Non-vacuum semi-solid stirring brazing method for aluminum alloy and composite material thereof

Abstract

The invention provides a semi-solid brazing method for aluminum alloy and a composite material thereof under the assistance of non-vacuum mechanical stirring, which comprises the steps of: mounting a weldment taking the aluminum alloy or the composite material thereof as a base material on a welding platform first; placing intermediate-temperature solder on two surfaces to be welded, heating the weldment to between 390 and 420 DEG C, and ensuring that the solid fraction of the solder is between 50 and 80 percent; staring a rotary sliding device, wherein the rotating speed is between 150 and 300 r / m, the temperature is constant, and the longitudinal movement rate, which is parallel to a welding seam, of a stirring head is between 0.5 and 2 cm / min; stopping the rotary sliding when the stirring head moves to the terminal of the welding seam; increasing the temperature to between 430 and 450 DEG C, performing thermal insulation for 1 to 5 minutes, and ensuring that the solid fraction of the solder is between 10 and 40 percent; restarting the rotary device again, wherein the rotating speed is between 20 and 150 r / m; sliding the stirring head in a reverse direction, wherein the movementspeed is between 1 and 2 cm / m; stopping the rotation, when the stirring head moves to the initial end of the welding seam, and lifting the stirring head; and cooling the solder along with a furnace after thermal insulation for 5 to 30 minutes. The method can realize the low-cost, high-efficiency and high-quality welding of the aluminum alloy or the composite material thereof.

Description

Technical field

[0001] The invention relates to a welding method of aluminum alloy and its composite materials. Background technique

[0002] New aerospace structural materials with high specific strength and high dimensional stability are the basis for reducing the weight of spacecraft, improving spacecraft launch capabilities and improving the transient emergency characteristics of weaponry. Aluminum-based composite materials have the advantages of high specific strength, high specific elastic modulus, high dimensional stability, good wear resistance, etc., and have great potential use value in the aerospace field and weapon equipment field, and they are also the basis of current new materials in my country the focus of research. However, if aluminum-based composite materials want to be further promoted and applied in aerospace, weaponry and civilian products, they must solve the problem of secondary processing technology, especially the welding technology of some complex compo...

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