Infrared and Laser Engineering, Volume. 52, Issue 7, 20220130(2023)

Effect of laser spot size on the behavior of molten pool and keyhole in laser welding

Jin Peng1,2,3, Hongqiao Xu1, Yongbiao Wang4, Xingxing Wang1, Yongzhen Zhang2, Weimin Long3, and Dingyu Zhang1
Author Affiliations
  • 1Henan International Joint Laboratory of High-efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
  • 2National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China
  • 3China Academy of Machinery Ningbo Academyof Intelligent Machine Tool Co., Ltd., Ningbo 315700, China
  • 4Henan Key Laboratory of Mechanical Equipment Intelligent Manufacturing, Zhengzhou Light Industry University, Zhengzhou 450002, China
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    Figures & Tables(12)
    Calculation domain of laser welding
    Three dimensional transient behavior with laser spot radius of 0.1 mm. (a)t ms; (b) t+3.5 ms; (c) t+3.8 ms; (d) t+3.9 ms; (e) t+4.1 ms
    Three dimensional transient behavior with laser spot radius of 0.15 mm. (a) tms; (b) t+3.5 ms; (c) t+3.8 ms; (d) t+3.9 ms; (e)t+4.1 ms
    Three dimensional transient behavior with laser spot radius of 0.2 mm. (a)t ms; (b) t+3.5 ms; (c) t+3.8 ms; (d) t+3.9 ms; (e) t+4.1 ms
    Flow field of molten pool with laser spot radius of 0.1 mm. (a) t ms; (b) t+3.5 ms; (c) t+3.8 ms; (d) t+3.9 ms; (e) t+4.1 ms
    Flow field of molten pool with laser spot radius of 0.15 mm. (a) t ms; (b) t+3.5 ms; (c) t+3.8 ms; (d) t+3.9 ms; (e) t+4.1 ms
    Flow field of molten pool with laser spot radius of 0.2 mm. (a)t ms; (b) t+3.5 ms; (c)t+3.8 ms; (d) t+3.9 ms; (e) t+4.1 ms
    Maximum flow velocity of molten pool under different spot radius
    Surface length of molten pool under different spot radius
    Schematic diagram of gasification and vapour flow behavior on the wall of the keyhole
    Experimental weld pool image and numerical simulation weld pool image
    • Table 1. Thermal physical properties of 6056 aluminum alloy

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      Table 1. Thermal physical properties of 6056 aluminum alloy

      Physical quantitySymbolNumerical value
      Solid density$ {\rho _s} $2720
      Liquid density$ {\rho _l} $2590
      Solidus temperature$ {T_s} $860
      liquidus line emperature$ {T_L} $917
      Gas line temperature$ {T_v} $2740
      Latent heat of fusion$ {L_m} $$ 3.87 \times {10^{ 5}} $
      Latent heat of vaporization$ {L_v} $$ 1.08\times{10^{ - 7}} $
      Thermal expansion coefficient$ {\beta _k} $$ 1.92 \times {10^{ - 5}} $
      Heat transfer coefficient$ {h_c} $15
      Surface tension at 930 K$ \delta $0.914
      Surface tension gradient coefficient${\rm{d}}\delta /{\rm{d}}T$$ - 3.5 \times {10^{ - 4}} $
      Emissivity$ \varepsilon $0.08
      Ambient temperature$ {T_{ref}} $300
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    Jin Peng, Hongqiao Xu, Yongbiao Wang, Xingxing Wang, Yongzhen Zhang, Weimin Long, Dingyu Zhang. Effect of laser spot size on the behavior of molten pool and keyhole in laser welding[J]. Infrared and Laser Engineering, 2023, 52(7): 20220130

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    Paper Information

    Category: Lasers & Laser optics

    Received: Feb. 27, 2022

    Accepted: --

    Published Online: Aug. 16, 2023

    The Author Email:

    DOI:10.3788/IRLA20220130

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