FUNDAMENTALS OF ULTRASONIC WELDING

Abstract

Photoelastic investigations show that ultrasonic welds are initiated as a result of vibration-induced interfacial shear stresses combining with the interfacial shear stresses resulting from the normal clamping force to produce ALTERNATELY, ON THE SIDE TOWARD WHICH THE VIBRATORY FORCE ACTS, ISLANDS OF LOCAL SLP WITHIN AN AREA OF ELASTIC STRAIN. A proper clamping force is productive of a best impedance match to effect energy delivery into the weld locale. Sheet thickness and the Vickers microhardness indentation number are combined to permit a first approximation of the energy required to produce welds between metallic sheets. Bonds are not uncommonly characterized by internal deformations without significant external deformation. The temperature achieved during vibratory welding is measured to be in the range of about 35 to 50% of the absolute melting temperature. No evidence of melting was observed in any monometallic weld.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1960
Accession Number
AD0257514

Entities

People

  • Dennison Bancroft
  • J. B. Jones
  • John G. Thomas
  • Nicholas Maropis

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Chemistry
  • Crystal Structure
  • Elastic Properties
  • Electron Microscopy
  • Heat Energy
  • Materials
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Oxide Films
  • Plastic Properties
  • Sheet Metal
  • Standing Waves
  • Surface Properties
  • Titanium
  • Welds

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy
  • Thin Film Deposition Science.