Role of welding speed on keyhole-induced porosity formation based on experimental and numerical study in fiber laser welding of Al alloy

  • Lijin Huang
  • Xueming HuaEmail author
  • Dongsheng Wu
  • Youxiong Ye


The keyhole behaviors were observed directly by laser welding experiment with quartz glass. Based on Fresnel absorption of laser beam and multi-reflection combined with volume of fluid (VOF) method, a three-dimensional mathematical model was established to study the role of welding speed on keyhole behaviors and keyhole-induced porosity formation in laser welding of aluminum alloy. The keyhole behaviors and weld pool fluid flow were discussed, and the result shows that, although the welding speed varies, the mechanism of keyhole collapse was similar. However, the keyhole stability at higher welding speed was improved due to reduced weld depth fluctuations, spatter number, keyhole depth to width ratio, and keyhole collapse frequency. Furthermore, the improved keyhole stability impeded the keyhole collapse, and the lower weld depth and solidification rate facilitated bubble escaping from the weld pool easily, which are the main factors for suppression of porosity at higher welding speed.


Aluminum alloy Welding speed Keyhole Porosity 


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This work was supported the Ministry of Industry and Information Technology of China under the project of LNG shipbuilding.


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© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Lijin Huang
    • 1
    • 2
  • Xueming Hua
    • 1
    • 2
    Email author
  • Dongsheng Wu
    • 1
    • 2
  • Youxiong Ye
    • 3
  1. 1.Shanghai Key Laboratory of Material Laser Processing and ModificationShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China
  2. 2.Collaborative Innovation Center for Advanced Ship and Deep-Sea ExplorationShanghaiPeople’s Republic of China
  3. 3.Department of Materials Science and EngineeringUniversity of TennesseeKnoxvilleUSA

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