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The principle of ultrasonic welding machine

The principle of ultrasonic welding machine: When ultrasonic waves act on the thermoplastic plastic contact surface, it will produce tens of thousands of high-frequency vibrations per second. This kind of high-frequency vibration reaching a certain amplitude transmits ultrasonic energy to the welding area through the upper weldment. The weld zone, that is, the acoustic resistance at the interface of two welds, is large, so local high temperature will be generated. In addition, due to the poor thermal conductivity of the plastic, it cannot be distributed in time for a while, and it gathers in the welding area, causing the contact surface of the two plastics to melt rapidly, and after a certain pressure is applied, it merges into one.

When the ultrasonic stops, let the pressure continue for a few seconds to make it solidify and shape, so that a strong molecular chain is formed to achieve the purpose of welding, and the welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on three factors: the amplitude of the transducer’s welding head, the applied pressure and the welding time. The welding time and welding head pressure can be adjusted, and the amplitude is determined by the transducer and the amplitude. Rod decision. There is an appropriate value for the interaction of these three quantities. When the energy exceeds the appropriate 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. The best pressure is the product of the side length of the welded part and the best pressure per 1mm of the edge. Ultrasonic metal welding principle: The principle of ultrasonic metal welding is to use the mechanical vibration energy of the ultrasonic frequency (over 16KHz) to connect the same metal or dissimilar metal A special method. When metal is ultrasonically welded, neither electric current nor high temperature heat source is applied to the workpiece, but under static pressure, the vibration energy of the frame is transformed into friction work, deformation energy and limited temperature rise between the workpieces. The metallurgical bonding between the joints is a solid state welding that is achieved without the base material melting.

Therefore, it effectively overcomes the spatter and oxidation caused by resistance welding. Ultrasonic metal welding machine can perform single-point welding, multi-point welding and short strip welding on thin wires or sheets of non-ferrous metals such as copper, silver, aluminum, and nickel. It can be widely used in the welding of SCR leads, fuse pieces, electrical lead wires, lithium battery pole pieces, and tabs.

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