Laser beam welding of any metal.

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The effect of a metal's thermophysical properties on its weldability are examined. The thermal conductivity, melting point, absorptivity and thermal diffusivity of the metal and the laser beam focused diameter and welding speed influence the minimum beam irradiance required for melting and welding. Beam diameter, surface tension and viscosity of the molten metal affect weld pool stability and weld quality. Lower surface tension and viscosity increases weld pool instability. With larger beam diameters causing wider welds, dropout also increases. Effects of focused beam diameter and joint fitup on weldability are also examined. Small beam diameters are sensitive to beam coupling ... continued below

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11 p.

Creation Information

Leong, K. H. October 1, 1998.

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Description

The effect of a metal's thermophysical properties on its weldability are examined. The thermal conductivity, melting point, absorptivity and thermal diffusivity of the metal and the laser beam focused diameter and welding speed influence the minimum beam irradiance required for melting and welding. Beam diameter, surface tension and viscosity of the molten metal affect weld pool stability and weld quality. Lower surface tension and viscosity increases weld pool instability. With larger beam diameters causing wider welds, dropout also increases. Effects of focused beam diameter and joint fitup on weldability are also examined. Small beam diameters are sensitive to beam coupling problems in relation to fitup precision in addition to beam alignment to the seam. Welding parameters for mitigating weld pool instability and increasing weld quality are derived from the above considerations. Guidelines are presented for the tailoring of welding parameters to achieve good welds. Weldability problems can also be anticipated from the properties of a metal.

Physical Description

11 p.

Notes

OSTI as DE00010807

Medium: P; Size: 11 pages

Source

  • 17th International Congress on Applications of Lasers and Electro-Optics (ICALEO '98), Orlando, FL (US), 11/16/1998--11/19/1998

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  • Report No.: ANL/TD/CP-96467
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10807
  • Archival Resource Key: ark:/67531/metadc620883

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  • October 1, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 7:41 p.m.

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Leong, K. H. Laser beam welding of any metal., article, October 1, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc620883/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.