A method for preparing a carbon nanotube reinforced aluminum steel composite plate by friction stir welding and the composite plate

By pre-processing steps and serrated structures on the mating surfaces of aluminum alloy and steel base materials, and laying carbon nanotube coatings, and using a double-shoulder friction stir welding tool, the problems of low joint quality and high welding temperature in aluminum-steel connections were solved, achieving high-strength, high-toughness, and low-deformation aluminum-steel composite plate welding.

CN119703315BActive Publication Date: 2025-12-12JIANGSU HUPAN WELDING TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411823847.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2025-12-12
Estimated Expiration
2044-12-12

AI Technical Summary

Technical Problem

Existing technologies for joining aluminum alloys and steel suffer from problems such as low joint quality, substandard weld performance, high welding temperature leading to decreased strength of composite joints, and difficulty in automating the production process, posing safety hazards, especially in ships and offshore platforms.

Method used

A carbon nanotube-reinforced friction stir welding method is adopted. By pre-processing steps and serrated structures on the mating surfaces of aluminum alloy and steel base materials, and laying carbon nanotube coatings in between, the welding is carried out using a biaxial shoulder friction stir welding tool. This method ensures tight material meshing and uniform heat input, inhibits the formation of intermetallic compounds, and enhances the connection strength and toughness.

Benefits of technology

It achieves high-strength and high-toughness connection of aluminum-steel composite plates, reduces welding deformation, avoids safety hazards, simplifies welding temperature control, reduces welding equipment costs, and achieves joint performance 2-3 times that of explosively welded composite plates.

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Abstract

The application discloses a kind of carbon nanotube reinforced aluminum steel composite plate friction stir welding preparation method and composite plate, using friction stir welding to aluminum alloy base material, steel base material are welded;Before friction stir welding, pre-process in the upper and lower two end surfaces of the butt joint surface of aluminum alloy base material, steel base material respectively, and process into sawtooth shape, so that aluminum alloy base material and steel base material form complete step, the butt joint surface of aluminum alloy base material and the butt joint surface of steel base material are closely engaged;And pre-laying carbon nanotube coating in the upper and lower complete steps formed by aluminum alloy base material and steel base material;The stirring pin of the friction stir welding tool used in friction stir welding technology welding is pre-processed into sawtooth shape matched with butt joint surface.The composite plate of the application has higher performance in connection strength and toughness, and the composite plate prepared by using the application can avoid safety construction hidden danger when applied to shipbuilding and offshore platform construction, improve construction efficiency.
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Citation Information

Patent Citations

  • Method for improving quality of Al-Cu dissimilar metal friction stir welding butt joint

    CN108620762A

  • Method for preparing carbon nanotube reinforced aluminum matrix composite by utilizing double-shaft shoulder friction stir process

    CN111618534A

  • Thick plate welding stirring head and thick plate welding equipment

    CN114226950A