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Welding wire for high-strength 7xxx aluminum alloy and composite material, and preparation method thereof

An aluminum-based composite material and a technology for the composite material, which are applied in the field of welding wire of high-strength 7xxx aluminum alloy and composite material and its preparation, can solve the problems of performance degradation, poor welding performance, large linear expansion coefficient of aluminum alloy, etc., and prevent Al2O3 Effect of film formation, increased probability of electron scattering, improved weld strength

Inactive Publication Date: 2020-05-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The poor welding quality and poor welding performance between 7xxx series aluminum alloys and their composite materials have always been a problem for welding personnel
Generally speaking, the welding of aluminum alloys generally has the following difficulties: 1) Aluminum alloys have high thermal conductivity and require higher heat dissipation during welding; 2) Aluminum has a high affinity for oxygen and is easy to form an oxide film with a higher melting point; 3) The linear expansion coefficient of aluminum alloy is large, and welding deformation is easy to occur; 4) Zn and Mg elements in 7xxx series aluminum alloys have low melting points and are prone to volatilization; 5) 7xxx series aluminum alloys are prone to overheating in the heat affected zone during welding thermal cycle Aging and grain coarsening, performance degradation
Under the joint action of many influencing factors, it is very difficult to weld the 7xxx series aluminum alloys and composite materials
[0003] With the continuous development of welding technology, various new welding technologies (TIG welding, MIG welding, friction stir welding, etc.) and processes have emerged, which have improved the welding problems of 7xxx series aluminum alloys and composite materials. There are still many limitations in the choice of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A welding wire for high-strength 7xxx aluminum alloys and composite materials, the welding wire is 7xxx series aluminum-based composite materials, and its weight percentage contains the following elements: 7.5% Zn, 2.8% Mg, 2.0% Cu, 0.1% Si, 0.1% Fe , 0.1% Sc, TiB 2 The reinforcing phase content is 4wt.%, and the balance is Al.

[0028] The preparation method of the welding wire that is used for high-strength 7xxx aluminum alloy and composite material of embodiment 1 comprises the following steps:

[0029] S1: Add pure aluminum into the crucible, heat up and melt, add JZF-03 covering agent, cover evenly, heat up to 750°C for melting, then mix evenly and dry KBF with a mass ratio of 2:1 4 and K 2 TiF 6 Add salt to the melt, and mechanically stir to fully react for 20 minutes, then add Cu grains, Al-Si alloy (10wt.% Si), Mg grains, Zn grains, and Sc grains in sequence, and add JZJ type refining agent, remove at 750 °C Gas refining for 20 minutes, then remove the react...

Embodiment 2

[0034] A welding wire for high-strength 7xxx aluminum alloys and composite materials, the welding wire is 7xxx series aluminum-based composite materials, and its weight percentage contains the following elements: 10% Zn, 2.8% Mg, 2.0% Cu, 0.1% Si, 0.1% Fe , 0.1% Sc, TiB 2 The reinforcing phase content is 4wt.%, and the balance is Al.

[0035] The preparation method of the welding wire that is used for high-strength 7xxx aluminum alloy and composite material of embodiment 2 comprises the following steps:

[0036] S1: Add pure aluminum into the crucible, heat up and melt, add JZF-03 covering agent, cover evenly, heat up to 750°C for melting, then mix evenly and dry KBF with a mass ratio of 2:1 4 and K 2 TiF 6 Add salt to the melt, and mechanically stir to fully react for 20 minutes, then add Cu grains, Al-Si alloy (10wt.% Si), Mg grains, Zn grains, and Sc grains in sequence, and add JZJ type refining agent, remove at 750 °C Gas refining for 20 minutes, then remove the reacti...

Embodiment 3

[0041] A welding wire for high-strength 7xxx aluminum alloys and composite materials, the welding wire is 7xxx series aluminum-based composite materials, and its weight percentage contains the following elements: 10% Zn, 2.8% Mg, 2.0% Cu, 0.1% Si, 0.1% Fe , 0.1% Sc, TiB 2 The reinforcing phase content is 8wt.%, and the balance is Al.

[0042] The preparation method of the welding wire that is used for high-strength 7xxx aluminum alloy and composite material of embodiment 3 comprises the following steps:

[0043] S1: Add pure aluminum into the crucible, heat up and melt, add JZF-03 covering agent, cover evenly, heat up to 750°C for melting, then mix evenly and dry KBF with a mass ratio of 2:1 4 and K 2 TiF 6 Add salt to the melt, and mechanically stir to fully react for 20 minutes, then add Cu grains, Al-Si alloy (10wt.% Si), Mg grains, Zn grains, and Sc grains in sequence, and add JZJ type refining agent, remove at 750 °C Gas refining for 20 minutes, then remove the reacti...

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Abstract

The invention discloses a welding wire for a high-strength 7xxx aluminum alloy and a composite material, and a preparation method thereof. The welding wire is a 7xxx-series aluminum matrix composite material and comprises the following elements in percentage by weight: 6.7 to 12 percent by weight of Zn, 2.0 to 2.8 percent by weight of Mg, 2.0 to 2.5 percent by weight of Cu, 0.1 percent by weight of Si, 0.1 percent by weight of Fe, 0.1 percent by weight of Sc, 4 to 8 percent by weight of reinforced-phase TiB2, and the balance Al.

Description

technical field [0001] The present invention relates to the technical field of welding wires for aluminum alloys and composite materials thereof, in particular to a welding wire for high-strength 7xxx aluminum alloys and composite materials and a preparation method thereof. Background technique [0002] 7xxx series aluminum alloys and their composite materials are widely used in the fields of aerospace, military industry and national defense, rail transportation and ships due to their high specific strength. The development of modern industry puts forward the requirement of lightweight for material selection and structural design, which requires the transformation of riveted structural parts to welded structural parts. The poor welding quality and poor welding performance between 7xxx series aluminum alloys and their composite materials have always been a difficult problem for welding personnel. Generally speaking, the welding of aluminum alloys generally has the following ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C32/00B23K35/28B23K35/40C22C1/04
CPCB23K35/288B23K35/40C22C1/0416C22C21/10C22C32/0073
Inventor 陈哲朱浩飞陈东李险峰吴一汪明亮刘钧李宇罡王浩伟
Owner SHANGHAI JIAO TONG UNIV
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