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Effect of welding heat input on pores in laser-arc hybrid welding of high nitrogen steel

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Abstract

This study explores the laser-arc hybrid welding process of high nitrogen steel (HNS) in order to circumvent the problem of welding porosity. The influence of welding heat input on welding porosity has been elucidated by analyzing the changes in the morphological characteristics of the laser keyhole and the molten pool temperature. The results show that the pore ratio increases with a rise in laser power. Meanwhile, the pore ratio first decreases and then increases as the welding current intensifies. Additionally, it decreases as the welding speed and defocus amount increase. The lowest pore ratio of the weld is considered as the desired value, and the response surface method (RSM) is used to optimize the heat input parameters. When the laser power ranges from 2.80 to 2.85 kW, the welding current becomes 260 A, welding speed ranges from 0.73 to 0.80 m/min, defocus amount ranges from 0 to 1 mm, and pore ratio of the weld exhibits its minimum value (4.29 to 4.67%).

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All data generated or analyzed during this study are included in this published article.

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Funding

This research was supported by a grant from the Horizontal Subject (20210046).

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Authors and Affiliations

  1. College of Mechanical and Civil Engineering, Jilin Agricultural Science and Technology University, Jilin, 132101, People’s Republic of China

    Bo Cui, Tianwen Luo & Mingjia Feng

  2. College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun, 130022, People’s Republic of China

    Shuangyu Liu & Fulong Zhang

  3. School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng, 224051, People’s Republic of China

    Shuangyu Liu

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  1. Bo Cui
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  2. Shuangyu Liu
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  3. Fulong Zhang
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  4. Tianwen Luo
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  5. Mingjia Feng
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Contributions

Shuangyu Liu contributed to the conception of the study. Fulong Zhang performed the experiment. Tianwen Luo and Mingjia Feng contributed to analysis and manuscript preparation.

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Correspondence to Bo Cui.

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Cui, B., Liu, S., Zhang, F. et al. Effect of welding heat input on pores in laser-arc hybrid welding of high nitrogen steel. Int J Adv Manuf Technol 119, 421–434 (2022). https://doi.org/10.1007/s00170-021-08113-z

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  • DOI: https://doi.org/10.1007/s00170-021-08113-z

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