Solid-phase welding method and device of overlap connection of aluminum materials and high melting point metal

Abstract

The invention relates to a solid-phase welding method of overlap connection of aluminum materials and high melting point metal. The solid-phase welding method comprises a solid-phase welding process. A solid-phase welding device comprises welding tools. The solid-phase welding method and device is characterized in that the welding tools comprise a double motion control stirring pin and a shaft shoulder separation tool; the axial motion of the stirring pin is controlled by the constant pressure; a shaft shoulder is controlled by the displacement; large area contact and friction characteristics are formed between the end portion of the stirring pin and base metal; a three involute groove is formed in the end surface of the shaft shoulder and accordingly a cohesion trend of the materials is formed; the welding tools are matched with appropriate welding parameters to control an interface intermetallic compound layer and accordingly the stirring friction welding connection with no inclination is achieved. According to the solid-phase welding method of the overlap connection of the aluminum materials and the high melting point metal, the high-strength and high-stability connection between the aluminum materials and the high melting point metal can be achieved and the problem of control of dissimilar metal welding interface intermetallic compounds is solved.

Description

[0001] technical field [0002] The invention belongs to the field of welding, and in particular relates to a solid-phase welding technology, in particular to a solid-phase welding method and device for overlapping an aluminum material with a high-melting point metal or an aluminum-based composite material. Background technique [0003] In the industrial field, dissimilar metal composite structures have been widely used due to the integration of the respective advantages of the two materials, especially aluminum and aluminum materials and other high-melting point metals such as carbon steel, stainless steel, titanium alloys, copper alloys, etc. . Aluminum and aluminum materials have the characteristics of light weight, high thermal conductivity, and high electrical conductivity, while high-melting point metals have the characteristics of high strength and good plastic toughness. The composite structure composed of them can effectively reduce weight or realize structural and ...

AI Technical Summary

Problems solved by technology

[0006] One is the position control of the welding tool: since the welding tool is generally made of tool steel, if it is directly inserted into the high-melting point metal for stirring welding, the welding tool will wear out quickly, and due to the severe friction between the welding tool and the high-melting point metal, it will It will generate localized high temperature, causing the nearby aluminum to melt, and metallurgically react with steel to form brittle intermetallic compounds

[0007] The second is the stability and reliability of welding quality: Since the connection quality between aluminum alloy and high-melting-point metal mainly depends on the interface between the two, when the welding tool is pressed against the surface of high-melting-point metal for moderate friction, the oxide film on the surface will be removed. , it is also necessary to provide an appropriate interface reaction temperature and an appropriate upsetting force to ensure the effectiveness and moderation of the connection interface reaction

[0008] The third is the effective mass transfer of interface materials: on the one hand, it refers to the breaking and dispersion of the oxide film at the overlapping interface; on the other hand, it refers to the frictional heat brought by the effective flow of materials to provide sufficient temperature for the interface reaction

[0009] The existence of the above problems makes friction stir welding welding aluminum and high melting point metals special, and new welding methods and welding tools must be used to ensure high-quality and high-stability welding of this dissimilar metal material

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