The quality of welding depends on the product itself, and there are different types of welding machines on the market, plastic welding machines and metal welding machines. What is the difference between them?
1. Ultrasonic plastic welding machine
When ultrasonic waves act on the thermoplastic contact surface, it generates thousands of high-frequency vibrations every second. This high-frequency vibration reaches a certain amplitude and transmits ultrasonic energy to the welding area through the upper welding part. Because the welding area, that is, the sound insulation of the two welding interfaces, will generate local high temperature. Due to the poor thermal conductivity of plastics, they cannot be distributed in time for a period of time and gather in the welding area, causing the contact surfaces of the two plastics to melt rapidly, and a certain pressure is applied to combine them into one. When the ultrasonic stops, let the pressure continue for a few seconds to make it solidify, thereby forming a stronger molecular chain 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 the amplitude of the welding joint of the transducer, additional pressure and welding time. The welding time and welding head pressure can be adjusted, and the amplitude is determined by the transducer and amplitude bar. The interaction of these three quantities has an appropriate value. When the energy exceeds the appropriate value, the amount of plastic melting is large and the welding material is easy to deform; when the energy is small, it is difficult to weld and the pressure cannot be too large. This optimal pressure is the product of the side length of the weldment and the optimal pressure per 1mm of the side.
2. Ultrasonic metal welding machine
The principle of ultrasonic metal welding is a special method that uses the mechanical vibration energy of ultrasonic frequency (over 15KHz) to connect the same metal or dissimilar metals. When ultrasonic welding metal, neither electric current nor high temperature heat source is applied, but under static pressure, the vibration energy of the wire rope frame is converted into friction work, deformation energy and limited temperature rise between the workpieces. The metallurgical bonding between the joints is a solid-state welding that does not melt the base material, which can effectively overcome the splash and oxidation phenomenon caused by resistance welding. Ultrasonic metal welding machine can perform single spot welding, multi-spot welding and short strip welding on non-ferrous metal thin wire or sheet materials such as copper, silver, aluminum, and nickel. Can be widely used for welding thyristor leads, fuses, electrical leads, lithium battery electrodes and ears.
