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High performance dissimilar aluminum alloy welded joint containing nanocrystalline composite organization

A technology of dissimilar aluminum alloys and welded joints, which is applied in welding/welding/cutting articles, welding equipment, metal processing, etc., can solve the problems of reducing the performance of dissimilar aluminum alloy welded joints, and achieve simple and easy preparation process and excellent mechanical properties Good results

Inactive Publication Date: 2015-12-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the welding process of dissimilar aluminum alloys, it is extremely sensitive to welding materials. Therefore, most fusion welded joints of dissimilar aluminum alloys will have defects such as welding cracks, thermal stress, brittle intermetallic compounds, etc., which will seriously Reduce the performance of welded joints of dissimilar aluminum alloys, so try to avoid using fusion welding to weld dissimilar aluminum alloys in industry

Method used

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  • High performance dissimilar aluminum alloy welded joint containing nanocrystalline composite organization
  • High performance dissimilar aluminum alloy welded joint containing nanocrystalline composite organization
  • High performance dissimilar aluminum alloy welded joint containing nanocrystalline composite organization

Examples

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Effect test

Embodiment 1

[0024] 1. Preparation of a high-performance dissimilar aluminum alloy welded joint containing nanocrystalline complex phase structure (see figure 1 , figure 2 )

[0025] Take two 5052-O and 6061-T6 aluminum plates, and turn the cross-section of the weld to make it smooth, so as to ensure that there is no gap between the two plates during welding. Afterwards, the surface of the sample was polished with a steel brush, and then two pieces of 5052-O and 6061-T6 aluminum plates with a size of 200×100×6 mm including butt joints were cut off. Place 6061-T6 on the forward side 2 of the welding table, 5052-O on the rotary side 1, and fix it with a fixture. Use a high-speed rotating conical stirring pin to pierce the aluminum plate and move along the welding direction 7. The heat generated by the rotating friction makes the Surrounding materials form a stirring zone 6, and the softened metals in the stirring zone form dissimilar aluminum alloy welded joints through interdiffusion and...

Embodiment 2

[0037] Adjust the welding process parameters, and use butt welding to weld 5052-O / 6061-T6 dissimilar aluminum alloys. The welding process parameters are shown in Table 2:

[0038] Table 2 Welding process parameters of high-performance dissimilar aluminum alloy welded joints containing nanocrystalline multiphase structure

[0039]

[0040]A well-formed 5052-O / 6061-T6 dissimilar aluminum alloy welded joint containing nanocrystalline multiphase structure was obtained. There were about 5nm nanocrystalline grains and dislocations in the weld nugget area, and the fracture morphology of the joint showed obvious micropore aggregation type fracture characteristics, showing good toughness.

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Abstract

The invention discloses a high performance dissimilar aluminum alloy welded joint containing nanocrystalline composite organization, which is prepared by the following steps: 1 taking two 5052-O and 6061-T6 aluminum plates, processing the butt joint surface flat by turning, and polishing the aluminium plate sample surface with a steel brush; 2 placing the 6061-T6 at the forward side of a welding bench and the 5052-O at the revolution side and fixing them with clamps; 3 welding 5052-O and 6061-T6 dissimilar aluminum alloy by stirring friction welding, and the welding technological parameters are as follows: press quantity of 1-2mm, axis inclination of 1-3 DEG, rotating speed of 800-1200 rpm and welding speed of 40-80 mm / min. The invention comprises nanocrystalline composite organization, therefore advantages like high tensile strength, good weld forming, greatly improved comprehensive properties, reliable preparation principle, simple operation and wide market prospect are provided.

Description

technical field [0001] The invention relates to a high-performance heterogeneous aluminum alloy welded joint containing nanocrystalline multiphase structure, specifically a high-performance heterogeneous aluminum alloy welded joint containing nanocrystalline multiphase structure connected by friction stir welding technology, which belongs to the category of materials field of preparation methods. Background technique [0002] Aluminum alloy is an ecological environment-friendly material, which has the advantages of low density, low energy consumption, good recyclability, high specific strength, and corrosion resistance. The use of its alloy and welded structure is an effective way to reduce the weight of the overall structure and improve energy utilization efficiency. One of the ways to avoid or reduce excessive consumption of resources and energy. Among the many types of aluminum alloys, 5xxx aluminum alloys and 6xxx aluminum alloys are the two most widely used series of a...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24B23K20/233B23K103/10B23K101/18
CPCB23K20/122B23K20/1255B23K20/2336B23K20/24B23K2101/18B23K2103/10
Inventor 王斌雷菠菠朱加祥周培山武斌杨眉王良吴登
Owner SOUTHWEST PETROLEUM UNIV
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