Method and device for controlling residual stress on stir friction welding surface

A technology of residual stress and friction stirring, applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of inability to obtain weld quality, achieve the effect of avoiding the decline of welding quality, simple device, and ensuring welding quality

Inactive Publication Date: 2010-07-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve a series of problems such as existing methods for stress and deformation of friction stir welding, which can only locally control deformation and stress, and cannot obtain ideal weld seam quality. Surface residual stress control method and device for friction stir welding to directly eliminate surface stress to obtain ideal welding quality

Method used

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  • Method and device for controlling residual stress on stir friction welding surface
  • Method and device for controlling residual stress on stir friction welding surface
  • Method and device for controlling residual stress on stir friction welding surface

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Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 shown.

[0027] A method for controlling the surface residual stress of friction stir welding. First, an incubator that can move synchronously with the stirring head is installed on the workpiece to be welded, and an insulation layer is installed at the bottom of the fixture that fixes the workpiece to be welded as the bottom plate of the incubator. The weld cover after friction stir welding is installed in an incubator, and the temperature in the incubator is adjusted according to the length of the weld in the cover to keep it constant within the required range of heat preservation temperature. The performance of the welding material, after about 0.5-2 hours of heat preservation, it is cooled with the furnace to eliminate the surface residual stress at the weld. The specific heat preservation time can be determined by consulting the relevant material heat treatment manual. The heat preservation temperature is the heat treatment critical temperature of ...

Embodiment 2

[0029] Such as figure 1 , 2 , 3, 4 shown.

[0030] A friction stir welding surface residual stress control device, which is mainly composed of a suction cup type clamping fixture 25, an incubator 26, a fixing frame 7 and a control system, such as figure 1 As shown, the suction cup type clamping fixture 25 is mainly composed of a base 1, an asbestos heat insulation layer 2, a flat steel plate 3 and an electromagnetic pressure plate 16, as figure 2 As shown, the two sides of the base 1 extend upwards to form an incubator guide rail 4, and the asbestos heat insulation layer 2 is installed on the upper surface of the base 1 between the incubator guide rails 4 on both sides, and the flat steel plate 3 is located on the asbestos heat insulation layer 2, The welded part 5 is placed on the flat steel plate 3, the electromagnetic pressure plate 16 is respectively placed on the two welded parts 5, the base 1 is equipped with an electromagnetic block, and the electromagnetic block pas...

Embodiment 1

[0041] Choose the aluminum alloy sheet material that thickness is 10mm, carry out friction stir welding with conventional friction stir welding and adopt the device of the friction stir welding surface residual stress control method designed by the present invention respectively, the specification of two kinds of methods is the same, both are stirring The rotational speed of the head spindle is 400rpm, and the welding speed is 100mm / min. When applying the device of the present invention, the temperature of heat preservation is 450 DEG C, and the heat preservation time is 1 hour (during specific implementation, according to the difference of welding materials, the heat preservation time generally varies from 0.5-2 hours, which can be determined by consulting the heat treatment manual of relevant materials, as follows same), and then cooled with the furnace. After welding, the distribution of residual stress and residual plastic strain on the inner surface of the plate was analy...

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Abstract

The invention relates to a method and a device for controlling a residual stress on a stir friction welding surface. According to the method, an insulation box capable of moving along a stirring head is adopted to insulate the weld joint and parent metal after welding, and then furnace cooling is performed so as to reduce the residual stress on the stir friction welding surface. The device mainly comprises a sucking-disc type fixture, the insulation box and control equipment, wherein the insulation material mainly comprises fire bricks, asbestos and steel plates. During welding, the insulation box moves along the stirring head and insulates the welded workpiece continuously; and after the welding, the whole workpiece enters the insulation box to be insulated and is cooled with the furnace after being insulated for a certain time so as to control the residual stress on the welding surface and the deformation, wherein the insulating temperature is the critical temperature of the heat treatment of the materials. The device realizes full automation in the whole welding process and avoids the reduction in the welding quality due to a human factor. The method and the device have the advantages of simple device, convenient operation, high technical economic benefit, and high welding quality of the stir friction welding.

Description

technical field [0001] The invention relates to a mechanical processing method and device, in particular to a friction stir welding processing method and device, in particular to a friction stir welding surface residual stress control method and device. Background technique [0002] As we all know, compared with traditional fusion welding methods, ion beam welding and laser welding methods, friction stir welding has lower heat input and smaller deformation after welding. However, in the actual product welding process, it is found that there is a certain inhomogeneity in the distribution of residual stress on the surface after friction stir welding, and the deformation after welding is particularly prominent as the plate thickness decreases. At present, there are few domestic and foreign treatment methods for the surface residual stress of friction stir welding, and most of them focus on deformation treatment. The deformation treatment is mainly the improvement of the fixture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 左敦稳汪洪峰黎向锋于守鑫王吉胜董学伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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