Method and device for reducing residual stress of friction stir welded sheet

A friction stir and residual stress technology, used in welding equipment, non-electric welding equipment, metal processing equipment, etc., to eliminate residual stress, improve performance, and reduce production costs

Active Publication Date: 2019-03-29
江西永磁磁浮科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the common problem of welding stress in the existing friction stir welding technology, to invent a method that can reduce the residual stress of the friction stir welding plate, and to provide a corresponding welding backing plate device at the same time

Method used

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  • Method and device for reducing residual stress of friction stir welded sheet
  • Method and device for reducing residual stress of friction stir welded sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 shown.

[0027] A method that can reduce the residual stress of friction stir welded plates, the key of which is to set a number of heat source points on the friction stir welding backing plate at the position opposite to the weld seam, the heat source points are heated by high-frequency induction coils to generate heat, so that the heat source points The generated heat source matches the heat generated by the friction stir welding process, and maintains the heat until the end of the entire welding process, reduces the temperature gradient between the welding area of ​​the stirring head and the welded area, and controls the heat output of the heat source after the welding is completed , to keep the welded plate warm, to eliminate the mechanical residual stress in the joint, reduce and eliminate the residual stress of the welded joint. The details are as follows:

[0028] 1. Select the heat source point 2 along the center line of the length direction o...

Embodiment 2

[0033] Such as Figure 1-2 shown.

[0034] A device used in friction stir welding to reduce / eliminate the residual stress of friction stir welded plates, which includes a steel backing plate 1 (it can also be a titanium alloy plate, a tungsten alloy plate, a molybdenum alloy plate and other metal material plates), Such as figure 1As shown, the size of backing plate 1 is 800mm×400mm×30mm. Five circular areas are selected on the backing plate 1 along the center line in the length direction as heat source points 2. The diameter of the circular area is 10mm, and the middle heat source point 2 is located on the backing plate. In the geometric center of the surface, five heat source points 2 are arranged in a "one" shape, and the distance between two heat source points 2 is 100mm (can also be selected between 5mm-500mm); the heat of heat source point 2 comes from the high-frequency induction coil Heating the cylindrical iron core 5 generates heat conduction, and the time required ...

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Abstract

The invention discloses a method and device to reduce residual stress of boards during friction stir welding. The method and the device to reduce residual stress of the boards during friction stir welding have the characteristics that a plurality of heat source points are arranged at the position, corresponding to a welding seam, on a base plate for friction stir welding, the heat source points use a high-frequency induction coil to heat to produce energy and make the heat source produced by the heat source points match with the heat energy produced in the process of friction stir welding; the heat energy is maintained until the whole process of welding ends, and a temperature gradient between the stirring head welding area and the welded area is reduce; and the heat quantity produced by the heat source is controlled to keep the welding boards warm so that mechanical residual stress in the joint can be eliminated and residual stress in the welding joint can be reduced or eliminated. According to the method and device to reduce residual stress of the boards during friction stir welding, residual stress in FSW joints can be reduced or eliminated effectively, the quality and the production efficiency of the FSW joints of the boards can be improved, and the cost of production can be reduced.

Description

technical field [0001] The invention relates to a device used in friction stir welding, especially a device capable of reducing / eliminating the residual stress of friction stir welding plates, specifically a backing plate used in friction stir welding, through which the backing plate Use can reduce / eliminate residual stress in friction stir welded sheets. Background technique [0002] Friction stir welding (FSW) is a new type of solid phase connection technology invented by The Welding Institute (TWI) in 1991 (US 5460317). The principle of this technology is to use the strong friction and friction between the stirring head and the material. The stirring action of the softening material makes the weld joint area in a thermoplastic state and tends to melt and mix. As the stirring head moves forward, a weld seam is formed behind the stirring head to complete the solid phase connection. During the friction stir welding process, the uneven temperature distribution of the plate l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K31/12
CPCB23K20/123B23K20/129B23K31/125
Inventor 邓永芳杨斌汪航谢伟滨
Owner 江西永磁磁浮科技有限责任公司
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