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Friction stir welding tool for overlap joint

A technology of friction stir welding and lap joints, which is applied in the direction of manufacturing tools, welding equipment, non-electric welding equipment, etc., can solve the problems of low joint strength, inability to alleviate hook defects, hook defects, etc., to improve material flow, reduce Small vertical migration tendency, effect of hook defect size reduction

Inactive Publication Date: 2014-01-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these common tools are used to weld lap joints, serious hook-shaped defects will occur in the weld, resulting in very low joint strength (the strength coefficient is mostly below 30%), and the hook-shaped defects cannot be alleviated only by optimizing the test process parameters

Method used

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  • Friction stir welding tool for overlap joint
  • Friction stir welding tool for overlap joint
  • Friction stir welding tool for overlap joint

Examples

Experimental program
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Effect test

Embodiment

[0021] An aerospace structural part needs to involve lap joints of 5mm thick 2024 and 7075 dissimilar aluminum alloy plates. When welding the joints with ordinary cylindrical or conical threaded friction stir welding tools in the prior art, there are serious hooks in the joints. defect. Now according to the technical scheme provided by the present invention, a stirring tool suitable for this lap joint is processed.

[0022] Set the length of the stirring needle 2 as h=6mm, the cone angle 2α=16° of the truncated cone, and the (small bottom) top diameter of the truncated cone is D 2 =6mm, the diameter of the bottom (big bottom) is D 1 =2h*tanα+D 2 ≈7.7mm, the diameter of the circular concave hole 4 on the large bottom end face of the truncated cone is D 3 =0.75D 1 ≈5.8mm, depth h1=1.5mm, three arc-shaped grooves on the side of the stirring needle 2 are evenly distributed along the circumference, satisfying that the diameter of the three arc-shaped grooves 3 and the circular ...

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Abstract

The invention discloses a friction stir welding tool for an overlap joint. The friction stir welding tool is composed of a shaft shoulder and a stirring needle. The stirring needle is shaped like a frustum, the small bottom of the frustum is connected with the shaft shoulder, the end face of the large bottom of the frustum is provided with a round concave hole, and the outer surface of the frustum is provided with three arc-shaped grooves distributed in the circumferential direction. Meanwhile, the invention further discloses the stirring needle and the structures and the sizes of all parts of the shaft shoulder. When a stirring tool designed through the friction stir welding tool is adopted for carrying out friction stir overlap welding, the stirring needle of the frustum shape generates oblique upward thrust on plasticized metal around the overlap face, so that the perpendicular motion of the plasticized metal is reduced, and the perpendicular moving tendency of the overlap face is reduced. Moreover, as the concave hole and the grooves in the side face are formed in the bottom of the stirring needle, material flow in weld zones is improved, the overlap face is broken completely, and the weld metal can be mixed fully. Accordingly, the size of the hook-like defect in a weld joint obtained through welding of the tool is greatly reduced, and the strength coefficient of the joint is remarkably improved.

Description

technical field [0001] The invention belongs to the field of friction stir welding of metal materials, in particular to a novel friction stir welding tool designed for lap joints. Background technique [0002] Friction stir welding (FSW) is a new solid-phase joining technology invented by the British Welding Institute (TWI) in 1991. This technology is especially suitable for the joining of non-ferrous metals such as aluminum-magnesium alloys. The basic principle of friction stir welding is that a rotating non-consumable stirring tool (a stepped shaft composed of a shaft shoulder and a stirring needle) is inserted into the joint surface of the workpiece, and the friction between the shoulder and the workpiece generates heat and the stirring needle and the workpiece The plastic deformation of the material produces heat, and the workpiece to be welded is heated to a plasticized state, and the joint surface of the workpiece will be broken under the stirring friction of the stirr...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/1255
Inventor 宋友宝杨新岐
Owner TIANJIN UNIV
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