GUIDED BY : SUBMITTED BY:

ASST PROF:S SAHU SUBHASIS KUMAR PANDA

REDG NO:1101308245

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INTRODUCTIONWHY TO USE US WELDINGULTRASONIC WELDING PROCESSULTRASONIC WELDING MECHANISMPRINCIPLE OF ULTRASONIC MACHININGJOINT FORMS WITH ULTRASONIC MACHININGSPOT WELDING IN AIRCRAFT WINGSADVANTAGESDIS ADVANTAGESAPPLICATION

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INTRODUCTION Ultrasonic Sonic means The wave haveing frequency is

more then 20khz. Ultrasonic welding is an industrial technique whereby high-frequency ultrasonic acoustic vibrations are locally applied to work pieces being held together under pressure to create a solid-state weld.

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Why to use US welding?

First - Ultrasonic assembly uses ultrasonic vibratory energy which is transmitted through the parts to melt and bond thermoplastic materials And joining thin sheet gauge metals and other lightweight materialsSecond - This technique is fast, efficient, non-contaminating and requires no consumables. Third - In ultrasonic welding, there are no connective bolts, nails, soldering materials, or adhesives necessary to bind the materials together.

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Ultrasonic Welding Process

Process Description:

Components of ultrasonic welding system include:

Transducer

Sonotrode

Anvil

Anvil

Mass

Sonotrodetip

Clampingforce

wedge Transducer

Force

WeldmentVibration

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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. Anvil

Mass

Sonotrodetip

Clampingforce

wedge Transducer

Force

workpiece

Ultrasonic Welding Mechanism

10-75 KHz

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Principle of Ultrasonic Welding

In ultrasonic welding, frictional heat produced by the ultrasonic waves and force is used for the joining process. Ultrasonic waves (15 to 60 kHz) are transferred to the material under pressure with a sonometer. Welding times are lower than 3 s. The welding can proceed with or without the application of external heat.

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Spot welding in aircraft wings

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Advantages Heat affected zone is minimized

Very thin materials can be welded

Surface deformation is minimum

Welding of glass is also possible

No defects due to gases, arc and filler metal

Presure uses are lower ,and welding time are shoter

Dissimilar materials can be joined

Welding can be made through some surface coating

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Disadvantages

Restricted to join thin materials

Competitively not economical

Materials being welded may tend to weld to the tip and anvil

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Applications Manufacturing of toys

Joining of electrical and electronic components

Welding aluminium wire and sheet

Mobiles, sports shoes , laminations, cars…….

Packing , medical industries, computers.

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ULTRASONIC WELDING I VIDEO MODE

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