How to ensure the long-term conductive reliability of Silver Contact Terminal Assembly through brazing?

Brazing relies on the melting of a low-melting-point filler metal, which fills the joint gap through capillary action. A reliable metallurgical connection is formed through mutual diffusion between the base material and the filler metal. It is the mainstream forming process for electronic conductive components. Silver Contact Terminal Assembly has stringent requirements for the flatness of the conductive joint and the stability of the connection. The low deformation and no thermal damage to the base material characteristics of brazing are perfectly suited to the precision machining requirements of the assemblies, making it more suitable for mass production of thin-walled conductive components compared to high-temperature fusion welding.

Brazing is classified according to heating temperature into low-temperature soft brazing, medium-temperature brazing, and high-temperature hard brazing, using various heating methods such as flame, induction, and furnace. Different processes are suitable for different workpiece specifications. Electrical Contact Riveting Assembly mostly uses low-temperature or medium-temperature brazing processes, which ensure that the silver layer is not burned off by high temperatures and can stably achieve a sealed connection between the terminal and the contact. Induction brazing heats up quickly and forms a uniform joint, making it the preferred heating solution for mass production of silver contact terminals.

The joint structure design directly determines the current-carrying capacity and fatigue resistance of conductive terminals. Lap joints and interlocking structures are commonly used to enhance joint strength. The standard lap length is 3 to 4 times the plate thickness, with a maximum of 15 mm. Riveted Contact Terminal Assembly uniformly adopts a precision lap joint structure, strictly controlling the assembly gap at the soldering temperature. The gap size matches the capillary flow characteristics of silver-based solder, avoiding failures such as poor conductivity and intermittent connections caused by abnormal gaps.

Solder alloys compatible with conductive components need to possess excellent conductivity and wettability. Silver-based and tin-based solders are the mainstream choices for contact terminal processing, with melting temperatures much lower than copper and silver base materials, allowing for uniform spreading and filling of gaps at high temperatures. Silver Bimetal Rivet Stamping Part prioritizes low-impurity conductive solders to prevent harmful elements from corroding the silver contact surface, balancing joint mechanical strength and long-term stable conductivity, while controlling the proportion of precious metals used to balance product costs.

The complete brazing process comprises five major steps: surface pretreatment, workpiece positioning, solder placement, temperature-controlled welding, and post-weld cleaning. Pretreatment removes oil and oxide layers from the terminals, ensuring the solder adheres well to the silver contact surface. The entire Electrical Contact Assembly process utilizes precise tooling positioning, strictly controlling welding temperature and holding time. Post-weld cleaning thoroughly removes flux residue to prevent corrosion of the contacts, ensuring no increase in contact resistance under long-term energized conditions.

Compared to traditional welding processes, brazing results in minimal deformation of conductive terminals, does not damage the conductive plating of the silver contacts, and allows for a stable connection of dissimilar metal terminals. The process is compatible with various internal conductive components in switches and relays. Leveraging standardized brazing processes, the Silver Contact Riveted Copper Assemblies achieve a high degree of uniformity in size and conductivity across batches of products, significantly reducing the probability of subsequent component contact failures. It is a mature and reliable manufacturing solution for precision conductive components in low-voltage electrical applications.

Most commercially available silver contact terminals are prone to defects such as silver layer loss, poor solder joint connection, and resistance drift over long-term use. Our self-developed and mass-produced Silver Contact Terminal Assembly employs a complete set of standardized precision brazing processes, accurately controlling gaps, temperature, and solder ratios to fully protect the silver contact plating. It offers stable current-carrying capacity, vibration resistance, and fatigue resistance. Customized dimensions and brazing solutions are available for relay and switch applications, fully complying with electrical industry reliability testing standards. We welcome inquiries regarding samples and bulk purchases. Please bring your product drawings and performance requirements.