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Friction-stir welding tool and method of repairing key hole defect by using friction-stir welding tool

A technology of friction stir welding and tools, which is applied in the direction of manufacturing tools, welding equipment, non-electric welding equipment, etc. It can solve the problem of not fundamentally eliminating volume defects, thinning the repair area of ​​metal components, and difficult to repair keyhole defects, etc. problem, to achieve the effects of easy control of material flow at the interface, lower temperature, and promotion of plastic flow and atomic diffusion

Active Publication Date: 2017-05-17
青岛新动航空科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The method of arc preheating friction stir plug repairing welding disclosed in CN101966621B patent document and the method disclosed in CN102500915A patent document adopt T-shaped filler block and needleless stirring head to fill the method of friction stir welding keyhole, both adopt the mode similar to filler block to carry out keyhole welding. The hole defect repair is limited by the thickness of the plate. It is difficult to repair the keyhole defect of the thick plate with large depth by these two methods; in addition, the repair interface is prone to metallurgical bonding, which will reduce the performance of the welded joint
The disadvantage of these two methods is that new keyhole defects will appear after friction stir welding, and the volume defects are not fundamentally eliminated
[0011] The CN103212778A patent document discloses a crack repair method based on friction stir, which only uses a needleless stirring head to repair the defects near the surface of the metal material, but fails to realize the repair along the depth direction of the plate, and the thickness of the repair area of ​​the metal component will be thinned, resulting in Stress concentration, reduced fatigue life of joints

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  • Friction-stir welding tool and method of repairing key hole defect by using friction-stir welding tool

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Embodiment Construction

[0041] The present invention will be further described below with reference to the drawings and embodiments.

[0042] Combine Figure 1 to Figure 4 , The friction stir tool of the present invention includes a stirring head 1 and a static shoulder 4 matched with the stirring head. There are six spiral grooves 9 on the bottom surface of the stirring needle 8 of the stirring head. The maximum curvature radius ρ, arc length L and width b of the six spiral grooves are respectively 0.7 times, 0.5 times and 0.1 times of the diameter of the stirring needle. The stationary shaft shoulder is in the shape of a truncated cone with a large top and a small bottom. Its inner diameter is 0.1~0.3mm larger than the diameter of the stirring head shoulder 7 of the stirring head, the lower end outer diameter is 5-10mm larger than the inner diameter, and the upper outer diameter is 20-50mm larger than the inner diameter. Height and details of mixing head ( figure 1 The middle stirring head is located...

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Abstract

The invention discloses a friction-stir welding tool which is characterized in that a six-helix groove is formed in the bottom surface of a stirring needle of a stirring head; a stationary shaft shoulder is connected with shaft shoulder fixing blocks through springs; the shaft shoulder fixing blocks are fixedly arranged on a welding machine; an electric heating device and a cooling medium passage are arranged and formed in the stationary shaft shoulder; and the electric heating device is arranged inside, close to the stirring head and the cooling medium passage is outside the electric heating device. When the friction-stir welding tool is used to repair a key hole defect, a key hole of a to-be-repaired workpiece is processed to be cylindrical, then continuous filling repair is carried out on the cylindrical key hole by using the stirring heads, the stationary shaft shoulders and filling pieces in different sizes. Compared with the prior art, the friction-stir welding tool has the beneficial effects that the grain size of a repair area is fined, the metallurgical bonding property and the mechanical property are good, the strength is high, the thickness of the repair area is not reduced, no material is spilled, the stress concentration phenomenon is few, and the friction-stir welding tool is free from defect depth limitation and is wide in application scope.

Description

Technical field [0001] The invention relates to metal welding, in particular to a friction stir welding tool and a method for repairing keyhole defects with the tool. Background technique [0002] As a new type of solid phase welding method, friction stir welding has the advantages of low welding temperature, low deformation and residual stress, and high quality of welded joints. It has been widely used in aerospace, high-speed rail and shipbuilding. During the welding process, a friction stir welding tool consisting of a specially designed shoulder and a stirring head is inserted into the metal component, and friction heat is generated by friction with the metal component, which makes the material flow and realizes the connection of the metal component to be welded. [0003] During the friction stir welding process, due to the existence of the stir needle, a keyhole defect will appear at the end of the welded joint. This keyhole defect will cause weak connections and stress concen...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/1215B23K20/122B23K20/1255B23K20/24
Inventor 姬书得孟祥晨张利国刘震磊黄若飞吕赞
Owner 青岛新动航空科技发展有限公司
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