1. Welding-Solid State Welding

2. Ultrasonic Welding Learning Activities View Slides; Lesson Objectives
Read Notes,
Listen to lecture
Do on-line workbook
Lesson Objectives
When you finish this lesson you will understand:
Ultrasonic Welding Definition, Characteristics, Process & Applications
Ultrasonic Power Generation
Interfacial Interactions & Dissimilar Metals Welding
Keywords: Ultrasonic Welding, Transducer, Sonotrode, Anvil

4. Definition of Ultrasonic Welding
A solid state welding process in which coalescence is produced at the faying surfaces by the application of high frequency vibratory energy while the work pieces are held together under moderately low static pressure.

5. Ultrasonic Welding Process
Clamping
force
Process Description:
Components of ultrasonic welding system include:
Transducer
Sonotrode
Anvil
Mass
wedge
Transducer
Sonotrode
tip
Typical components of an ultrasonic welding system are illustrated in the above figure. Linear ultrasonic vibrations are generated in the transducer and transferred to a sonotrode. The anvil holds the components in a fixed position and supports the clamping force.
Vibration
Weldment
Anvil
Force

6. Ultrasonic Welding Mechanism
Clamping
force
A static clamping force is applied perpendicular to the interface between the work pieces.
The contacting sonotrode oscillates parallel to the interface.
Combined effect of static and oscillating force produces deformation which promotes welding.
Mass
wedge
Transducer
Sonotrode
tip
10-75 KHz
workpiece
Anvil
Force

7. Applications of Ultrasonic Welding
Assembling of electronic components such as diodes and semiconductors with substrates.
Electrical connections to current carrying devices including motors, field coils, and capacitors.
Encapsulation and packaging.
Plastic parts

8. Friction Welding