Visualization of Gas Tungsten Arc Weld Pools

Abstract

Surface flow visualization of Gas Tungsten Arc weld pools for HY-80 steel is presented using a pulsed laser light source and a conventional night vision image-intensifier tube equipped video camera. Visualization of the weld pool free surface is made possible by seeding a flow with alumina particles for both stationary and moving arc welds. These visualizations reveal several new features not incorporated in the existing models for stationary welds. A strong clockwise stirring is observed contrary to the axi symmetric computational models. Also, the pool surface shows a bulge near the center. Complex flow patterns are observed for moving arc welding. Interpretations of the observed flows based on the driving forces are provided.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1991
Accession Number
ADA245926

Entities

People

  • Daniel C. Espinosa

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Arc Welding
  • Cameras
  • Chemistry
  • Computational Fluid Dynamics
  • Computer Simulations
  • Control Systems
  • Convection
  • Flow Visualization
  • Fluid Flow
  • Gas Tungsten Arc Welding
  • Heat Transfer
  • Lasers
  • Mathematical Models
  • Measurement
  • Photography
  • Welding
  • Welds

Readers

  • Fluid Dynamics.
  • Metallurgy
  • Plasma Physics.

Technology Areas

  • Directed Energy