Predicting threshold laser beam irradiances for melting and welding

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A model based on conservation of energy for a moving heat source incident on a flat plate is used to predict the threshold laser beam irradiance required to initiate melting on a metal surface. With the use of a nondimensional variable and its solution, the threshold irradiance can be predicted with the use of a simple equation that is a function of the absorptivity of the surface, thermal conductivity of the metal, temperature increase for melting, diameter of the laser beam at the surface and the nondimensional variable value for the ratio of the thermal diffusivity of the metal to ... continued below

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10 p.

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Leong, K.H.; Geyer, H.K.; Sabo, K.R. & Sanders, P.G. September 1, 1997.

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Description

A model based on conservation of energy for a moving heat source incident on a flat plate is used to predict the threshold laser beam irradiance required to initiate melting on a metal surface. With the use of a nondimensional variable and its solution, the threshold irradiance can be predicted with the use of a simple equation that is a function of the absorptivity of the surface, thermal conductivity of the metal, temperature increase for melting, diameter of the laser beam at the surface and the nondimensional variable value for the ratio of the thermal diffusivity of the metal to the product of the beam diameter and velocity used. Laser beam irradiances exceeding these predicted values are required for welding. The model predictions are validated with experimental results of beam irradiances required for welding different metals.

Physical Description

10 p.

Notes

OSTI as DE98000648

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  • 16. international congress on applications of laser and electro-optics, San Diego, CA (United States), 17-20 Nov 1997

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  • Other: DE98000648
  • Report No.: ANL/TD/CP--93140
  • Report No.: CONF-971149--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 634049
  • Archival Resource Key: ark:/67531/metadc697981

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Sept. 1, 2016, 1:32 p.m.

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Leong, K.H.; Geyer, H.K.; Sabo, K.R. & Sanders, P.G. Predicting threshold laser beam irradiances for melting and welding, article, September 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc697981/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.