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Volume 30 Issue 1
Sep.  2013
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The relationship between plasma optic signal and penetration depth during partial-penetration laser welding

  • 1.

    Department of Materials Science and Technology, HUST, Wuhan 430074, China

  • Corresponding author: HU Lun-ji, lunjihu@163.com ; 
  • Received Date: 2004-10-19
    Accepted Date: 2004-11-04
  • At some process condition,the weld fusion area increase linearly with heat input,and for the two common parameters of laser power and weld speed,laser power has more influence on penetration while weld speed has more influence on weld width.The plasma optic signal at 400nm~600nm corresponds to variation of the weld penetration,and the signal's RMS value increases with the penetration in a quadratic curve mode.The inherent relation between plasma optic signal and penetration is also analyzed.The results provide theoretical and practical guidance for real-time penetration monitor and prediction in partial-penetration laser welding.
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    WANG J Ch.Development and expectation of laser welding technology[J].Laser Technology,2001,25(1):48～53(in Chinese).
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    LUO H.The principles and technologies of defect diagnosis an laser welding of thin sheets[D].Wuhan:HUST,1998.29～31(in Chinese).
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    SUN A,Jr KANNATEY-ASIBU E,GARTNER M.Monitoring of laser weld penetration using sensor fusion[J].Journal of Laser Applications,2002,14(2):114～121.
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    FARSON D F,ALI A.Laser weld penetration monitoring with multiple signal measurement[J].Journal of Laser Applications,1999,11(2):47～52.
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    ANCONA A,SPAGNOLO V,LUGARA P M et al.Optical sensor for real-time monitoring of CO2laser welding process[J].Appl Opt,2001,40(33):6019～6025.
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    TANG X H,ZHU H H,ZHU G F.Detection of laser-induced plasma for high-power laser beam welding[J].Laser Technology,1996,20(5):312～316(in Chinese).
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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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The relationship between plasma optic signal and penetration depth during partial-penetration laser welding

    Corresponding author: HU Lun-ji, lunjihu@163.com; 
  • 1. Department of Materials Science and Technology, HUST, Wuhan 430074, China
  • Received Date: 2004-10-19
  • Accepted Date: 2004-11-04
  • Available Online: 2006-01-25

Abstract: At some process condition,the weld fusion area increase linearly with heat input,and for the two common parameters of laser power and weld speed,laser power has more influence on penetration while weld speed has more influence on weld width.The plasma optic signal at 400nm~600nm corresponds to variation of the weld penetration,and the signal's RMS value increases with the penetration in a quadratic curve mode.The inherent relation between plasma optic signal and penetration is also analyzed.The results provide theoretical and practical guidance for real-time penetration monitor and prediction in partial-penetration laser welding.

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