超声波焊接技术.pptx

UltrasonicweldingMadeby:MohamedhamdymandohMohamednasraboelhamayelNadersalamaebrahimPresentedto:Dr.Hassanabdelhafez

CONTENTSINTRODUCTIONWHYTOUSEUSWELDINGULTRASONICWELDINGPROCESSULTRASONICWELDINGMECHANISMPRINCIPLEOFULTRASONICMACHININGJOINTFORMSWITHULTRASONICMACHININGSPOTWELDINGINAIRCRAFTWINGSADVANTAGESDISADVANTAGESAPPLICATION

INTRODUCTIONUltrasonicwelding?isan?industrial?techniquewherebyhigh-frequency?ultrasonic?acoustic?vibrations?arelocallyappliedtoworkpiecesbeingheldtogetherunderpressuretocreateasolid-state?weld.

Flowchartofsolidstatewelding

MAINPARTSTRANSDUCERProduceshighfrequencyultrasonicvibrations.CONVERTORConvertstheelectricalsignalintoamechanicalvibration

BOOSTERModifiestheamplitudeofvibrationsSONOTRODEAppliesthemechanicalvibrationstothepartstobeweldedAnvilMAINPARTS

UltrasonicWeldingMechanismAstaticclampingforceisappliedperpendiculartotheinterfacebetweentheworkpieces.Thecontactingsonotrodeoscillatesontheinterface.Combinedeffectofstaticandoscillatingforceproducesdeformationwhichpromoteswelding.AnvilSonotrodetipClampingforcewedgeTransducerForceworkpiece10-75KHz

PrincipleofUltrasonicWeldingAnvilMassSonotrodetipClampingforcewedgeTransducerForceWeldmentVibration*InUSwelding,frictionalheatproducedbytheultrasonicwavesandforceisusedforjoiningprocess.*USwaves(15to60kHz)aretransferredtothematerialunderpressurewithasonometer.Weldingtimesarelowerthan3s.*Itcanproceedwithorwithouttheapplicationofexternalheat.

UltrasonicWeldingPowerGenerationFrequencyistransformedtovibrationenergythroughthetransducer.Energyrequirementestablishedthroughthefollowingempiricalrelationship. E=K(HT)3/2 E=electricalenergy,W*s(J) H=Vickershardnessnumber T=thicknessofthesheetElectricalenergyFrequencyConverterVibratorytransducer

InterfacialInteractionLocalizedPl