Method and device for effectively reducing or eliminating residual stress of friction stir welding plate

A friction stir and residual stress technology, used in welding equipment, process efficiency improvement, non-electric welding equipment, etc., can solve problems such as residual stress of welded plates, and achieve the effect of improving performance, high-quality friction stir welding, and reducing production costs.

Inactive Publication Date: 2018-07-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the residual stress of the welded plates common in the existing friction stir welding technology, to inve

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  • Method and device for effectively reducing or eliminating residual stress of friction stir welding plate
  • Method and device for effectively reducing or eliminating residual stress of friction stir welding plate

Examples

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Example Embodiment

[0026] Example one.

[0027] Such as figure 1 Shown.

[0028] A method that can effectively reduce / eliminate the residual stress of the friction stir welding plate. The key is to set several heat source points on the friction stir welding backing plate and the welding seam relative to the welding seam and on both sides to form an array arrangement, each heat source Point uses high-frequency induction coil heating to generate heat, so that the heat source generated by the heat source point matches the heat generated by the friction stir welding process. Its array-type point heat source can generate different residual stresses for different materials due to different material properties and then perform temperature Control and maintain a certain amount of heat until the end of the entire welding process, reduce the temperature gradient between the welding area of ​​the stirring head and the welded area. After the welding is completed, control the heat generation of the heat source to...

Example Embodiment

[0034] Example 2.

[0035] Such as figure 1 Shown.

[0036] A kind of material used in friction stir welding that can effectively reduce / eliminate the residual stress of the friction stir welding plate. It 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 dissimilar material plates) ,Such as figure 1 As shown, the size of the backing plate 1 is 800mm×400mm×30mm. On the backing plate 1, 12 circular areas along the center line of the length direction and on both sides are selected as the heat source point 2. The diameter of the circular area is 10mm, and the heat source point in the middle 2 Located at the geometric center of the backing plate surface, 12 heat source points 2 are arranged in an array, and the distance between the two heat source points 2 is 100mm (also can choose between 5mm-500mm); the heat of heat source point 2 comes from high frequency The induction coil heats the cylindrical...

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Abstract

The invention discloses a method and a device for effectively reducing or eliminating a residual stress of a friction stir welding plate. The method and the device is characterized in that a pluralityof heat source points are arranged at two sides at the position, opposite to a weld joint, of a base plate for stirring friction welding, an array type arrangement is formed, and each heat source point is heated by utilizing a high-frequency induction coil to generate heat; and the heat source generated by the heat source point is matched with the heat generated in the friction stir welding process, the array type point-shaped heat source can generate different residual stress for different plates due to different temperature conduction rates, and then temperature control is carried out. In the welding process, the temperature distribution is generated by stirring heads in the welding process by controlling the point-shaped heat source of the array type arrangement in a simulation FSW process, so that the temperature distribution of the welded plate is uniform, the temperature gradient in the welded plate is reduced, and the residual stress generated due to thermal gradient is reduced. After the welding is completed, the heat of the heat source of the control point is controlled, so that the temperature of the welded plate is kept, and mechanical residual stress in the joint is eliminated.

Description

technical field [0001] The present invention relates to a device for friction stir welding, especially a device for effectively reducing / eliminating the residual stress of friction stir welding plates, specifically a backing plate used in friction stir welding, through which the backing plate The use can effectively reduce / eliminate the residual stress of the friction stir welding plate, and the device is especially suitable for the control of the residual stress of the friction stir welding of dissimilar plates. Background technique [0002] Friction stir welding (FSW) is a new solid-phase joining technology invented by The Welding Institute (TWI) in 1991 (US 5460317). FSW uses frictional heat as the welding heat source. In the FSW welding process, a cylindrical welding head is inserted into the joint of the workpiece. Through the high-speed rotation of the welding head, it rubs against the material of the welding workpiece, so that the material temperature of the joint El...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/26C21D9/50
CPCB23K20/1245C21D9/50Y02P10/20
Inventor 邓永芳邱哲睿刘赣华汪航
Owner JIANGXI UNIV OF SCI & TECH
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