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Stirring friction welding method for improving aluminum copper dissimilar metal connection intensity

A technology of friction stirring and heterogeneous metals, which is applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problem of not being able to obtain high-quality Al/Cu joints, and achieve the purpose of overcoming the inhomogeneity of plastic deformation, Broad prospects for industrial promotion and the effect of improving solderability

Active Publication Date: 2012-01-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research on friction stir welding of Al / Cu dissimilar metals shows that due to the large difference in hardness and rheological properties of Al and Cu, tunnel defects often exist in Al / Cu joints welded by conventional friction stir welding (Materials Research Innovations, Vol.2, No.3(1998)pp.150-163), unable to obtain high-quality Al / Cu joints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Friction stir welding was performed on Al and Cu plates using a stirrer with a diameter of 8 mm, the welding tool was biased to the Al side, the bias amount was 3.5 mm, the tool speed was 800 r / min, and the welding speed was 100 mm / min. Macroscopic and microscopic inspections show that the surface of the weld is relatively smooth, and the interior is dense and free of defects. Tensile experiments show that the fracture of the joint occurs on the Al side, and the Al / Cu junction does not crack when stretched. The joint does not crack when bent over 120°.

Embodiment 2

[0017] Friction stir welding was performed on the Al and Cu plates using a stirrer with a diameter of 5 mm, the welding tool was biased to the Cu side, the bias amount was 2.5 mm, the tool speed was 1000 r / min, and the welding speed was 100 mm / min. The microstructure inspection shows that the surface of the weld is relatively smooth, and the interior is dense and free of defects. Tensile experiments show that the fracture occurs on the Al side, and the Al / Cu junction does not crack when stretched.

Embodiment 3

[0021] Friction stir welding was performed on Al and Cu plates using a stirrer with a diameter of 8 mm, the welding tool was biased to the Al side, the bias amount was 1 mm, the tool speed was 1000 r / min, and the welding speed was 100 mm / min. The microstructure inspection shows that the surface of the weld is relatively smooth, and the interior is dense and free of defects. Tensile experiments show that the fracture occurs on the Al side, and the Al / Cu junction does not crack when stretched.

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Abstract

The invention provides a stirring friction welding method for improving the aluminum copper dissimilar metal connection intensity. The stirring friction welding is carried out on aluminum copper dissimilar metal plates under the condition of bias placement of welding tools, the flowability of the materials can be improved, and the aluminum copper connection intensity can be improved.

Description

technical field [0001] The invention relates to metal materials, and in particular provides a friction stir welding method for improving the connection strength of aluminum-copper heterogeneous metals, which is suitable for the connection of aluminum-copper heterogeneous metal plates. Background technique [0002] Cu and Al are widely used in electronics, refrigeration and power transmission and transformation industries. Although the thermal conductivity and electrical conductivity of Al are slightly lower than that of Cu, Al is light in weight and cheap in price. Considering the comprehensive factors such as electrical conductivity, thermal conductivity, density and price of Al and Cu, on the premise of satisfying the electrical and thermal conductivity, replacing Cu with Al can save at least about 50% of the material cost, so replacing Cu with Al can greatly reduce The cost of materials is very high, and it has extremely high economic benefits. [0003] Substituting Al ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K103/18
Inventor 马宗义倪丁瑞薛鹏肖伯律王东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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