A double-sided micro-channel heat sink for suppressing fsw joint delta phase and its application method

Abstract

The invention discloses a double-sided microchannel radiator for suppressing the delta phase of a FSW joint and a use method thereof, comprising an upper microchannel radiator, a lower microchannel radiator, a push rod connected with the microchannel radiator, and a pipeline for transporting nanofluids , the side of the micro-channel heat sink is provided with a micro-channel, the micro-channel is connected to the pipeline for transporting nanofluid, the micro-channel heat sink device is connected to the friction stir welding spindle through a push rod, and moves synchronously along the welding direction, and the bottom surface is in full contact with the surface of the weldment to Realize heat conduction, dissipate heat and cool down the welds that are still at high temperature, effectively reduce the peak temperature of the welds, and in addition, pass nanofluids through the microchannels opened inside the radiator for forced heat dissipation and cooling. The invention suppresses the formation of delta ferrite, reduces weld overheating, refines weld grains, improves tissue uniformity, reduces or eliminates residual stress and deformation of welded joints, and achieves the purpose of improving the quality of welded joints and improving the comprehensive performance of joints.

Description

technical field [0001] The invention relates to a double-sided microchannel radiator device for suppressing the generation of delta ferrite in friction stir welding (FSW) welded joints of low activation martensitic (RAFM) steel, which can be used for precise cooling of friction stir welded parts and quality control, belonging to the field of mechanical control 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 that are prone to occur in traditional welding methods, and enables some materials that were difficult to weld in the past to achieve high-quality welding. welding. In the FSW process of RAFM steel, the heat generated by the high-speed rotation of the stirring head and the friction between the workpiece causes local plastic deformation of the test plate to be welded, and the temperature can be as high as ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a double-sided microchannel heat sink that suppresses the delta phase of FSW joints and its use method, to realize precise cooling and quality control of friction stir welded parts, and to solve the problem of "wet" The "wet method" cooling requires complex supporting equipment and technical conditions, and the operation is more complicated, and fundamentally eliminates defects such as weld hydrogenation and material corrosion caused by "wet" cooling

At the same time, it solves the problems that the general "dry method" cooling effect is relatively limited and the cooling speed on both sides of the weld is not the same, and realizes the rapid passage through the formation temperature range of δ ferrite, thereby inhibiting the formation of δ ferrite and improving the welding quality. Purpose

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