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Method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joints

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

Active Publication Date: 2019-06-07
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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  • Method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joints
  • Method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joints
  • Method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joints

Examples

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Embodiment 1

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

[0027] A. Use an angle grinder to degrease and deoxidize one side and the surface of two 5mm thick 7075 aluminum alloy plates;

[0028] B. Fix the two plates processed by the angle grinder to the friction stir welding equipment for welding in a side-to-side manner. The 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 amount 200mm.

[0031] The metallographic structure of the weld seam obtained in this embodiment is as follows figure 1 As shown, the weld stru...

Embodiment 2～3

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

Embodiment 2

[0034] The weld metallographic structure diagram that embodiment 2 and embodiment 3 obtain is respectively as follows figure 2 and image 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 corrosion resistance of metal structure surfaces, and relates to a method for improving corrosion resistance of 7075 aluminum alloy friction stir welding joints. The method for improving corrosion resistance of the 7075 aluminum alloy friction stir welding joints comprises the following steps that (1) 7075 aluminum alloy plates are welded by frictionstir welding; (2) cryogenic treatment is carried out on a weldment in liquid nitrogen; and (3) laser quenching treatment is carried out on a weld seam. According to the method for improving corrosionresistance of the 7075 aluminum alloy friction stir welding joints, by performing liquid nitrogen cryogenic treatment on the 7075 aluminum alloy friction stir welding joints, the distribution of welding residual stress can be improved, and the size of a workpiece be stabilized, the temperature difference during laser quenching can be further improved, the quenching effect can be increased, the surface layer structure of the weld seam can be improved, and then the welding joints with excellent corrosion resistance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of metal structure surface corrosion resistance, and in particular 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 processability and mechanical properties, and is widely used. In recent years, friction stir welding has been widely used in the connection of various aluminum alloy materials, especially 7 series aluminum alloys. Compared with traditional welding methods, friction stir welding has high joint quality, small welding deformation, small residual stress, and no welding process. Pollution etc. The study found that the weld nugget zone, heat-affected zone, thermo-mechanical affected zone, and the upper shoulder area of ​​the weld surface area in the cross-sectional area of ​​the weld were significantly reduced ...

Claims

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Application Information

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Patent Type & Authority Applications(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