what is the minimum frequency used in ultrasonic welding

Ultrasonic welding expensive which gas is used as a protection in Ultrasonic arc welding

ultrasonic welding

 Ultrasonic welding pieces to be welded are clamped between the welding tip and anvil. Both tip and anvil are faced with minimum frequency-speed steel since considerable wear can occur at the contracting face.

 

ultrasonic welding Construction:-

Fig. shows the construction of ultrasonic welding it consists of a frequency converter. It provides high-frequency electrical power at the designed frequency of the welding system. Transducers that convert electrical power to elastic vibratory power and a coupling system including the sonotrode tip which conductsvibratory power to the welding zone. An anvil serves as a backing for the w/p and provides the necessary reaction to clamping force. A timer controls the weld interval in spot type, for continuous seam welding.

 

A frequency converter converts 50 cycle line power into high-frequency electrical power and transducers change the high-frequency electrical power into ultrasonic vibratory energy which is transmitted to the joint through the welding tip attached to the transducer. The tip oscillates in the plane of the joint interface. A large amount of heat is generated due to friction between plates which is sufficient to weld the plates.

 

 

Advantage of Ultrasonic Welding

1)    Surface preparation is not critical.

2)    No defects are produced from the arc, gases, and filler metals.

3)    Dissimilar metals having vastly different melting points can bejoined.

4)    Minimum surface deformation results.

5)    Very thin material can be welded.

6)    Thin and thick sections can be joined together.

7)    To weld, glass is impossible by any other means.

 

Ultrasonic welding Disadvantage

1)    Ultrasonic welding is not economically competitive when other processes can be used to do the same job.

2)    Material being welded tend to weld to the tip and anvil.

3)    Due to the fatigue load, the life of welding is short.

4)    Very ductile material will yield under ultrasonic strain without sliding.

 

Ultrasonic welding Application

1)    Joining electrical and electronic components.

2)    Welding aluminum wire and sheet.

3)    Hermetic seating of volatile substances.
4)    The ultrasonic process also tends applications involving bimetallic functions and in producing a variety of joint configurations.