Special Feature on "Dissimilar Metal Joining Technology" Resistant to Corrosion and Galvanic Corrosion
Special Feature on "Dissimilar Metal Joining Technology" Resistant to Corrosion and Galvanic Corrosion
I would like to replace some of the materials used in busbars and heat sinks with aluminum, but I believe there are various challenges behind this, such as soaring metal prices, weight reduction, and thermal conductivity. This time, I would like to introduce a dissimilar metal joining technology that is resistant to galvanic corrosion and corrosion, which can also be used for busbars. In particular, the joining of "copper" and "aluminum" is considered technically difficult, as intermetallic compounds that hinder the transfer of heat and electricity can form, and corrosion due to potential differences can occur. These challenges become barriers when considering weight reduction and cost reduction. By closely bonding dissimilar metals at the molecular level, we can suppress the occurrence of such problems. What is this joining method? This time, I will propose the following construction methods and materials.
basic information
■ FSW (Friction Stir Welding) A dedicated tool is attached to a machining center, and metals are "stirred" at the molecular level through friction. Since it can join without melting, high joint strength can be achieved. It is also characterized by its ability to handle workpieces of any size. * Minimal heat impact, achieving high-quality joints * High joint strength and excellent reliability ■ Ultrasonic Metal Joining * No solder or welding materials required * High-quality joining of dissimilar metals * Low electrical resistance at the joint, achieving high conductivity ■ Clad Materials Long materials (coils) are stacked and continuously bonded together to the desired thickness and width. The interface between dissimilar metals is diffusion-bonded, eliminating concerns about delamination. * Coil-shaped clad materials bonded from two or more types of metal * Contributes to the integration of parts and reduction of processes * Special dissimilar material cladding arranged in a strip on a coil-shaped substrate is also possible.
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Applications/Examples of results
Battery cases for EVs, bus bars, battery terminals, semiconductor manufacturing equipment, power module and inverter components, wire harness processing, high-voltage cable terminal connections, metal tube connections, connector terminals, relay and switch components, terminals for secondary batteries, lead frames, sensor components, automotive electrical components.
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Our company is a specialized trading firm that provides various materials primarily in the home appliance, automotive, information and communication, eco, and energy industries. We will celebrate our 80th anniversary in February 2026. In addition to a wide range of products such as electrical and electronic materials, chemical materials, metal materials, synthetic resin raw materials, industrial films, and molded products, as well as various types of wires and wire processed products, we also offer proposals for processing and assembly that combine various materials. Recently, we have been focusing on technical support solutions and development solutions, and we hope to be of service to you as your electronics solution partner.