A Friction Stir Welding Method of Silicon Carbide Particles Reinforced Aluminum Matrix Composite

Abstract

The invention discloses a friction stir welding method of a silicon carbide particle reinforced aluminum matrix composite material. The friction stir welding method comprises the following steps thatS1, a stir needle is made of conventional tool steel, and a coating with the high abrasion resistance and the high friction coefficient is formed on the surface of the stir needle; S2, a shaft shoulder is made of conventional tool steel, and a coating with the high abrasion resistance and the low friction coefficient is formed on the end face of the shaft shoulder; and S3, in the stationary shaftshoulder friction stir welding process, the rotating stir needle is inserted into a silicon carbide particle reinforced aluminum matrix composite material test plate to be welded, the stationary shaftshoulder can make close contact with the surface of the test plate, the rotating stir needle and the surrounding material conduct friction, the heat is generated on the interfaces of the rotating stir needle and the surrounding material, the material surrounding the stir needle is softened and is in the plastic state under the action of the friction heat, then the stir needle moves in the weldingdirection, and the stationary shaft shoulder slides on the surface of the test plate, so that a weld joint is formed. According to the method, the stationary shaft shoulder friction stir welding technology is adopted, and therefore the friction stir welding of the silicon carbide particle reinforced aluminum matrix composite material is achieved.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a friction stir welding method of silicon carbide particles reinforced aluminum matrix composite materials. Background technique [0002] SiC particle reinforced aluminum matrix composite material (SiCp / Al composite material) has the characteristics of low linear expansion coefficient, low density and high specific strength. There are important applications in remote sensing camera housings, frames and other structures, and their reliable connection is also an important problem that must be solved in engineering applications. Due to the large difference in physical and chemical properties between the matrix and the reinforcement phase of particle reinforced aluminum matrix composites, it brings great difficulty to welding. [0003] Friction Stir Welding (FSW) is a new type of solid-phase joining technology invented by the British Welding Institute (TWI). It has the...

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Problems solved by technology

[0008] The purpose of the present invention is to realize the friction stir welding manufacturing of SiCp / Al composite materials, which can solve the problems of low service life of stirring tools, high cost, excessive heat input and segregation of strengthening phase particles in traditional friction stir welding technology when welding SiCp / Al composite materials And other issues

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