Design method for transition layer for joining dissimilar materials

By designing multi-component transition layer materials and controlling the gradients of cell parameters and thermophysical parameters, the problem of brittle intermetallic compound formation in dissimilar material welding was solved, achieving reliable connection and performance improvement of dissimilar materials.

CN122174510APending Publication Date: 2026-06-09SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU UNIV
Filing Date
2026-05-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies, brittle intermetallic compounds are generated at the interface during the welding of dissimilar materials, which affects the structural strength of the joint and makes it difficult to meet the stringent conditions of industrial applications.

Method used

Thermodynamic software is used to calculate the cell parameters and thermophysical properties of dissimilar materials, and a multi-component transition layer material is designed. By controlling the types and contents of components, a gradient of cell parameters and thermophysical properties is formed, which suppresses the formation of brittle intermetallic compounds or solid solutions, thus achieving reliable connection of dissimilar materials.

Benefits of technology

It effectively inhibits the formation of brittle intermetallic compounds, improves the strength and toughness of welded joints, reduces residual stress levels, and enhances the corrosion resistance and fatigue performance of the joints.

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Abstract

The present application relates to the design method of transition layer for connecting dissimilar materials, and belongs to the dissimilar metal welding technical field.The design method of the present application comprises the following steps: S1, using the thermodynamic software to calculate the cell parameters and the thermal physical parameters of the dissimilar materials to be welded, and determining the gradient interval; S2, using the accurate Muffin-Tin track-coherent potential approximation method to design and screen out the transition layer materials meeting the requirements; S3, regulating and controlling the component types and contents of the transition layer and dividing into several layers; S4, arranging and combining according to the gradient interval, forming the cell parameters and the thermal physical parameters gradient; S5, carrying out the welding connection.Through the design of the multi-layer transition layer, the reliable connection of the large-difference dissimilar materials is realized.At the same time, by reducing the composition gradient of the transition layer, the thermal physical parameter gradient difference and the residual stress level in the welded joint are effectively reduced, and the corrosion resistance and fatigue performance of the joint are improved.
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