Ultrasonic welding

Ultrasonic welding is a welding technology that utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, frictional heat is generated at the contact surface, causing instantaneous fusion. It features high speed, low energy consumption, no need for adhesives, and high welding strength, and is widely used in industries such as automotive, electronics, medical, and packaging.

Principle of Ultrasonic Welding

The basic principle of ultrasonic welding is to use high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the two surfaces rub against each other, resulting in molecular-level fusion. The specific process is as follows:

Energy Conversion: The ultrasonic generator converts 50/60 Hz current into 15, 20, 30, or 40 KHz electrical energy.
Mechanical Motion: The converted high-frequency electrical energy is again converted into mechanical motion of the same frequency by a transducer.
Energy Transmission: The mechanical motion is transmitted to the welding head through an amplitude-changing device.
Friction and Heat Generation: The welding head transmits the received vibration energy to the joint of the workpiece to be welded. In this area, the vibration energy is converted into heat energy through friction, melting the area of ​​the parts to be welded.
Application Fields of Ultrasonic Welding
Automotive Industry: Ultrasonic welding equipment is widely used in various parts of automobiles, such as interior trim parts, electronic components, and intake systems. For example, storage boxes, instrument panel components, and door panel inserts in car interiors often use ultrasonic welding for seamless joining, ensuring aesthetics and strength.
Electronics and Electrical Appliances Industry: Plastic casings of electronic products (such as remote controls, smart home devices), and internal structural components (such as connectors, wire harness fixing seats) have extremely high requirements for welding precision and appearance. Ultrasonic welding can achieve precise and clean connections without overflow, avoiding thermal damage to internal precision components.
Medical and Packaging Industry: For some medical device plastic parts, liquid filtration equipment (such as end cap welding of filter elements), and special packaging that require sterile and contamination-free connections, ultrasonic welding provides a clean and efficient packaging method.