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Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint

A friction stir and treatment technology technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem that friction stir welded joints tend to soften, there is no report on the cryogenic treatment technology of friction stir welded joints, and the mechanical properties of the joints decline. and other problems, to achieve the effect of improving mechanical properties, strength and mechanical properties

Inactive Publication Date: 2013-12-04
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] The commonly used treatment method for 5052 aluminum alloy welded structures is that there is no need for subsequent treatment after welding, and it can be directly put into engineering use. Although some scientific and technological workers have studied the cryogenic treatment technology of argon arc welding joints, they have not been used. Friction stir welding Research on cryogenic treatment technology of joints has not been reported
[0005] The aluminum alloy welded joints obtained by the conventional argon arc welding method generally have a softening zone, resulting in a decrease in the mechanical properties of the joint. The softening tendency of the friction stir welded joint is much lower than that obtained by the conventional welding method. The fracture of the tensile test The location is generally in the softening zone of the welded joint

Method used

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  • Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint
  • Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint
  • Treatment process method for improving performance of 5052 aluminum alloy friction stir welding joint

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Embodiment 1

[0017] After the 5052 aluminum alloy is welded by friction stir welding, it is treated at -160~-190°C for 20~24 hours.

[0018] Wherein the micro-shear strength value and hardness value distribution parameters of each zone of the welded joint obtained in embodiment 1 are as follows: figure 1 and figure 2 shown. The distribution of micro-shear strength and hardness value of the welded joint obtained by the method is obviously higher than that of the friction stir welded joint without cryogenic treatment.

Embodiment 2

[0020] After the 5052 aluminum alloy is welded by friction stir welding, it is treated at -160 to -190°C for 4 to 6 hours.

[0021] Wherein the micro-shear strength value and hardness value distribution parameters of each zone of the welded joint obtained in embodiment 1 are as follows: figure 2 and image 3 shown. The distribution of micro-shear strength and hardness value in some regions of the welded joint obtained by the method is higher than that of the friction stir welded joint without cryogenic treatment.

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Abstract

The invention discloses a treatment process method for improving the performance of a 5052 aluminum alloy friction stir welding joint. According to the method, no preheating treatment is required, and final treatment is directly performed on the 5052 aluminum alloy friction stir welding joint; the final treatment comprises the step that a welded structure is directly subjected to subzero treatment at minus 160 DEG C to minus 190 DEG C for 5-24 hours. With adoption of the method disclosed by the invention, the strength (rigidity) of the 5052 aluminum alloy friction stir welding joint can be improved as compared with that of a conventional friction stir welding joint. The mechanical property of the 5052 aluminum alloy friction stir welding joint is improved for certain degree.

Description

technical field [0001] The invention belongs to the heat treatment process, in particular to the technical field of 5052 aluminum alloy friction stir welding joint treatment process. Background technique [0002] Aluminum alloy welded structures are commonly used structures in industrial structures. Under the background of the modern manufacturing industry, the performance of aluminum alloy welded joints is becoming more and more important to the safety performance of corresponding engineering structures. It largely determines Security applications with structures. With the development of science and technology and the improvement of industrial production level, the development of aluminum alloy welding structure production technology provides a strong guarantee for improving the safety application of this type of welding structure. [0003] 5052 belongs to the Al-Mg series aluminum alloy, which is a commonly used aluminum alloy material. It has light structure and high cor...

Claims

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Application Information

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IPC IPC(8): C21D9/50C22F1/047
Inventor 周友龙董立新赵艳丽赵方舟田博
Owner SOUTHWEST JIAOTONG UNIV
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