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Analysis and design of coaxial nozzle with rectangular outlet for high power diode laser in laser metal deposition

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Abstract

High power diode laser (HPDL) characterized by a wider rectangle beam spot (RBS) with top-hat intensity distribution is particularly applied in laser metal deposition to manufacture large-scale components. In order to design a coaxial nozzle with rectangular outlet to match the RBS of the HPDL, a novel wide-beam coaxial feeding nozzle (WBCFN) outlet is proposed. Based on the gas-powder flow model established in ANSYS FLUENT, the influence of structural parameters of the new coaxial nozzle on the gas flow and powder distribution is investigated. Two quantitative indexes are defined to seek out the optimal designing scheme that minimize the divergences of the powder flow and uniform the powder distribution in transverse and longitudinal directions. And then, the effect and sensitivity of structural parameters on concentration distribution and focal length of powder flow are analyzed. The results indicate that the two indexes increase with the increase of exit width, while the variance of concentration firstly increases and then decreases with the increase of the chamber length and inclination angle. The focal length decreases with the increase of inclination angle. Finally, the optimal solution of designing scheme is obtained through comprehensive analysis, and experiments are carried out to validate the model, which indicates that the designed WBCFN can acquire good morphology and quality of deposition layer for HPDL.

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Funding

This work was supported by the National Key R&D Program of China (Grant No. 2018YFB1106500) and the National Natural Science Foundation of China (Grant No.51575415). The authors gratefully thank all staffs of Hubei Key Laboratory of Advanced Technology for Automotive Components for supporting this work.

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, Hubei, China

    Mao Ni, Xunpeng Qin & Zeqi Hu

  2. School of Automotive Engineering, Wuhan University of Technology, Wuhan, 430070, Hubei, China

    Mao Ni, Xunpeng Qin & Zeqi Hu

  3. School of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan, 430065, Hubei, China

    Huaming Liu

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  1. Mao Ni
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  2. Xunpeng Qin
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Correspondence to Xunpeng Qin.

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Ni, M., Qin, X., Liu, H. et al. Analysis and design of coaxial nozzle with rectangular outlet for high power diode laser in laser metal deposition. Int J Adv Manuf Technol 106, 4789–4803 (2020). https://doi.org/10.1007/s00170-019-04874-w

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