Non-vacuum semi-solid stirring brazing method for aluminum alloy and composite material thereof
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A technology of composite materials and brazing methods, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of semi-solid connection technology that have not been reported, and achieve the effects of overcoming adverse consequences, reliable joints, and improving performance
Inactive Publication Date: 2009-12-09
CHONGQING UNIV OF TECH
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Problems solved by technology
As mentioned above, there is no report on the semi-solid connection technology with the above characteristics at home and abroad.
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Embodiment 1
[0034]Embodiment 1: The aluminum-based composite material weldment 1 is installed and clamped on the welding platform 4 and Zn-Al medium-temperature solder 2 is placed on the two surfaces to be welded. The solder 2 can be in the form of a sheet, a square column, a coating or sprayed on it in advance. surface to be welded. The weldment is heated by the resistance heater 3, and the heating temperature is between 390-420° C., such as 390° C., 400° C., 410° C., 420° C., so that the solder 2 is partially melted. Then start the rotary slide device, the track type sliding platform 7 drives the stirring head 5 to move, and the rotating motor 8 installed on the motor support 9 drives its rotation, and the rotational speed is 150-300 rev / min, such as 150 rev / min, 180 rev / min. rev / min, 200 rev / min, 230 rev / min, 250 rev / min, 280 rev / min or 300 rev / min, the temperature is constant during the rotation, the longitudinal moving speed of the stirring head 5 parallel to the weld seam is 0.5 -2...
Embodiment 2
[0035] Example 2, the second embodiment of the present invention is based on the first embodiment, after one rotation, the holding temperature is between 430-440°C, such as 430°C, 435°C, 440°C, and the holding time In 2-5 minutes, the solder 2 in the middle is further melted. Subsequently, start the rotating slide device again (secondary rotation), the rotation speed is 100-150 rpm, such as 100 rpm, 120 rpm, 150 rpm, the stirring head slides in the opposite direction, and the moving speed is 1-1.5 cm / min. When the stirring head moves to the initial end of the weld, stop the rotation, lift the stirring head, keep warm for 15-30 minutes, such as 15 minutes, 22 minutes, 27 minutes, 30 minutes, and cool with the furnace.
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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 movement speed 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 an aluminum alloy and its composite material welding method. 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 the launch capability of spacecraft and improving the instantaneous emergency characteristics of weapons and equipment. Aluminum matrix composites have the advantages of high specific strength, high specific elastic modulus, high dimensional stability, and good wear resistance. They have great potential use value in the field of aerospace and weaponry, and are also the basis of new materials in my country. The focus of the research. However, if aluminum-based composite materials are to be further popularized and applied in aerospace, weaponry and civilian products, it is necessary to solve the problem of secondary processing technology, especially the welding technology of some comple...
Claims
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Application Information
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