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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 invent a method that can reduce the residual stress of the friction stir welded plates, especially the dissimilar plates, and to provide a corresponding welding backing plate device

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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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Effect test

Embodiment 1

[0027] Such as figure 1 shown.

[0028] A method that can effectively reduce / eliminate the residual stress of friction stir welded plates, the key of which is to set a number of heat source points at the position opposite to the weld seam and on both sides of the backing plate for friction stir welding to form an array arrangement, each heat source The 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 point heat source can produce different residual stress for different types of plates due to different material properties. 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 production of the heat source, keep the welding plate warm, and elimin...

Embodiment 2

[0035] Such as figure 1 shown.

[0036] It is used in friction stir welding and can effectively reduce / eliminate the residual stress of friction stir welding 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 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 are selected as the heat source points 2 along the center line of the length direction and on both sides. The diameter of the circular area is 10mm. The heat source point in the middle 2 Located at the geometric center of the surface of the backing plate, 12 heat source points 2 are arranged in an array, and the distance between the two heat source points 2 is 100mm (can also be selected between 5mm-500mm); the heat of heat source point 2 comes from high frequency The induction coil heats the cylindrical iron core 5 to gen...

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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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