Analysis of ripple formation in single crystal spot welds

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Description

Stationary spot welds have been made at the (001) surface of Fe-l5%Ni-15%Cr single crystals using a Gas Tungsten Arc (GTA). On the top surface of the spot welds, very regular and concentric ripples were observed after solidification by differential interference color microscopy. Their height (typically 1--5 {micro}m) and spacing (typically {approximately} 60 {micro}m) decreased with the radius of the pool. These ripples were successfully accounted for in terms of capillary-wave theory using the fundamental mode frequency f{sub 0} given by the first zero of the zero-order Bessel function. The spacing d between the ripples was then equated to v{sub s}/f{sub ... continued below

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10 p.

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Rappaz, M.; Corrigan, D. & Boatner, L. A. October 1, 1997.

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  • Rappaz, M. Ecole Polytechnique Federale de Lausanne (Switzerland). Lab de Metallurgie Physique
  • Corrigan, D.
  • Boatner, L. A. Oak Ridge National Lab., TN (United States). Solid State Div.

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Description

Stationary spot welds have been made at the (001) surface of Fe-l5%Ni-15%Cr single crystals using a Gas Tungsten Arc (GTA). On the top surface of the spot welds, very regular and concentric ripples were observed after solidification by differential interference color microscopy. Their height (typically 1--5 {micro}m) and spacing (typically {approximately} 60 {micro}m) decreased with the radius of the pool. These ripples were successfully accounted for in terms of capillary-wave theory using the fundamental mode frequency f{sub 0} given by the first zero of the zero-order Bessel function. The spacing d between the ripples was then equated to v{sub s}/f{sub 0}, where v{sub s} is the solidification rate. From the measured ripple spacing, the velocity of the pool was deduced as a function of the radius, and this velocity was in good agreement with the results of a heat-flow simulation.

Physical Description

10 p.

Notes

OSTI as DE98000897

Source

  • 8. international conference on modeling of casting, welding and advanced solidification processes, San Diego, CA (United States), 7-12 Jun 1998

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  • Other: DE98000897
  • Report No.: ORNL/CP--94924
  • Report No.: CONF-980635--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/645514 | External Link
  • Office of Scientific & Technical Information Report Number: 645514
  • Archival Resource Key: ark:/67531/metadc695649

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Creation Date

  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 3, 2016, 7:01 p.m.

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Rappaz, M.; Corrigan, D. & Boatner, L. A. Analysis of ripple formation in single crystal spot welds, report, October 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc695649/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.