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Resistance spot welding method of aluminium matrix composites

An aluminum-based composite material and resistance spot welding technology, which is applied in the direction of resistance welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problem of small tensile shear force, low joint strength and small nugget diameter of spot welded joints and other problems, to achieve the effect of simple and convenient welding process, reduce equipment damage, and improve tensile and shear force

Inactive Publication Date: 2014-08-13
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is: aiming at defects such as small nugget diameter, small tensile shear force and adhesion of the spot welded joint existing in the existing aluminum matrix composite material resistance spot welding method, the present invention provides a method that can improve At present, the method of resistance spot welding joint performance of aluminum matrix composite material, that is, the present invention provides a new resistance spot welding method of aluminum matrix composite material
The technical solution of the invention is to add a pure aluminum foil between the aluminum matrix composite materials for resistance spot welding connection, thereby effectively improving the performance of the current resistance spot welding joints of aluminum matrix composite materials, that is, thereby solving the problem of resistance spot welding of aluminum matrix composite materials Defects such as small nugget diameter, low joint strength and adhesion

Method used

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  • Resistance spot welding method of aluminium matrix composites

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Effect test

Embodiment 1

[0056] The matrix of the aluminum-based composite material used in the present invention is 2A12 (LY12), and the reinforcing phase is silicon carbide particles; the aluminum-based composite material is used as a plate with equal thickness on both sides, and is processed into a workpiece with a specification of 45×25×1.5mm. The lap length of the aluminum matrix composite material sample is 15mm when welding; the surface and back of the aluminum matrix composite material are sanded with sandpaper before resistance spot welding, the surface oxide film is removed, and then cleaned with acetone and air-dried; the pure aluminum foil used Smooth and flat, and cleaned with acetone and allowed to air dry before resistance spot welding.

[0057] When resistance spot welding is performed on an aluminum matrix composite material whose matrix is ​​2A12 (LY12) and the reinforcing phase is silicon carbide particles, a pure aluminum foil with a thickness of 6 μm is added between the processed ...

Embodiment 2

[0059] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0060] When resistance spot welding is performed on an aluminum matrix composite material with a matrix of 2A12 (LY12) and a reinforcing phase of silicon carbide particles, a pure aluminum foil with a thickness of 5 μm is added between the processed samples of the aluminum matrix composite material. When a pure aluminum foil is added between the materials for spot welding connection, the preload time is 1.5 seconds, the holding time is 1.8 seconds, the electrode pressure is 3200 Newton, the welding time is 0.5 seconds, and the welding current is 19.0 kA.

[0061] The shape of the electrode tip of the spot welder used in the above embodiments is a flat electrode.

Embodiment 3

[0062] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0063] When resistance spot welding is performed on an aluminum matrix composite material with a matrix of 2A12 (LY12) and a reinforcing phase of silicon carbide particles, a pure aluminum foil with a thickness of 7 μm is added between the processed samples of the aluminum matrix composite material. When a pure aluminum foil is added between the materials for spot welding connection, the preload time is 1.0 seconds, the holding time is 1.2 seconds, the electrode pressure is 2800 Newton, the welding time is 0.4 seconds, and the welding current is 17.5 kA.

[0064] The electrode tip shape of the spot welder used in the above embodiments is a dome surface electrode.

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Abstract

The invention discloses a resistance spot welding method of aluminium matrix composites. The resistance spot welding method comprises the following steps: when the aluminium matrix composites are subjected to resistance spot welding connection, additionally arranging a pure aluminium foil with a thickness of 2-10[mu]m between the aluminium matrix composites, and carrying out spot welding connection after the pure aluminium foil is additionally arranged between the aluminium matrix composites at the squeeze time of 0.8-1.8 seconds, the maintenance time of 1.0-2.2 seconds, the electrode pressure of 2500-3500N, the welding time of 0.3-0.5 second and the welding current of 16.5-19.5kA. According to the resistance spot welding method disclosed by the invention, the pure aluminium foil is additionally arranged between the aluminium matrix composites, and then the resistance spot welding is carried out, thus the defects that resistance spot weld nuggets of the aluminium matrix composites are small in diameter, the joints are low in strength, adhesive and the like at present are effectively improved. The resistance spot welding method is used for carrying out spot welding on the aluminium matrix composites, wherein the average diameter of nuggets is 7.2mm, and the average shearing resistance of the joints is 2043.9N.

Description

technical field [0001] The invention relates to a process method for improving the performance of resistance spot welding joints of aluminum-based composite materials, in particular to a method for improving the joint performance by adding pure aluminum foil between two aluminum-based composite materials on the basis of conventional aluminum-based composite material resistance spot welding. Process methods for joint performance. That is, the present invention specifically relates to a method for resistance spot welding of aluminum matrix composite materials. Background technique [0002] Aluminum matrix composites are currently the most widely used and fastest-growing metal matrix composites. They have the advantages of high specific strength, high specific modulus, good wear resistance and low thermal expansion coefficient. Combination design is carried out, so it has a great application prospect. However, the thermophysical properties such as melting point, thermal condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11
CPCB23K11/115B23K11/185B23K11/34B23K35/002B23K35/0261B23K35/0288B23K35/302B23K2103/10
Inventor 李杏瑞牛济泰史新伟
Owner ZHENGZHOU UNIV
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