Solid state heat sink device used for friction stir welding and welding method of solid state heat sink device

Abstract

The invention discloses a solid state heat sink device used for friction stir welding and a welding method of the solid state heat sink device. The solid state heat sink device comprises a solid state heat sink, a push rod connected with the solid state heat sink and a cooling water pipe, wherein the solid state heat sink comprises an upper bottom face, a lower bottom face and a side face, heat dissipation through grooves are formed in the lower bottom face, cooling water channels are formed in the side face, the cooling water channels are connected with the cooling water pipe, and an installation hole used for installation of the push rod is formed in the upper bottom face of the solid state heat sink. The solid state heat sink device synchronously moves in the welding direction along with a friction stir welding device, and the lower bottom face makes full contact with the surface of a weldment so that heat conduction can be achieved, heat dissipation and cooling can be conducted on a weld joint which is still at a high temperature, and the peak temperature of the weld joint can be effectively lowered. Meanwhile, cooling water is injected into the water channels formed inside the heat sink to conduct forced heat dissipation and cooling. According to the solid state heat sink device and the welding method, the weld joint can be prevented from being overheated, weld joint crystalline grains are refined, the well-formed formation is improved, residual stress and strain of a welded joint can be eliminated or reduced, and the aims of improving the quality of the weld joint and improving the comprehensive performance of the joint are achieved.

Description

technical field [0001] The invention relates to a solid-state heat sink device and method for friction stir welding, which can be used for heat dissipation and cooling and quality control of friction stir welding parts, and belongs to the fields of mechanical technology and material engineering. Background technique [0002] Friction Stir Welding (FSW) is a new type of solid-phase joining technology, which overcomes the problems of welding defects such as cracks and pores in the fusion welding method, and enables some materials that were difficult to weld in the past to achieve high-quality welding. , and has irreplaceable obvious advantages in the fields of welding aluminum, magnesium and its alloys. During the friction stir welding process, the friction between the stirring head and the material to be welded generates high temperature, and the material around the stirring head enters a thermoplastic state, and diffusion and dynamic recrystallization occur under the act...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a "dry" solid-state heat sink device and method used in the friction stir welding process to achieve effective control of the weld temperature field and solve the "wet" problem. The "wet method" cooling requires complex supporting equipment and technical conditions, and the operation is more complicated, and fundamentally eliminates the defects such as weld hydrogenation and material corrosion caused by "wet" cooling

At the same time, it solves the problems of small contact area between the radiator and the welding seam and short cooling time in the general "dry" cooling, so as to obtain obvious heat dissipation effect and improve the welding quality.

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