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Analysis of Metallic Plume Image Characteristics During High Power Disk Laser Welding

  • Xiangdong Gao
  • Runlin Wang
  • Yingying Liu
  • Yongchen Yang
Chapter
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 247)

Abstract

Metallic plume is an important phenomenon during high power disk laser deep-penetration welding, which can reflect the welding quality. To study this laser-induced plume characteristics and its relation to welding quality, an extraviolet and visible sensitive high speed color camera was used to capture the metallic plumes in a high-power disk laser bead on plate deep-penetration welding of Type 304 austenitic stainless steel plates at a continuous laser power of 10 kW. These captured digital images were firstly processed in RGB color spaces, and then were transferred to the Hue-Saturation-Intensity (HSI) color spaces from the RGB color spaces. The area of metallic plume was segmented and defined as the plume eigenvalue. The fluctuation of weld bead width was used to evaluate the welding stability. To monitor the plume behavior, a short-time Fourier transform was applied to obtain the time–frequency characteristics of plume images. Also, the hierarchical clustering was analyzed for the time–frequency characteristics of plume images. The results of hierarchical clustering showed there existed relationship between the metallic plume area and welding quality, and the fitting curve of clustering could reflect the fluctuation trend of the weld bead width effectively.

Keywords

Disk laser welding Hierarchical clustering Image characteristics Metallic plume image Short-time Fourier transform Time–frequency analysis 

Notes

Acknowledgments

This work is an expanded version of the paper published at WCECS 2012 in San Francisco, USA, October 24–26, 2012, and was supported in part by the National Natural Science Foundation of China under Grant 51175095, in part by the Guangdong Provincial Natural Science Foundation of China under Grants 10251009001000001 and 9151009001000020, and in part by the Specialized Research Fund for the Doctoral Program of Higher Education under Grant 20104420110001. Many thanks are given to Katayama Laboratory, Osaka University, Japan, for their assistance of laser welding experiments.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Xiangdong Gao
    • 1
  • Runlin Wang
    • 1
  • Yingying Liu
    • 1
  • Yongchen Yang
    • 1
  1. 1.School of Electromechanical EngineeringGuangdong University of TechnologyGuangzhouChina

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