A method for preparing a copper-aluminum gradient alloy submarine cable welded joint

CN116571747BActive Publication Date: 2026-05-26JIANGSU OCEAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU OCEAN UNIV
Filing Date
2023-04-17
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively address the corrosion and brittle compound formation caused by electrode potential differences in copper-aluminum welded joints under high temperatures and mechanical vibrations, resulting in low weld impact toughness and easy cracking during welding of dissimilar materials.

Method used

Copper-aluminum alloy powders of different proportions were prepared by mechanical stirring. Copper-aluminum gradient alloy submarine cable welding joints were prepared by cold isostatic pressing and equal diameter angular extrusion processes, combined with heat treatment, to achieve a gradual transition in material properties.

Benefits of technology

It effectively avoids deformation and cracking caused by differences in thermal expansion coefficients during welding, improves the structural reliability and mechanical properties of welded joints, and significantly increases material density and hardness.

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Abstract

This invention discloses a method for preparing copper-aluminum gradient alloy submarine cable welding joints. Copper-aluminum alloy powders with different mixing ratios are prepared by mechanical stirring. The powder blanks arranged in a gradient are then vibrated, densified, and extruded using cold isostatic pressing (COP). After preparing the copper-aluminum gradient blanks through COP, the copper-aluminum gradient material is prepared by equal-diameter angular extrusion (ECE) and heat treatment. The COP and ECE processes used in this invention achieve controllable copper-aluminum ratios through pre-mixing. The ECE process, with deformation occurring without altering the material's cross-sectional area and shape, achieves good metallurgical bonding, transition of composition and properties, and excellent grain refinement through shearing generated by multiple deformations.
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