Diffusion Welding Metallurgical Bonding Method For Bimetallic Terminals

In the field of high-performance electrical connections, the diffusion welding metallurgical bonding method of bimetal cable lug is widely used as a reliable metal bonding technology in the manufacture of precision connection components. Through the diffusion of metal atoms at high temperatures, a strong bond is achieved between two different metals, providing stable conductivity and mechanical strength to the terminals.

Diffusion Welding Process Characteristics

The core of diffusion welding lies in controlling temperature, pressure, and time parameters to induce microstructural changes at the bimetal terminal lug interface. Excessive temperature can cause over-softening of the metal matrix, while insufficient temperature may lead to discontinuous bonding layers. Pressure promotes atomic migration during welding and also affects the formation of interface voids and microcracks. Time parameters control the diffusion layer thickness, directly affecting the uniformity of the bond and the intermetallic adhesion.

• Temperature Control: Different welding temperatures are set according to metal combinations such as copper and nickel, and copper and aluminum.

• Pressure Application: Uniform compression achieves a tight interface.

• Time Adjustment: The bonding layer thickness is controllable within the range of tens of micrometers.

Interface Microstructure Analysis

The bimetallic lugs price interface after diffusion welding exhibits obvious metallurgical bonding characteristics. Metal grains gradually extend along the interface, forming a continuous intermetallic solid solution layer. The thickness of this bonding layer is affected by welding conditions and can be precisely measured using scanning electron microscopy and energy dispersive spectroscopy.

• Grain morphology: The interface grain orientation is coordinated with the base metal grains.

• Solid solution distribution: Uniform distribution avoids localized stress concentration.

• Interface integrity: The continuous bonding layer ensures the long-term stability of the terminal.

Diffusion welding metallurgical bonding has become a standardized process in the manufacture of bimetallic terminals, providing controllable parameters and repeatable quality levels for industrial production. Through precise temperature, pressure, and time management, the microstructure of the bonding layer can be kept consistent, enabling precise control over terminal reliability and consistency testing.