Al-Cu transient liquid phase diffusion bonding method of Al alloy

Abstract

The invention relates to an Al-Cu transient liquid phase diffusion bonding method of Al alloy, comprising the following steps: 1, carrying out pre-welding treatment on a workpiece, mechanically processing the surface of an Al alloy part subject to machine-shaping, and then carrying out ultrasonic cleaning on the aluminum alloy part in acetone to remove greasy dirt and other impurities; 2, preparing an intermediate layer, firstly preplacing a Cu plating layer with the thickness of 310 mu m by a plating mode on the surface of the Al alloy; and 3, placing a workepiece group to be connected to a braze welding furnace according to a required connection mode, applying a balance weight on the sample, heating the workpiece to a temperature ranging from 550 to 560 DEG C, insulating for 1-10min, stopping heating, cooling down the sample along with the furnace to below 200 DEG C, taking out of the sample and cooling in air to room temperature to finish connection, wherein the weight of the balance weight is determined according to the area of the soldered joint by generally taking the weight capable of providing 0.02MPa pressure on the connection surface as a criterion, and the connection environmental requirement is that the vacuum degree is larger than or equal to 4 *10<-3>Pa.

Description

technical field [0001] The invention relates to a connection technology of aluminum alloy precision devices, in particular to an Al alloy Al-Cu instantaneous liquid phase diffusion [0002] The connection method belongs to the technical field of diffusion connection. Background technique [0003] With the lightweight of weapons and equipment and the improvement of technical and tactical indicators, aluminum alloy thin-walled complex components are more and more widely used in the military industry. There are certain problems in the brazing of aluminum alloy thin-walled complex components such as X-band row-column feeders and high-efficiency liquid-cooled modules. During brazing, the fillet R is not easy to control, and local brazing material is easy to partially block the liquid-cooled flow channel or flow on the microwave components. The surface of the inner cavity reduces the performance index of the component and affects the yield of the component. [0004] When dif...

AI Technical Summary

Problems solved by technology

[0005] The method of liquid phase formation in liquid phase diffusion welding, the relevant connection process specifications and the formed intermediate reaction products directly determine the connection performance and shape and position tolerance of the components. The connection performance and shape and position tolerance in the current existing technology are not very ideal Through the new process technology, it is hoped that the connection performance can be improved, the connection deformation can be reduced, and the weld fillet can be controlled, so as to vigorously promote its application in aluminum alloy precision components.

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