Alloying element vaporization and liquid metal expulsion during laser microjoining of stainless steel with short pulse

X. He, J. T. Norris, P. W. Fuerschbach, T. DebRoy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Vaporization and liquid metal expulsion are the two main mechanisms of material loss during laser microjoining. Various factors that affect alloying element vaporization and liquid metal expulsion during microjoining of 304 stainless steel with short Nd-yttrium aluminum garnet (YAG) laser pulses were investigated experimentally and theoretically. The temperature fields used to simulate the loss of materials were obtained from a well-tested comprehensive three-dimensional transient heat transfer and fluid flow model. The calculated fusion zone geometry and composition change produced by laser microjoining under various welding conditions showed fair agreement with the corresponding experimental results. The conditions necessary for the initiation of liquid metal expulsion were determined by balancing the vapor recoil force with the surface tension force at the periphery of the liquid pool. The laser power density and pulse duration are important parameters for liquid metal expulsion. Higher power density and longer pulse duration increases the tendency of liquid metal expulsion during laser microjoining.

Original languageEnglish (US)
Title of host publicationTrends in Welding Research - Proceedings of the 7th International Conference
Pages109-114
Number of pages6
StatePublished - Dec 1 2005
Event7th International Conference on Trends in Welding Research - Pine Mountain, GA, United States
Duration: May 16 2005May 20 2005

Publication series

NameASM Proceedings of the International Conference: Trends in Welding Research
Volume2005

Other

Other7th International Conference on Trends in Welding Research
CountryUnited States
CityPine Mountain, GA
Period5/16/055/20/05

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering

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    He, X., Norris, J. T., Fuerschbach, P. W., & DebRoy, T. (2005). Alloying element vaporization and liquid metal expulsion during laser microjoining of stainless steel with short pulse. In Trends in Welding Research - Proceedings of the 7th International Conference (pp. 109-114). (ASM Proceedings of the International Conference: Trends in Welding Research; Vol. 2005).