Aluminum alloy welding wire containing ZrB2 and AlN mixed particles and preparation method thereof

Abstract

The invention discloses an aluminum alloy welding wire containing ZrB2 and AlN mixed particles and a preparation method thereof. The aluminum alloy welding wire comprises the following elements in percentage by weight: 6.1-8.4% of Zn, 2.0-2.9% of Mg, 1.1-2.6% of Cu, 0.1-4% of ZrB2 particles, 0.1-2% of AlN particles, and the balance Al.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding wire, in particular to a ZrB-containing 2 An aluminum alloy welding wire with AlN mixed particles and a preparation method thereof. Background technique [0002] The 7xxx series aluminum alloy has the advantages of high specific strength, good stress corrosion resistance, good processing performance and high fracture toughness. It is also called high-strength or superhard aluminum alloy. and other fields have a wide range of applications. The 7xxx series aluminum alloys can be divided into Al-Zn-Mg series and Al-Zn-Mg-Cu series alloys. Zn element is the main strengthening element, among which Al-Zn-Mg series alloys have medium strength and stress Corrosion tendency, but its weldability is better, and the stress corrosion resistance and strength of Al-Zn-Mg-Cu alloys are higher than those of Al-Zn-Mg alloys, but it is based on the welding performance of the sacrifice material cost...

AI Technical Summary

Problems solved by technology

[0003] During the welding process, 7XXX series aluminum alloy welding wires usually burn out due to the burning of low boiling point elements such as Zn and Mg, so that the strengthening phase in the weld: such as MgZn 2 In addition, due to the relatively large thermal conductivity of the Al alloy, a heat source is required to provide more heat during the welding process, and due to the relatively large linear expansion coefficient of the Al alloy itself, the weld In the process, it is easy to produce defects such as thermal cracks and deformation; moreover, during the welding process, the part of the heat-affected zone may undergo grain coarsening due to excessive heat input and thermal cycles, thereby seriously reducing the weld quality. strength

[0005] Therefore, there is an urgent need to develop a new type of aluminum alloy welding wire, which can not only improve the strength and thermal stability of the weld, but also have better welding performance, and can solve the problem of easy generation of thermal cracks in aluminum alloy welding