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Effect of external constraint on the characteristics and behavior of the plasma plume during high-power CO2 laser welding

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Abstract

Laser-induced plasma has been one of the hotspots of high-power CO2 laser welding for many years. A novel method was proposed to suppress the plasma plume through external constraints, which resulted in more stable welding process and slightly increased penetration depth. Based on high-speed camera and image processing technology, it was demonstrated that the expansion of plasma plume both in height and width was suppressed by a pair of water-cooled copper blocks laid near laser incident point along the direction of seam. Besides its intensity and size, the dynamical behavior of plasma plume under spatial constraint was observed and analyzed by the characteristic parameters. The constraint mechanism and influence of the spacing between the two copper blocks was discussed. Results showed that external constraint was effective to suppress plasma plume, stabilize welding process, and to increase weld penetration for high-power CO2 laser welding.

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Authors and Affiliations

  1. Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, China, 200240

    Dawei Sun, Yan Cai, Yue Wu, Junjie Zhu & Yixiong Wu

  2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai, China, 200240

    Dawei Sun, Yan Cai, Yue Wu, Junjie Zhu & Yixiong Wu

Authors
  1. Dawei Sun
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  2. Yan Cai
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  3. Yue Wu
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  4. Junjie Zhu
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  5. Yixiong Wu
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Correspondence to Yan Cai.

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Sun, D., Cai, Y., Wu, Y. et al. Effect of external constraint on the characteristics and behavior of the plasma plume during high-power CO2 laser welding. Int J Adv Manuf Technol 73, 1253–1263 (2014). https://doi.org/10.1007/s00170-014-5923-3

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  • DOI: https://doi.org/10.1007/s00170-014-5923-3

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