Explanation

Using the high-frequency oscillation energy of ultrasonic wave, under the action of pressure, the contact surface of weld parts will produce strong friction to remove the surface oxide film and realize weld by local heating. This method is usually used to assemble two weld parts into a lap joint, clamp them between the upper and lower sound poles, and apply static pressure and ultrasonic vibration through the sound poles. In plastics welding, ultrasonic vibration and static pressure are in the same direction; In metal weld, the direction of ultrasonic vibration is perpendicular to the static pressure. The vibration modes of this pressure welding method can be longitudinal vibration, bending vibration, torsional vibration, etc. If the welding spot is isolated, it is called ultrasonic sport welding, and if a continuous weld is formed, it is called ultrasonic seam welding. Compared with other weld methods, ultrasonic weld has the advantage that there is no current passing through the weld part and no external heating source, so it has little impact on the performance of the materials to be welded. The joint strength of ultrasonic weld is usually higher than that of resistance welding, and it has a wide range of applications, especially suitable for weld of materials such as metals, dissimilar metals, metals and nonmetals, and plastics with high conductivity and high thermal conductivity.

Classification