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Laser & Optoelectronics Progress, Volume. 58, Issue 17, 1714008(2021)

Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding

Xutian Chai1, Yan Yin1、*, Zhipeng Wang1, Kaiji Dong1, Zhihui Li1, and Ruihua Zhang2,3
Author Affiliations
  • 1State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou , Gansu 730050, China
  • 2China Iron & Steel Research Institute Group, Beijing 100081, China
  • 3Hardware Knife Cut Industrial Technology Research Institute of Yangjiang, Yangjiang , Guangdong 529533, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (16)
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    References (16)
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    Figures & Tables(16)
    Schematic diagram of narrow gap laser filler wire welding

    Fig. 1. Schematic diagram of narrow gap laser filler wire welding

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    Narrow gap welding groove

    Fig. 2. Narrow gap welding groove

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    Sampling of macroscopic cross-section and micro-hardness of weld

    Fig. 3. Sampling of macroscopic cross-section and micro-hardness of weld

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    Structure distribution of each zone of welded joint

    Fig. 4. Structure distribution of each zone of welded joint

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    Microstructure of base metal

    Fig. 5. Microstructure of base metal

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    Microstructures of weld center. (a) Low magnification ; (b) high magnification

    Fig. 6. Microstructures of weld center. (a) Low magnification ; (b) high magnification

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    Microstructures of HAZs. (a) CGHAZ; (b) FGHAZ; (c) INZ

    Fig. 7. Microstructures of HAZs. (a) CGHAZ; (b) FGHAZ; (c) INZ

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    Overlapping microstructures in weld zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure

    Fig. 8. Overlapping microstructures in weld zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure

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    Overlapping microstructures in heat affected zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure

    Fig. 9. Overlapping microstructures in heat affected zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure

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    Microhardness of different areas of weld

    Fig. 10. Microhardness of different areas of weld

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    Tensile fracture of welded joint

    Fig. 11. Tensile fracture of welded joint

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    Stress-strain curves of tensile sample

    Fig. 12. Stress-strain curves of tensile sample

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    Tensile fracture morphologies. (a) Macro morphology; (b) micro morphology

    Fig. 13. Tensile fracture morphologies. (a) Macro morphology; (b) micro morphology

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    • Table 1. Chemical compositions of D36 steel with high strength (mass fraction)

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      Table 1. Chemical compositions of D36 steel with high strength (mass fraction)

      ElementCMnSiNiPSCuCr
      Mass fraction≤ 0.1800.900‒1.600≤ 0.500≤ 0.400≤ 0.035≤ 0.035≤ 0.350≤ 0.200

    • Table 2. Chemical compositions of ER50-6 filler wire (mass fraction)

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      Table 2. Chemical compositions of ER50-6 filler wire (mass fraction)

      ElementCMnSiPSCrCu
      Mass fraction≤ 0.1501.400‒1.8500.800‒1.150≤ 0.025≤ 0.035≤ 0.500≤ 0.200

    • Table 3. Results of tensile test

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      Table 3. Results of tensile test

      Sampling locationYield strength /MPaTensile strength /MPaElongation /%Fracture position
      BM31249634.6BM
      Upper37652517.2BM
      Middle37053315.0BM
      Bottom40255014.6BM
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    Xutian Chai, Yan Yin, Zhipeng Wang, Kaiji Dong, Zhihui Li, Ruihua Zhang. Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding[J]. Laser & Optoelectronics Progress, 2021, 58(17): 1714008

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Dec. 28, 2020

    Accepted: Jan. 20, 2021

    Published Online: Sep. 14, 2021

    The Author Email: Yan Yin (yinyan@lut.cn)

    DOI:10.3788/LOP202158.1714008

    Topics

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