Stirring friction diffusion welding method used for connection of dissimilar materials

A friction stir, dissimilar material technology, applied in welding equipment, non-electric welding equipment, edge parts of workpieces, etc., can solve the problem of high cost, achieve the effect of low cost, high quality combination, and reduce preparation quality requirements

Inactive Publication Date: 2012-11-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing diffusion welding technology

Method used

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  • Stirring friction diffusion welding method used for connection of dissimilar materials
  • Stirring friction diffusion welding method used for connection of dissimilar materials
  • Stirring friction diffusion welding method used for connection of dissimilar materials

Examples

Experimental program
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Embodiment 1

[0034] The invention provides a friction stir diffusion welding method for connecting aluminum alloy and stainless steel, comprising the following steps:

[0035] A. Ni powder and Cu powder are mixed uniformly, are prepared into spraying liquid, adopt the mode of thermal spraying to spray described spraying liquid onto the welding face of described stainless steel plate 2, form the Ni-Cu coating that thickness is 100 μm, described Ni-Cu coating as the intermediate layer material of aluminum alloy and stainless steel3;

[0036] B. Put together the stainless steel plate 2 and the aluminum alloy plate 1 through step A to form a butt joint, see figure 1 ;

[0037] C. Rotate the stirring head and insert it into the joint to be welded, and generate heat by friction with the joint to be welded, and keep it warm for a period of time. Composition changes to carry out isothermal solidification and composition diffusion and homogenization, and finally form a joint of continuous metallu...

Embodiment 2

[0043] This embodiment provides a friction stir diffusion welding method for connecting aluminum plates and stainless steel plates and includes the following steps:

[0044] A. The stainless steel plate 2 and the aluminum plate 1 are combined to form a horizontal lap joint, and the aluminum plate 1 and the stainless steel 2

[0045] Each has an inclined horizontal lap interface, the horizontal inclination angle θ of the horizontal lap interface of the aluminum base material and the horizontal inclination angle of the horizontal lap interface of the stainless steel base material are complementary angles to each other, and the two pass through the lap interface mated to form the horizontal lap joint, see figure 2 ;

[0046]B. Add a metal sheet made of nickel between the aluminum plate 1 and the stainless steel plate 2 as a middle

[0047] The interlayer substance 3, the thickness of the interlayer substance 3 is 700 μm;

[0048] C. Rotate the stirring head and insert it i...

Embodiment 3

[0054] This embodiment provides a friction stir diffusion welding method for connecting an aluminum plate and a titanium plate, comprising the following steps:

[0055] A. The titanium plate 2 and the aluminum plate 1 are put together to form a horizontal lap joint, and the aluminum plate 1 and the titanium plate 2 respectively have an inclined horizontal lap interface and a vertical lap with a height h on the horizontal lap interface interface, the horizontal inclination angle θ of the horizontal lap interface of the aluminum plate 1 and the horizontal inclination angle of the horizontal lap interface of the titanium plate 2 are complementary angles, and the two form the horizontal lap joint after cooperating through the lap interface connector, see image 3 ;

[0056] B. Adding a metal foil made of nickel as an intermediate layer between the aluminum plate 1 and the titanium plate 2

[0057] Substance 3, here, the intermediate layer substance 3 can also be added in the for...

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Abstract

The invention provides a stirring friction diffusion welding method used for connection of dissimilar materials, and is characterized by comprising the following steps: stirring friction welding and diffusion welding are combined, heat generated by stirring friction is taken as a heat source of diffusion welding, and a stirring head is continuously moved in a welding process so as to move a heat source, thus joints to be welded are welded at different regions, a fixation device is unnecessary to be separated provided in the welding process, and the joints to be welded in all kinds of shapes and sizes can be welded, so that the vices of increased cost and easiness in limiting the sizes and the shapes of the joints to be welded by the welding device due to a need of separately setting the fixation device to provide the heat source in the prior art can be avoided, and the stirring friction diffusion welding method has the advantages of low cost and wide application range.

Description

technical field [0001] The invention relates to a friction stir diffusion welding method used for connecting dissimilar materials, and belongs to the field of welding technology. Background technique [0002] The development of new materials has made the composite structure of dissimilar materials have great application prospects in aerospace, aviation, automobile and other industrial fields. In recent years, in the application of dissimilar materials, the problems of these materials themselves or their connection with other materials are often encountered. Some new materials, such as ceramics, composite materials, intermetallic compounds, amorphous materials, single crystal alloys, etc., can be welded The reliability is poor, and the traditional fusion welding technology often cannot be welded or the mechanical properties of the welded joint are poor. [0003] At present, diffusion welding has become the main method for welding dissimilar materials. Diffusion welding is t...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/22B23K33/00
Inventor 张华张贺吴会强黄继华赵兴科陈树海
Owner UNIV OF SCI & TECH BEIJING
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