Coupling effect of dynamic power and oscillation path on butt weld formation and melt flow behavior during aluminum alloys

Jiangmei Cui, J. P. Oliveira, Bowen Pang, Jiajia Shen, Zhi Zeng

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Abstract

The influence of the coupling effect between dynamic power and oscillation path on the formation of weld seams and the fluid behavior of the molten pool during laser welding of 5A06 aluminum alloy was investigated through numerical simulation and experimentation. Three power modes were compared in the experiments: equal power (EP), delayed dynamic power (D-DP), and non-delayed dynamic power (ND-DP). The experimental results show that both D-DP and ND-DP modes are favorable to improve the mechanical properties. Among them, the joints formed under the D-DP mode exhibit the best mechanical properties, with an average tensile strength reaching ≈ 99.1% of the base material, which is an increase of ≈ 35.3% and ≈ 5.6% compared to the EP and ND-DP modes, respectively. Numerical simulation results indicate that the D-DP mode effectively mitigates the average flow velocity of the molten pool, reduces the collision effects between liquid flows, suppresses the impact of fluid on the keyhole walls, and improves the stability of the keyhole and the welding process, thereby enhancing the mechanical properties of the joints.
Original languageEnglish
Article number111687
Number of pages10
JournalOptics And Laser Technology
Volume181
DOIs
Publication statusPublished - Feb 2025

Keywords

  • Dynamic power
  • Keyhole effect
  • Laser oscillating welding
  • Melt flow behavior

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