, high welding efficiency and low yield

Inactive Publication Date: 2012-07-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, friction stir welding has strict positioning of the workpiece, and it is difficult to realize the connection of thin-walled pipe structures and complex joints
Electron beam welding and diffusion welding are also difficult to realize the welding of magnesium alloy thin-walled tubes. Brazing can realize its connection, but the joint strength is low and it is difficult to meet the use requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low-magnesium alloy welding wire with a diameter of 1.2mm is used to butt-weld a magnesium alloy tube with an outer diameter of 30mm and a wall thickness of 1.0mm. Before welding, use acetone to remove the oil on the surface of the welding wire, then polish the welding wire with fine sandpaper and wipe it with absolute ethanol. The diameter of the tungsten pole is 1.0mm. The mass percentage composition of the low magnesium alloy welding wire is: Al 9.5%, Zn 1.75%, Mn 0.15%, Cu 0.03%, Si 0.04%, and the rest is Mg.

[0022] First install and clamp the butt pipe fittings on the chuck of the horizontal lathe, leaving no gap in the butt joint. The welding process parameters are: DC reverse polarity, welding current 20A~30A, welding voltage 14V, welding linear speed 80cm / min~95cm / min, argon gas flow 12L / min~16L / min. During the whole welding process, the tube is always filled with argon gas with a purity of 99.9% for protection.

[0023] During the welding process, the we...

Embodiment 2

[0025] Butt welding of magnesium alloy thin-walled tubes with an outer diameter of 40mm and a wall thickness of 1.5mm. The length of the connected pipe fittings is 140mm.

[0026] A low-magnesium alloy welding wire with a diameter of 1.2mm is used, and its mass percentage composition is: Al 11.6%, Zn 0.6%, Mn 0.2%, Cu 0.02%, Si 0.02%, and the rest is Mg.

[0027] Before welding, use acetone to remove the oil on the surface of the welding wire, and then polish the welding wire with fine sandpaper. The diameter of the tungsten pole is 1.5mm.

[0028] First install and clamp the butt pipe fittings on the chuck of the horizontal lathe without leaving a gap, and fill the thin-walled pipe with copper round liner rods. The welding process parameters are: DC reverse polarity, welding current 40A~60A, welding voltage 18V, welding linear speed 60cm / min~80cm / min, argon gas flow 12L / min~18L / min.

[0029] During the welding process, keep the tungsten pole perpendicular to the pipe fitti...

Embodiment 3

[0031] A low-magnesium alloy welding wire with a diameter of 1.6mm is used to butt-weld a magnesium alloy tube with an outer diameter of 45mm and a wall thickness of 2.0mm. The mass percentage composition of the low magnesium alloy welding wire is: Al 10%, Zn 1.50%, Mn 0.5%, Cu 0.03%, Si 0.01%, and the rest is Mg.

[0032] Before welding, first use acetone to remove the oil on the surface of the welding wire, then use a NaOH solution with a mass concentration of 15% to clean it for 12 minutes at 20 ° C to 25 ° C, rinse with water, and then use a 30% volume concentration of nitric acid solution to clean and rinse with water. Then dry at 40°C.

[0033] The diameter of the tungsten pole is 2.0mm. First install and clamp the butt pipe fittings on the chuck of the horizontal lathe without leaving a gap, and fill the thin-walled pipe with copper round liner rods. The welding process parameters are: DC reverse polarity, welding current 70A~110A, welding voltage 20V, welding linear ...

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Abstract

The invention relates to a microbeam tungsten argon arc welding method for a magnesium alloy thin-walled tube. A low-magnesium aluminum alloy welding wire is used as a filling material, and the thin-walled tube is welded by a microbeam tungsten argon arc welding process under inert gas shielding. The low-magnesium aluminum alloy welding wire comprise 9.5%-11.6% of Al (aluminum), 0.6%-1.75% of Zn (zinc), 0.15%-0.35% of Mn (manganese), 0.01%-0.05% of Cu (copper), 0.02%-0.05% of Si (silicon) and the balance Mg (magnesium) in mass percent. The microbeam tungsten argon arc welding method for the magnesium alloy thin-walled tube is high in welding efficiency and convenient and flexible in application, and can be used for obtaining a crack-free welding joint without magnesium-aluminum brittle compounds. Compared with a conventional tungsten argon arc welding method, the microbeam tungsten argon arc welding method has the advantages that arc stability of microbeam argon arc welding for the magnesium alloy thin-walled tube is obviously improved, the tensile strength of the welding joint is 30% higher than that of a conventional tungsten argon arc welding joint, the elongation of the welding joint is increased by 10%, and the use requirements of industrial production on magnesium alloy thin-walled tube welding component can be met.

Description

technical field [0001] The invention relates to a nonferrous metal welding method, in particular to a microbeam tungsten argon arc welding method for magnesium alloy thin-walled tubes, and belongs to the field of welding technology. Background technique [0002] Magnesium alloys are light metals used in high-tech fields such as aviation, electronics, and communications. Magnesium is a non-ferrous metal that is lighter than aluminum. Its melting point (650°C), density (1.738g / cm 3 ) are lower than aluminum. Magnesium alloys have higher specific strength and specific stiffness, and have high shock resistance, and can withstand greater impact loads than aluminum alloys. Magnesium alloys also have excellent machinability, and are easy to cast and forge, so the development and application of magnesium alloys have attracted the attention of countries all over the world in recent years. [0003] Magnesium has high vapor pressure and is easy to oxidize. The welding difficulties o...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/067B23K35/28B23K101/06B23K103/08
Inventor 李亚江李嘉宁王娟
Owner SHANDONG UNIV
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