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Multi-legged friction-stir welding method for improving properties of welding seam

A technology of friction stir welding and welding method, which is applied in the direction of welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of increasing industrial production costs, increasing processing procedures, etc., to reduce residual stress, improve weld performance, grain refinement effect

Inactive Publication Date: 2009-10-21
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

For the friction stir welded joints of large plates, in addition to a downward pressure on the weld, flashes are formed on both sides of the shoulder due to the throwing of plastic materials. In practical engineering applications, the process of eliminating flashes means increasing the processing procedures. increase the cost of industrial production

Method used

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  • Multi-legged friction-stir welding method for improving properties of welding seam
  • Multi-legged friction-stir welding method for improving properties of welding seam
  • Multi-legged friction-stir welding method for improving properties of welding seam

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Embodiment Construction

[0017] Such as figure 2 and image 3 As shown, the multi-legged friction stir welding stirring head that can improve the weld performance of the present invention includes at least one front stirring head 4 for stirring welding to form a weld seam and at least one behind the front stirring head 4 The rear stirring head 5 is used for rotating and extruding the weld seam and base metal. In this embodiment, there is one front stirring head 4 and two rear stirring heads 5 . The two rear stirring heads 5 are arranged symmetrically behind the front stirring head 4 . The front stirring head 4 includes a stirring probe 1 , a shaft shoulder 2 and a clamping part 3 , and the rear stirring head 5 has no stirring probe and only includes a shaft shoulder 2 and a clamping part 3 .

[0018] When performing friction stir welding, the welding seam is formed by stirring welding with the front stirring head 4 , and then the welding seam and the base material are rotated and extruded by the r...

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Abstract

The invention discloses a multi-legged friction-stir welding method for improving properties of a welding seam. After the welding seam is formed by stir welding by a front stirring head, the welding seam and a mother plate are rotated and squeezed by a back stirring head. The multi-legged stirring head can not only ensure smooth welding process, but also carry out rotation and squeeze to the welding seam, and smooth transition is realized between the welding seam and the mother plate so as to reduce stress concentration to the lowest or even zero. By adopting the multi-legged stirring head, smooth transition can be realized between the welding seam and the mother plate, thus eliminating the thickness difference which is peculiar to FSW.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a multi-legged friction stir welding welding method which can improve the performance of the weld seam. Background technique [0002] Friction stir welding (FSW: Friction Stir Welding) has high welding quality and has been widely used in aerospace, vehicle, shipbuilding and other industries. However, due to its own welding characteristics, it also has certain shortcomings. For example, the weld seam of the welded joint will generally produce a downward pressure, and the geometric dimension of the downward pressure will vary according to the thickness of the plate, generally about 0.05-0.8mm, which makes the stress concentration in the transition area between the weld seam and the base metal, thus become the weak link of welded joints. For the friction stir welded joints of large plates, in addition to a downward pressure on the weld, flashes are formed on both sides of the shou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/26C21D8/00
Inventor 张华吴会强黄继华赵兴科
Owner UNIV OF SCI & TECH BEIJING
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