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

A friction stir, dissimilar metal technology, used in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problem of inability to obtain high-quality Al/Cu joints, and achieve to overcome the non-uniformity of plastic deformation, The effect of reducing welding defects and broad prospects for industrial promotion

Active Publication Date: 2010-06-30
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 is performed on Al and Cu plates with a stirring diameter of 8mm, the welding tool is offset to the Al side, the offset is 3.5mm, the tool speed is 800r / min, and the welding speed is 100mm / min. Macroscopic and microscopic inspections show that the surface of the weld is relatively smooth, and the interior is dense and without defects. The tensile test shows that the joint fracture occurs on the Al side, and the Al / Cu joint does not crack when it is stretched. If the bending exceeds 120°, the joint will not crack.

Embodiment 2

[0017] Friction stir welding is performed on Al and Cu plates with a stirring diameter of 5mm, the welding tool is offset to the Cu side, the offset is 2.5mm, the tool speed is 1000r / min, and the welding speed is 100mm / min. The microstructure inspection showed that the surface of the weld was relatively smooth, and the interior was dense without defects. The tensile test shows that the fracture occurs on the Al side, and the Al / Cu junction does not crack when it is stretched.

Embodiment 3

[0021] Friction stir welding is performed on Al and Cu plates with a stirring diameter of 8mm, the welding tool is offset to the Al side, the offset is 1mm, the tool speed is 1000r / min, and the welding speed is 100mm / min. The microstructure inspection showed that the surface of the weld was relatively smooth, and the interior was dense without defects. The tensile test shows that the fracture occurs on the Al side, and the Al / Cu junction does not crack when it is stretched.

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PUM

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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 a metal material, and in particular provides a friction stir welding method for improving the connection strength of aluminum and copper heterogeneous metals, which is suitable for the connection of aluminum and 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 lighter and cheaper. Taking into account the electrical conductivity, thermal conductivity, density, and price of Al and Cu, under the premise of meeting 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 Material cost has extremely high economic benefits. [0003] Substituting Al for part of Cu for manufacturing parts makes high-quality conne...

Claims

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Application Information

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Patent Type & Authority Applications(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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