Principle of ultrasonic welding Brief introduction of ultrasonic welding

At present, the welding technology is very developed. At present, the most popular is ultrasonic welding, which uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. When the surfaces of the objects are under pressure, the surfaces of the two objects rub against each other to form a fusion between molecular layers. Now there are two kinds of common ultrasonic welding: ultrasonic welding and ultrasonic metal welding, and the technology of ultrasonic welding is also very accurate. Then we will tell you something about ultrasonic welding, hoping to help you.

Brief introduction of ultrasonic welding

Ultrasonic welding is to convert the current of 50/60 Hz into 15, 20, 30 or 40 through an ultrasonic generator. KHz？ Electric energy. The converted high-frequency electric energy is converted into mechanical motion with the same frequency again through the transducer, and then transmitted to the welding head through a set of horn devices. The welding head transfers 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, which makes the plastic melt. Ultrasonic can be used not only for welding hard thermoplastics, but also for processing fabrics and films.

Ultrasonic plastic welding principle

When ultrasonic waves act on the contact surface of thermoplastic, it will produce tens of thousands of high-frequency vibrations per second. This high-frequency vibration with a certain amplitude will transfer ultrasonic energy to the welding area through the upper weldment. Due to the large acoustic resistance in the welding area, that is, the interface between two welds, local high temperature will occur. Due to the poor thermal conductivity of plastics, they could not be distributed in time and gathered in the welding area, which led to the rapid melting of two plastic contact surfaces, and after a certain pressure, they merged into one. When the ultrasonic wave stops working, let the pressure last for a few seconds to make it solidify and shape, so as to form a solid molecular chain and achieve the purpose of welding, and the welding strength can be close to the strength of raw materials. The quality of ultrasonic plastic welding depends on the amplitude of the horn, the applied pressure and the welding time. The welding time and horn pressure can be adjusted, and the amplitude is determined by the transducer and horn. The interaction of these three quantities has a suitable value. When the energy exceeds an appropriate value, the melting amount of plastic is large, and the welded object is easy to deform. If the energy is small, it is not easy to weld firmly, and the external pressure should not be too large. The optimum pressure is the product of the side length of the welded part and the optimum pressure per 1 mm edge.

The principle of ultrasonic metal welding is to use ultrasonic frequency (16KHz or above? ) is a special method to connect the same metal or dissimilar metal. When ultrasonic welding metal, neither current nor high-temperature heat source is applied to the workpiece, but only under static pressure. The vibration energy of wire frame is converted into friction work, deformation energy and finite temperature rise between workpieces. Metallurgical bonding between joints is a kind of solid-state welding that does not melt the base metal, so it effectively overcomes the splash and oxidation caused by resistance welding. Ultrasonic metal welding machine can weld thin wires or sheets of non-ferrous metals such as copper, silver, aluminum and nickel by single point welding, multi-point welding and short strip welding. It can be widely used in SCR leads, fuse pieces, electrical leads, etc.

The above is the ultrasonic welding that Bian Xiao told you. I think you should have a good understanding of ultrasonic welding after reading it. Ultrasonic welding machine is actually an advanced welding method, which can be mainly divided into welding method, riveting welding method, inlay, forming spot welding and so on. Moreover, the biggest difference between ultrasonic welding and traditional welding is that the precision of ultrasonic welding is very high and the stability after welding is also very good, so most industries now adopt ultrasonic welding.

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