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Friction stir double-rivet welding method for dissimilar alloy

A friction stir and alloy technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as complex matching, structural weight reduction, rivet type, and high shape requirements, achieving short welding time, improved bearing strength, Effect of Low Soldering Heat

Active Publication Date: 2022-03-22
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problems of this method are as follows: it is only suitable for the connection of the same material or different materials of light alloys; from the perspective of ensuring frictional heat, the rivet needs to use a material whose strength is higher than that of the welding material at high temperature to avoid friction during the riveting process. The rivets are damaged by breaking, but the high-strength rivets are not conducive to the weight reduction of the structure, and the formed riveted joints are more prone to stress concentration at the interface between the rivet and the base material due to uncoordinated deformation when subjected to external loads.
[0005] There are also friction stir riveting devices and riveting methods. The rivets serve as both the connection structure and the temporary stirring head, and can be used for riveting and welding of dissimilar alloy materials. The type and shape of the rivet require high requirements and the liner needs to be grooved, which makes the fit complicated during welding

Method used

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  • Friction stir double-rivet welding method for dissimilar alloy
  • Friction stir double-rivet welding method for dissimilar alloy
  • Friction stir double-rivet welding method for dissimilar alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A friction stir double-rivet welding method for dissimilar alloys is carried out using friction stir double-rivet welding equipment for dissimilar alloys. The schematic diagram of the structure is as follows figure 2 As shown, including the stirring head 3, the stirring head 3 has a large concave shoulder a, the concave angle of the large concave shoulder a is 14°, and the side wall of the stirring needle of the stirring head 3 is provided with a small lift angle through groove 5, The head of the stirring needle is provided with a spiral groove, which is set in this embodiment as a concave spiral groove with a depth of 0.4 mm. The schematic diagram of the three-dimensional structure of the stirring head is as follows image 3 3(a) is a front view, 3(b) is a cross-sectional view, and 3(c) is a bottom view; a schematic diagram of the local structure of the stirring head; a schematic diagram of the local structure of the stirring head is shown in Figure 4 Shown; welding ...

Embodiment 2

[0080] Same as Example 1, the difference is that the length of the stirring needle at the lower part of the shoulder is 2.0 mm, the lower tie position is located at the interface, and the vertical distance between the lower tie position and the interface is 0 mm; the obtained welded joint is as follows Figure 6 As shown, the joint tensile load is 5.45kN.

Embodiment 3

[0082] Same as Example 1, the difference is that the length of the stirring needle at the lower part of the shoulder is 2.2 mm, the lower tie position is located at the lower part of the interface, and the vertical distance between the lower tie position and the interface is 0.2 mm; the frictional heat of the upper plate on the stirring head and the upsetting Under the double action, plastic flow is generated and is extruded to form an aluminum anchor between the rivet and the lower plate material. At the same time, the lower plate material is driven by the stirring head to flow upwards and embedded into the upper plate material to form a copper anchor, which together form an aluminum anchor near the lap interface. Structure 9; the welded joint obtained as Figure 7 As shown, the joint tensile load is 6.35kN.

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Abstract

The invention relates to a friction stir double-rivet welding method for dissimilar alloy, which belongs to the technical field of dissimilar alloy material connection, is carried out by adopting friction stir double-rivet welding equipment for dissimilar alloy, and comprises the following steps of: prefabricating a through hole in a connection area by taking a low-melting-point metal material as an upper plate; a large concave shaft shoulder stirring head and a rivet made of the same material as the lower plate are adopted; connecting areas of the dissimilar metal plates are matched and fixed to a welding workbench, rivets are placed into the prefabricated holes, and stirring friction rivet welding is conducted; under the effect of heat production upsetting of the rotary stirring head, the rivet, the upper plate and the lower plate form good metallurgical connection; meanwhile, the rivet upper material is embedded into the upper plate material to form a riveting pier head, the rivet lower material warps upwards to enter the aluminum plate, and the rivet upper material and the rivet lower material jointly form an outer riveting structure; the upper plate material is extruded to the position between the rivet and the lower plate material or the lower plate material is driven into the upper plate material, and an inner riveting structure is formed near a lap joint interface; the mechanical and metallurgical bonding coexisting double-rivet joint is formed, and connection between dissimilar alloy materials is strengthened.

Description

technical field [0001] The invention belongs to metal material connection technology, in particular to a friction-stir double-riveting welding method of dissimilar alloys, which can obtain dissimilar metal riveting joints with high bearing capacity. Background technique [0002] Friction stir riveting welding (FSRW) is a new type of solid phase riveting technology derived from friction stir welding (FSW), based on the combination of friction stir welding technology and riveting technology, using friction The heat and the strong plastic flow of the material enable efficient joining of the plates and rivets. According to the research results at home and abroad, the friction stir riveting welding process has realized the connection of the same alloy plate and the dissimilar alloy plate. In the connection of the same alloy, due to the good metallurgical compatibility between the same materials, high-quality riveted joints can often be obtained. In the connection of dissimilar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K20/12B23K20/26B23K103/18
CPCB23K28/02B23K20/1255B23K20/26B23K2103/18
Inventor 姬书得左莹莹刘华马琳吕赞张芷晴宋琦龚鹏胡为
Owner SHENYANG AEROSPACE UNIVERSITY
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