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Friction stir welding method

A technology of friction stir and welding method, which is applied in the field of stirring, and can solve the problems of reducing the strength of materials in the nugget area, reducing superplasticity, and affecting the appearance of the surface, so as to inhibit the abnormal growth of grains, improve stability, and improve comprehensive mechanical properties. Effect

Inactive Publication Date: 2012-10-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existence of these large-scale grains (up to millimeter scale) reduces the strength, fatigue performance, fracture toughness, and greatly reduces the superplasticity (from 500% to 100% in AA2024), even due to the "orange "Skin effect" affects the surface appearance after processing

Method used

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Embodiment 1

[0020] Embodiment 1: as figure 1 , figure 2 , image 3 As shown, groove 3 is made near the bonding surfaces of 1060-H24 pure aluminum plates 1 and 2 with a thickness of 2.7 mm, the cross-sectional size is 1 mm × 0.5 mm, and the thickness direction of the aluminum plate is 0.5 mm to form a processing area; The aluminum plates 1 and 2 to be welded are docked along the groove direction, placed on the friction stir welding machine tool, and fixed with a clamp; the elemental metal solder pure titanium powder 4 to be reacted with the Al matrix in situ to generate Al3Ti nanoparticles is filled into the groove 3, compacted and flush with the surface of pure aluminum plates 1 and 2; the average particle size of pure titanium powder is about 30 μm; use the stirring head 5 matching the size of the processing area to perform 4 passes on aluminum plates 1 and 2 Friction stir welding treatment, the welding joint 6 with 5%~15% volume fraction of in-situ self-generated Al3Ti nanoparticles ...

Embodiment 2

[0022] Embodiment 2: In embodiment 1, other types of aluminum alloy plates 1 and 2 can also be used, such as pure aluminum plates such as 1050 or high-strength aluminum alloy plates such as AA5083; the mixed solder of metal aluminum powder and titanium powder can also be used; The forward speed of the stirring head 5 is 20~50mm / min, the rotation speed of the stirring head 5 is 1200~1500rpm, 4~8 times of friction stir welding can obtain in situ self-generated Al3Ti nanoparticles and simple substance with a high volume fraction in the weld nugget area. Solder joint 6 with dispersed Ti powder solder particles.

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Abstract

The invention discloses a friction stir welding method. The method is used for welding a joint by realizing dispersive distribution of in-situ authigenic metal aluminide nanoparticles with high volume fraction and residual elementary metal powder welding flux particles in a nugget area via friction stir welding by the aid of in-situ reaction. In the structure of the aluminum plate welded joint prepared by the friction stir welding method, the in-situ authigenic metal aluminide nanoparticles with the high volume fraction and the residual elementary metal powder welding flux particles are distributed in the nugget area in a dispersive manner and are used as small-size reinforced phases, the comprehensive mechanical performance of the welded joint is improved, a crystal boundary also can be pinned, abnormal growth of crystal particles in the nugget area is suppressed, and accordingly the stability of a fine-crystal structure of the nugget area is improved.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and in particular relates to a kind of welding in which a high volume fraction of in-situ self-generated metal aluminide nanoparticles and residual elemental metal powder solder particles are dispersedly distributed in the nugget area by using in-situ reaction. Joint, so as to realize the regulation and control of the microstructure and performance of the friction stir welded joint, especially the method of inhibiting the abnormal grain growth of the post-weld heat treatment process in the nugget area. Background technique [0002] As a new type of welding technology, friction stir welding (FSW) has developed rapidly in recent years. This technology belongs to solid-phase welding. The heat generated by friction between the welding tool and the surface of the base metal and the deformation of the material in the joint area make the joint area reach a high temperature state of about 0...

Claims

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Application Information

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IPC IPC(8): B23K20/12
Inventor 陈科田胜张澜庭单爱党
Owner SHANGHAI JIAO TONG UNIV
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