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Chinese Journal of Lasers, Volume. 52, Issue 12, 1202104(2025)

OCT Algorithmic Optimization for Penetration Depth Monitoring in Laser Deep Penetration Welding of High‐Reflectivity Alloys

Yuanhao Ren1,2, Di Wu1,2、*, Zekai Hou3, Lu Zhang3, Yuan Liu3, Jinfang Dong1,2, and Peilei Zhang1,2
Author Affiliations
  • 1School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
  • 2Shanghai Collaborative Innovation Center of Advanced Laser Manufacturing Technology, Shanghai 201620, China
  • 3TRUMPF (China) Co., Ltd., Taicang215400, Jiangsu , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (10)
    Equations (0)
    References (13)
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    Figures & Tables(10)
    Schematic diagram of real-time monitoring system for laser welding penetration depth based on OCT technology

    Fig. 1. Schematic diagram of real-time monitoring system for laser welding penetration depth based on OCT technology

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    Metallographic images of weld cross sections. (a) Aluminum plate; (b) copper plate

    Fig. 2. Metallographic images of weld cross sections. (a) Aluminum plate; (b) copper plate

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    Metallographic images of weld longitudinal sections. (a) Aluminum plate; (b) copper plate

    Fig. 3. Metallographic images of weld longitudinal sections. (a) Aluminum plate; (b) copper plate

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    Schematics of weld appearance. (a) Aluminum plate; (b) copper plate

    Fig. 4. Schematics of weld appearance. (a) Aluminum plate; (b) copper plate

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    Total area occupied by data points versus brightness threshold

    Fig. 5. Total area occupied by data points versus brightness threshold

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    Definition of density by LOF algorithm

    Fig. 6. Definition of density by LOF algorithm

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    Comparison of keyhole depth obtained from OCT measurement and welding penetration depth obtained from metallographic measurement

    Fig. 7. Comparison of keyhole depth obtained from OCT measurement and welding penetration depth obtained from metallographic measurement

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    Comparison of weld longitudinal section data. (a) Aluminum plate; (b) copper plate

    Fig. 8. Comparison of weld longitudinal section data. (a) Aluminum plate; (b) copper plate

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    • Table 1. Welding process parameters for aluminum alloys

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      Table 1. Welding process parameters for aluminum alloys

      Experimental

      sequence

      Inner ring

      power Pi /W

      Outer ring

      power Po /W

      Welding speed

      v /（mm·s-1）

      Defocus

      amount h /mm

      		Welding path

      Amplitude

      A /mm

      Pitch

      p /mm

      Frequency

      f /Hz

      No.11000‒180020002000Straight line‒‒‒
      No.21500600‒26002000Straight line‒‒‒
      No.315002000200‒4000Straight line‒‒‒
      No.43150135080-2Helical line1.3‒2.10.65125
      No.53150135055‒133-2Helical line1.70.6585‒205

    • Table 2. Welding process parameters for copper alloys

      View table

      Table 2. Welding process parameters for copper alloys

      Experimental

      sequence

      Inner ring

      power Pi /W

      Outer ring

      power Po /W

      Welding speed

      v /（mm·s-1）

      Defocus

      amount h /mm

      		Welding path

      Amplitude

      A /mm

      Pitch

      p /mm

      Frequency

      f /Hz

      No.62750275060+2Helical line0.8‒1.20.6100
      No.72750275048‒70+2Helical line1.70.680‒120
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    Yuanhao Ren, Di Wu, Zekai Hou, Lu Zhang, Yuan Liu, Jinfang Dong, Peilei Zhang. OCT Algorithmic Optimization for Penetration Depth Monitoring in Laser Deep Penetration Welding of High‐Reflectivity Alloys[J]. Chinese Journal of Lasers, 2025, 52(12): 1202104

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    Paper Information

    Category: Laser Forming Manufacturing

    Received: Jan. 2, 2025

    Accepted: Feb. 20, 2025

    Published Online: May. 24, 2025

    The Author Email: Di Wu (wudi@sues.edu.cn)

    DOI:10.3788/CJL250432

    CSTR:32183.14.CJL250432

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology