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Method for reinforcing welding joint of aluminum/magnesium alloy thick plate by carbon nano pipe

A carbon nanotube and welded joint technology, which is applied in the field of carbon nanotube reinforced aluminum/magnesium alloy thick plate welded joints, can solve the problems of poor welding seam forming quality, coarse welding seam microstructure, and reduced mechanical properties of welded joints. The effect of improving welding structure, improving mechanical properties, and simple implementation

Active Publication Date: 2019-01-08
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, two problems inevitably arise: one is that the molten droplet of the welding wire is difficult to enter the molten pool due to the obstruction of the surface active agent of the plate, resulting in poor weld formation quality; the other is that although the active flux effectively increases the penetration depth , but the microstructure of welds welded with active flux is obviously coarser than that without active flux, and the mechanical properties of welded joints are seriously reduced
However, there is no application of carbon nanotubes to welded joints of aluminum / magnesium alloy thick plates to solve the problem of decreased mechanical properties of welded joints during active agent welding.

Method used

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  • Method for reinforcing welding joint of aluminum/magnesium alloy thick plate by carbon nano pipe
  • Method for reinforcing welding joint of aluminum/magnesium alloy thick plate by carbon nano pipe
  • Method for reinforcing welding joint of aluminum/magnesium alloy thick plate by carbon nano pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Argon-arc butt welding of 6061 aluminum alloy rolled plates (welding diagram as shown in figure 1 shown):

[0062] (1) The thickness of the 6061 aluminum alloy rolled plate is 7mm, and the size is 70×130mm;

[0063] (2) Before welding, use sandpaper and steel brush to remove the oxide layer on the surface of the plate to be welded, and then clean the surface of the plate with acetone to remove various impurities;

[0064] (3) The active welding wire reinforced by carbon nanotubes has a diameter of 2.0mm, and the shell material is made of pure aluminum, and the inner core is not implanted. The mass percentage of the mixed powder composed of carbon nanotubes and composite active flux is: CNT: 1.1%, CaF 2 : 10.3%, ZnCl 2 : 14.5%, CaCl 2 : 13.6%, SiO 2 : 22.3%, TiO 2 : 24.7%, Te: 13.5%;

[0065] (4) The carbon nanotubes and the composite active flux are ball milled together by a ball milling method, so that the carbon nanotubes are uniformly dispersed in the composit...

Embodiment 2

[0069] Argon-arc butt welding of AZ31 magnesium alloy rolled plates (welding schematic diagram as shown in figure 1 shown):

[0070] (1) The thickness of AZ31 magnesium alloy rolled plate is 6mm, and the size is 60×120mm;

[0071] (2) Before welding, use sandpaper and steel brush to remove the oxide layer on the surface of the plate to be welded, and then clean the surface of the plate with acetone to remove various impurities;

[0072] (3) The active welding wire reinforced by carbon nanotubes has a diameter of 1.6mm, and an AZ31 inner core with a diameter of 0.8mm is implanted inside, and the shell material is made of pure aluminum. The mass percentage of the mixed powder composed of carbon nanotubes and composite active flux is: CNT: 0.9%, CaF 2 : 11.3%, ZnCl 2 : 13.5%, CaCl 2 : 14.7%, SiO 2 : 23.4%, TiO 2 : 23.8%, Te: 12.4%;

[0073] (4) The carbon nanotubes and the composite active flux are ball milled together by a ball milling method, so that the carbon nanotubes a...

Embodiment 3

[0077] Argon-arc butt welding of 5050 aluminum alloy rolled plates (welding schematic diagram as shown in figure 1 shown):

[0078] (1) The thickness of the 5052 aluminum alloy rolled plate is 7mm, and the size is 70×130mm;

[0079] (2) Before welding, use sandpaper and steel brush to remove the oxide layer on the surface of the plate to be welded, and then clean the surface of the plate with acetone to remove various impurities;

[0080] (3) The active welding wire reinforced by carbon nanotubes has a diameter of 2.0mm, and the shell material is made of pure aluminum, and the inner core is not implanted. The mass percentage of the mixed powder composed of carbon nanotubes and composite active flux is: CNT: 2.3%, CaF 2 : 13%, ZnCl 2 : 15%, CaCl 2 : 10.7%, SiO 2 : 24%, TiO 2 : 20%, Te: 15%;

[0081] (4) The carbon nanotubes and the composite active flux are ball milled together by a ball milling method, so that the carbon nanotubes are uniformly dispersed in the composit...

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Abstract

The invention relates to a method for reinforcing a welding joint of an aluminum / magnesium alloy thick plate by a carbon nano pipe, and belongs to the technical field of welding technologies in material machining. A pure aluminum sheath used for wrapping around a mixed powder composed of a carbon nano pipe and an activated rosin flux is used for preparing a novel active welding wire for aluminum / magnesium alloy thick plate welding; the mixed powder comprises the following component, by mass: 0.1%1-2.3% of CNT, 2 to 8-13% of CaF2, 2 to 10-15% of ZnCl2, 10-25% of CaCl2, 2 to 20-25% of SiO2, 2 to20-30% of TiO2 and 10-15% of Te. When the method is used for welding, the welding penetration depth can be not only effectively increased to carry out the aluminum / magnesium alloy thick plate welding, and the carbon nano pipe can be conveyed into the interior of a molten pool, the effects of fine crystal strengthening and dislocation strengthening are achieved in a welding solidification process,and the mechanical property of the welding joint is greatly improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for reinforcing aluminum / magnesium alloy thick plate welding joints with carbon nanotubes. Background technique [0002] Aluminum alloy has the advantages of low density, high mechanical lightness, good plasticity and easy processing and forming. It is second only to steel in metal use, and has been widely used in automobile manufacturing, shipbuilding, aerospace, defense industry, and pressure vessels. . Magnesium alloy is currently the lightest metal structural material, and has the reputation of "green engineering material in the 21st century". It has the advantages of low density and high specific strength, and is widely used in aerospace, automotive electronics and other fields. The welding technology of aluminum alloy and magnesium alloy is the basic technology that the country focuses on at present, and it is also a key topic of research by material ...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K35/36
CPCB23K9/173B23K35/3603
Inventor 刘洪涛周吉学林涛刘玉李涛赵静蕊吴建华刘运腾马百常张琳琳
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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