Abhi ultrasonic
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Transcript of Abhi ultrasonic
ULTRASONIC WELDING
SolidState
Welding
Electrical
Chemical
Mechanical
Friction
Pressure UltrosonicWeld
Flow chart of solid state welding
Definition of Ultrasonic Welding“Ultrasonic welding is solid state
welding process , where in coalescence is produce by local application of high frequency vibratory energy to the workpiece as they held together under pressure ”
Ultrasonic Welding Mechanism
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
Sonotrode tip
Clamping force
wedge Transducer
Force
workpiece
10-75 KHz
Principle of Ultrasonic Welding
Anvil
Mass
Sonotrode tip
Clampingforce
wedge Transducer
Force
WeldmentVibration
*In US welding, frictional heat produced by the ultrasonic waves and force is used for joining process.*US waves(15to60 kHz) are transferred to the material under pressure with a sonometer. Welding times are lower than 3 s. -*It can proceed with or without the application of external heat.
Types of US welding
• Spot Welding
• Ring Welding
• Line Welding •- Linear Sonotrode
• Continuous Seam Welding - Roller Sonotrode
.Types of Ultrasonic
Welding
ultrasonicspot-type welding machine
Lateral DriveUltrasonicWelder
Ultrasonic Welding Interfacial Interaction
Localized temperature rises resulting from interfacial slip and plastic deformation.
Temperature is also influenced by power, clamping force, and thermal properties of the material.
Localized Plastic DeformationMetallurgical phenomena such as
recrystallizing, phase transformation, etc..... can occur.
Extreme InterpenetrationNickel Foil (top) to Gold-Plated Foil
Local Plastic FlowDark Regions are Trapped OxideNickel Foil (top) to Molybdenum Sheet
Very Little Penetration, Thin Bond Line, Fiber FlowMolybdenum Sheet to Itself
Advantages of Ultrasonic WeldingNo heat is applied and no melting occurs.Heat affected zone is minimized. Minimum surface deformation.Very thin materials can be weld.No defect due to arc , gases ,filler metal.Welding of glass is also possible.Pressures used are lower, welding times are
shorterDissimilar metal can be weld.
Limitations of Ultrasonic WeldingRestricted to join thin welding.Process is limited to lap joints.Competitively not economics.Material being may weld to the anvil
and tip only.
Applications of Ultrasonic Welding Computer and electrical industriesdelicate
circuits, Junctions of wire harnesses , flash drives and computer disks, Semiconductor devices
Aerospace and automotive industriesinstrument panels, door panels, lamps, air ducts, steering wheels, and engine components
Medical industry hospital gowns , sterile garments, masks, transdermal patches, dialysis tubes, pipettes
Packaging industryEncapsulation and Sealing containers, tubes packaging, hermetic sealing.
Starter motor armature with wires joined in commutator slots by
ultrasonic weldingUltrasonically welded
Helicopter access door.
Wire Harnessing