Control of Structure in Conventional Friction Stir Welds Through a Kinematic Theory of Metal Flow

Abstract

In friction stir welding (FSW), a rotating pin is translated along a weld seam so as to stir the sides of the seam together. Metal is prevented from flowing up the pin, which would result in plowing/cutting instead of welding, by a shoulder on the pin. In conventional FSW, the weld metal rests on an "anvil", which supports the heavy "plunge" load on the tool. In this study, both embedded tungsten wires along and copper plating on the faying surfaces were used to trace the flow of AA2219 weld metal around the C-FSW tool. The effect of tool rotational speed, travel speed, plunge load, and pin thread pitch on the resulting weld metal flow was evaluated. Plan longitudinal, and transverse section x-ray radiographs were examined to trace the metal flow paths. The results are interpreted in terms of a kinematic theory of metal flow in FSW.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2009
Accession Number
ADA536290

Entities

People

  • A. C. Nunes Jr.
  • H. A. Rubisoff
  • J. A. Schneider

Organizations

  • Mississippi State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Band Structures
  • Diameters
  • Elements
  • Energy Bands
  • Flow
  • Flow Fields
  • Friction
  • Friction Stir Welding
  • Materials
  • Metals
  • Microstructure
  • Shoulder
  • Temperature Gradients
  • Transverse
  • Tungsten
  • Weld Metal
  • X Rays

Readers

  • Metallurgy