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A Method for Improving the Corrosion Resistance of 7075 Aluminum Alloy Friction Stir Welding Joints

A friction stir welding and friction stir technology, which is applied in the field of corrosion resistance of metal structure surfaces, can solve the problems of complex process, high cost and environmental pollution, and achieve the effect of simple process, convenient operation and no environmental pollution.

Active Publication Date: 2021-02-09
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the defects of high cost, complex process and environmental pollution in the above-mentioned prior art, the present invention is to provide a method for improving the corrosion resistance of 7075 aluminum alloy friction stir welding joints based on cryogenic-laser quenching, aiming at 7075 aluminum alloy The improvement of the corrosion resistance of the friction stir weld includes the following steps:

Method used

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  • A Method for Improving the Corrosion Resistance of 7075 Aluminum Alloy Friction Stir Welding Joints
  • A Method for Improving the Corrosion Resistance of 7075 Aluminum Alloy Friction Stir Welding Joints
  • A Method for Improving the Corrosion Resistance of 7075 Aluminum Alloy Friction Stir Welding Joints

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Embodiment 1

[0026]The present invention provides a method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joint based on cryogenic-laser quenching, which includes the following steps:

[0027]A. Use an angle grinder to remove the oil and oxide film on one side and surface of two 5mm thick 7075 aluminum alloy plates;

[0028]B. The two plates processed by the angle grinder are fixed to the friction stir welding equipment by side butt joints. The welding process parameters are the speed of 1500r / min, the welding speed of 300mm / min, the forward angle of 3°, and the shaft Shoulder pressure is 0.1mm, no offset;

[0029]C. Put the weldment into liquid nitrogen for cryogenic treatment for 5 minutes;

[0030]D. Use laser quenching equipment to perform laser quenching treatment on the weld. The process parameters are laser power 2000W, scanning speed 10mm / s, scanning direction parallel to the welding direction, spot diameter 4.2mm, and defocusing 200mm.

[0031]The metallographic struct...

Embodiment 2～3

[0033]The laser power 2000W in step D of embodiment 1 is replaced with 3000W (embodiment 2) and 4000W (embodiment 3) respectively, and the other steps and related parameters are the same as in embodiment 1.

Embodiment 2

[0034]The metallographic structure of the weld obtained in Example 2 and Example 3 are as follows:figure 2 withimage 3 As shown, it can be seen that the weld structure is relatively uniform, and the thickness of the surface quenching layer is 2.5mm and 2.6mm, respectively.

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Abstract

The invention belongs to the technical field of metal structure surface corrosion resistance, and relates to a method for improving the corrosion resistance of a 7075 aluminum alloy friction stir welding joint, comprising: (1) welding a 7075 aluminum alloy plate by friction stir welding; (2) welding The parts are cryogenically treated in liquid nitrogen; (3) Laser quenching is performed on the weld. In the present invention, by performing cryogenic treatment with liquid nitrogen on the 7075 aluminum alloy friction stir welding joint, not only can the welding residual stress distribution be improved, the workpiece size can be stabilized, but also the temperature difference during laser quenching can be further increased, the quenching effect can be increased, and the welding process can be improved. Seam surface structure, and then obtain a welded joint with excellent corrosion resistance.

Description

Technical field[0001]The invention belongs to the technical field of surface corrosion resistance of metal structures, and particularly relates to a method for improving the corrosion resistance of 7075 aluminum alloy friction stir welding joints based on cryogenic-laser quenching.Background technique[0002]7075 aluminum alloy is a high-strength aluminum alloy with good processing and mechanical properties and is widely used. In recent years, friction stir welding has been widely used in the connection of various aluminum alloy material structures, especially the 7 series aluminum alloy. Compared with the traditional welding method, it has high joint quality, small welding deformation, small residual stress, and no welding process. Pollution and other advantages. The study found that the weld nugget zone, heat affected zone, thermomechanical affected zone and the upper shoulder area of ​​the weld surface area of ​​the weld cross-section area are significantly reduced in corrosion res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C21D1/00
Inventor 谢利王江涛孙鲁研卢雅琳百志好杨林刘涛王健
Owner JIANGSU UNIV OF TECH