Journal of Light Metal Welding
Online ISSN : 2186-618X
Print ISSN : 0368-5306
ISSN-L : 0368-5306
Volume 54 , Issue 6
Technical Paper
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Technical Paper
  • Isaku Chimura, Yousuke Kawahito, Hidekazu Murakawa, Seiji Katayama
    2016 Volume 54 Issue 6 Pages 222-229
    Published: June 15, 2016
    Released: July 21, 2016
    JOURNALS FREE ACCESS

    Keyhole formation is one of the most important issues in laser welding. Keyhole formation in meltrun welding of pure titanium at laser powers from 4 to 6 kW and welding speeds 100 mm/s was investigated by X-ray in-situ observation and numerical calculation using particle method considering Fresnel absorption and vapor recoil pressure. E−ects of concentrated energy absorption due to local laser beam reflection and thermal transportation due to melt flow on keyhole formation were studied by the numerical calculation using particle method. It shows that expansion of the keyhole tip was caused by multi-reflection of the incident laser beam. Moreover, the calculated vaporization rate indicates the energy consumption in forming or maintaining a keyhole.

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