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<p>Underwater laser metal deposition (ULMD) is a promising technology for in situ repair of underwater structures. A stable local dry cavity, which focuses only on the deposition area, is needed to minimize the risk of water and to ensure the metallurgical quality of the deposited materials. In this study, a drainage device was developed and validated to generate an efficiently local dry cavity for ULMD of metal materials. Based on CFD simulations, the influence of drainage device configuration and gas flow rate on the quality of local dry cavity was evaluated, using the two parameters of effective working diameter and circumferential uniformity. The results show that the optimized design of the drainage device can provide a local dry cavity with no water intrusion around the laser processing area. The optimized parameters are the number of inlets of 4, outlet angle of 90°, and gas flow rate of 120&#xa0;L/min. In addition, the Ti6Al4V sample was fabricated to verify the validity of the drainage device for ULMD process. The deposited Ti6Al4V sample exhibits continuous and uniform, and the surface presents largely shiny silvery indicating a slight oxidation. The optimal drainage device offers the possibility of ULMD process in an underwater environment.</p>

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Development of a Drainage Device for Local Dry Underwater Laser Metal Deposition of Ti6Al4V Reactive Alloy

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Dongji Cheng,
  • Jinchao Zhang,
  • Jiaqi Li,
  • Qingqing Zhu

摘要

Underwater laser metal deposition (ULMD) is a promising technology for in situ repair of underwater structures. A stable local dry cavity, which focuses only on the deposition area, is needed to minimize the risk of water and to ensure the metallurgical quality of the deposited materials. In this study, a drainage device was developed and validated to generate an efficiently local dry cavity for ULMD of metal materials. Based on CFD simulations, the influence of drainage device configuration and gas flow rate on the quality of local dry cavity was evaluated, using the two parameters of effective working diameter and circumferential uniformity. The results show that the optimized design of the drainage device can provide a local dry cavity with no water intrusion around the laser processing area. The optimized parameters are the number of inlets of 4, outlet angle of 90°, and gas flow rate of 120 L/min. In addition, the Ti6Al4V sample was fabricated to verify the validity of the drainage device for ULMD process. The deposited Ti6Al4V sample exhibits continuous and uniform, and the surface presents largely shiny silvery indicating a slight oxidation. The optimal drainage device offers the possibility of ULMD process in an underwater environment.