Ultrasonic metal welding is a special processing technology that has been widely used in industry since it was invented by Americans in 1950. In recent years, ultrasonic metal welding technology, as a new and special welding technology, has been widely used in industrial production, showing its unique advantages that are different from conventional welding.
Ultrasonic Metal Welding is a special welding method for connecting the same or dissimilar metals, semiconductors and metal-ceramics under the combined action of mechanical vibration energy and static pressure of ultrasonic frequency (16~80KHZ). During ultrasonic welding of metal materials, neither current is supplied to the workpiece nor a high-temperature heat source is introduced into the workpiece, but the elastic vibration energy is converted into friction work and deformation energy between the workpieces under the action of static pressure, and the subsequent limited temperature rise, so that the two The metal surfaces rub against each other to form a fusion between the molecular layers. Bonding between joints is achieved without melting the base metal, producing no fumes and no odor. Ultrasonic welding is widely used in automobile and mobile phone manufacturing, solar water heater heat pipe welding, electronic appliances, aerospace and nuclear energy industries.
Ultrasonic metal welding machines are usually composed of ultrasonic generators, acoustic systems, pressurizing mechanisms and program-controlled devices.
Ultrasonic welding converts electrical current into electrical energy through an ultrasonic generator. The transducer converts the converted high-frequency electrical energy into mechanical vibration of the interface, which is then transmitted to the welding head through a set of horn devices that can change the amplitude. The welding head then transmits the received ultrasonic vibration energy to the workpiece to be welded, causing relative displacement of the upper and lower workpieces. (On the one hand, the oxide film on the contact interface can be removed; on the other hand, the ultrasonic energy is gradually transmitted to the workpiece, and the workpiece is subsequently transformed from "point contact" to "line contact", so that the effective bonding area between the workpieces gradually becomes larger.) Under the combined action of high-frequency ultrasonic vibration and static pressure, the mechanical vibration energy of the workpiece is converted into plastic flow, friction work and thermal energy at the interface, and the interface atoms are activated and interdiffused, thereby realizing the solid-state connection of the workpiece.