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A welding method for aluminum and copper heterogeneous metal materials

A technology of dissimilar metals and welding methods, applied in welding equipment, metal processing equipment, manufacturing tools, etc., to achieve the effects of improving large residual stress of joints, reducing temperature difference, improving uneven thermal deformation and large residual stress of joints

Active Publication Date: 2020-09-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to provide a brazing method for two heterogeneous metal materials of aluminum and copper that can ensure the mechanical properties of the weld and is relatively easy to implement.

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  • A welding method for aluminum and copper heterogeneous metal materials
  • A welding method for aluminum and copper heterogeneous metal materials
  • A welding method for aluminum and copper heterogeneous metal materials

Examples

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Embodiment 1

[0028] The invention provides a welding method of 5mm thick 2024 aluminum alloy and red copper two dissimilar metal materials, comprising the following steps:

[0029] A. Use a file to make grooves on one side of two pieces of 2024 aluminum alloy and copper with a thickness of 5mm, remove oil and oxide film, and the final groove size is as follows: figure 1 As shown, the groove angle of the aluminum alloy is θ 1 =30°, after bevelling, the thickness direction dimension of the remaining butt joint in the middle is h 1 =2mm; the bevel angle of copper is θ 2 =45°, the thickness direction dimension of the remaining middle part after beveling is h 2 = 3 mm.

[0030] B. Combine the aluminum alloy and the copper base material in pairs to form a butt joint, and number the first group and the second group respectively, and control the butt joint distance of d=1mm for both groups.

[0031] C. Perform pre-welding treatment on the copper base material in the first group, the voltage is...

Embodiment 2

[0036] The invention provides a welding method of 8mm thick 2024 aluminum alloy and red copper two dissimilar metal materials, comprising the following steps:

[0037] A. Use a file to groove one side of two pieces of 2024 aluminum alloy and copper with a thickness of 8mm, remove oil and oxide film, and the final groove size is as follows: Figure 4 As shown, the groove angle of the aluminum alloy is θ 1 =45°, the thickness direction dimension of the remaining middle part after beveling is h 1 =3.5mm; the bevel angle of copper is θ 2 =60°, the thickness direction dimension of the remaining middle part after beveling is h 2 = 5mm.

[0038] B. Combine the aluminum alloy and the copper base material in pairs to form a butt joint, and number the third group and the fourth group respectively, and control the butt joint distance of d=1.5mm for both groups.

[0039] C. Perform pre-welding treatment on the copper base material in the third group, the voltage is 18V, the current is...

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Abstract

The invention relates to a welding method for aluminum and copper heterogeneous metal materials, mainly aimed at the problems of deformation and uneven joint structure caused by the difference in thermal conductivity of 2024 aluminum alloy and red copper heterogeneous metal materials in the T0 state of 5-8mm thickness . The main steps include: (1) Groove processing and welding assembly of 2024 aluminum alloy and copper base material respectively; (2) Pre-welding of copper base material, the parameters are voltage 15‑50V, current 60‑150A, speed 1 ‑10m / min; (3) Brazing of 2024 aluminum alloy and red copper heterogeneous metal material base metal, the flux composition is AlCu 2 , Welding parameters are voltage 20‑60V, current 60‑200A, speed 1‑10m / min. In the present invention, through the selection and control of groove sizes of different materials, pre-welding and brazing parameters, the welding of two dissimilar metals, 2024 aluminum alloy and red copper, can be realized, and a welded joint with excellent welding performance can be obtained.

Description

technical field [0001] The invention relates to a welding method for aluminum and copper heterogeneous metal materials, belonging to the field of welding technology. Background technique [0002] In recent years, with the emergence of new materials, the composite connection of dissimilar materials has been rapidly developed and applied, especially in aerospace, electronic machinery and defense industries. Due to the excellent mechanical properties of aluminum alloy and the good electrical and thermal conductivity of copper, aluminum-copper composite parts are more and more widely used. Therefore, the welding problem of Al-Cu dissimilar metal materials has always been the focus of research. [0003] The welding methods of copper and aluminum dissimilar metal materials mainly include fusion welding, solid state welding and brazing. For fusion welding, defects such as impurities and pores are easily produced in the weld, and because the melting points of aluminum and copper a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/20
CPCB23K1/19B23K1/20
Inventor 谢利王江涛卢雅琳百志好杨林
Owner JIANGSU UNIV OF TECH
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