Working principle of ultrasonic welding machine

Update time:23-06-2020

Principle of welding Ultrasonic welding machine princip […]

Principle of welding Ultrasonic welding machine principle: When ultrasonic waves act on the contact surface of thermoplastic plastics, it will generate tens of thousands of high-frequency vibrations per second. This high-frequency vibration with a certain amplitude will transmit ultrasonic energy to the welding zone through the upper welding parts. Because of the large acoustic resistance at the welding area, ie the interface between the two welds, local high temperatures are generated. Due to the poor thermal conductivity of the plastic, it could not be distributed in time, and it gathered in the welding area, causing the contact surface of the two plastics to melt quickly, and after a certain pressure, it was merged into one. When the ultrasonic wave stops working, let the pressure last for a few seconds to make it solidify and form, so as to form a strong molecular chain to achieve the purpose of welding. The welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on the amplitude of the transducer welding head, the applied pressure and the welding time and other three factors. The welding time and the welding head pressure can be adjusted. The amplitude is determined by the transducer and the amplitude. Rod decision. There is a suitable value for the interaction of these three quantities. When the energy exceeds the suitable value, the melting amount of the plastic is large, and the welded material is easily deformed; if the energy is small, it is not easy to weld firmly, and the applied pressure cannot be too large. This optimal pressure is the product of the optimal length of the side of the welded part and the edge per 1mm. Ultrasonic metal welding principle: The principle of ultrasonic metal welding is to use the mechanical vibration energy of ultrasonic frequency (more than 16KHz) to connect the same metal or different metal A special method. During ultrasonic welding of metals, neither current is supplied to the workpiece nor a high-temperature heat source is applied to the workpiece, but the vibration energy of the frame is transformed into friction work, deformation energy and limited temperature rise between the workpieces under static pressure. The metallurgical bonding between the joints is a kind of solid-state welding realized without melting the base metal. Therefore, it effectively overcomes the phenomena of splashing and oxidation generated during resistance welding. Ultrasonic metal welding machine can perform single-point welding, multi-point welding and short strip welding on the filaments or sheet materials of nonferrous metals such as copper, silver, aluminum and nickel. It can be widely used in the welding of thyristor leads, fuse pieces, electrical leads, lithium battery pole pieces and tabs.