The principle of ultrasonic welding produced by Hengda Ultrasonic Equipment Co., Ltd. is to convert 50/60 Hz current into 15, 20, 30 or 40 kHz electric energy through an ultrasonic generator. The converted high-frequency electric energy is again converted into mechanical motion of the same frequency through the transducer, and then the mechanical motion is transmitted to the welding head through a set of amplitude modulator devices that can change the amplitude. 

       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 to melt the plastic. Ultrasound can be used not only to weld hard thermoplastics, but also to process fabrics and films.

       The hot plate welding machine produced by Hengda Ultrasonic Equipment Co., Ltd. mainly uses a temperature-controlled heating plate to weld plastic parts. When the hot plate welding machine is welding, the heating plate is placed between the two plastic parts. When the workpiece is close to the heating plate, the plastic starts to melt. After a preset heating time has passed, the plastic on the surface of the workpiece will reach a certain degree of melting. At this time, the workpiece is separated to two sides, the heating plate is removed, and then the two workpieces are merged together. When a certain welding time and After the welding depth, the entire welding process is completed.

       The spin welding machine produced by Hengda Ultrasonic Equipment Co., Ltd. is generally used to weld two round thermoplastic parts. When the rotary friction welding machine is welding, one workpiece is fixed on the bottom mold, and the other workpiece rotates on the surface of the fixed workpiece. Since a certain pressure acts on the two workpieces, the heat generated by friction between the workpieces can melt the contact surface of the two workpieces and form a forbidden and airtight combination.