Can ultrasonic wave weld metal? What are the methods for welding?
Aug 23, 2022
Ultrasonic waves can weld metal. The common metal ultrasonic welding can be divided into spot welding, ring welding, seam welding and wire welding.
1. Spot welding. The ultrasonic vibration system of ultrasonic spot welding machine can be divided into longitudinal vibration (light structure) system, bending vibration (heavy structure) system and light bending vibration system according to the vibration condition of the upper sound bar. The light structure is suitable for small spot welding machines with power less than 500W, the heavy structure is suitable for kW high-power ultrasonic welding machines, and the light bending vibration system is suitable for medium and small power welding machines. Both have the advantages of two vibration systems.
2. Circular welding. The circular welding method can form a closed weld at one time, and the torsional vibration system is adopted. In the welding process, the vibration amplitude is symmetric and linear with respect to the acoustic rod axis, the amplitude in the axial region is zero, and the amplitude at the edge of the pad is the largest. Obviously, ring welding is the most suitable packaging process for microelectronic devices.
3. Wire welding. Wire welding can be regarded as an extension of spot welding. This method is to obtain a 150 mm long linear weld through the linear upper acoustic electrode. This method is suitable for linear sealing of foil.
4. Seam welding. The vibration ultrasonic system of the ultrasound seam welding machine can be divided into the following according to the vibration state of the welding pad:;
A - longitudinal vibration system;
B-bending vibration system;
C-torsional vibration system.
Among them, a and B are more commonly used. The vibration direction of the pad is perpendicular to the welding direction. And the vibration direction of C is parallel to the welding direction. Seam welding can obtain a sealed continuous weld. Usually, the workpiece is clamped between the upper and lower pads. Under special circumstances, the plate type lower acoustic pole can be used.
