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<p>In this study, the optimization of welding parameters, pore defects, microstructure, and mechanical properties of Ti6Al4V welded joints subjected to ultrasonic-assisted laser welding was studied. The optimal parameter combination and the most significant factor influencing the tensile strength of the joint were determined by three-factor and three-level Taguchi experiments with range and variance analysis methods. A control experiment was set up under the optimal parameters to reveal the reason for ultrasonic influence on joint strength from the pore defects and microstructure. The control test showed that the cavitation effect and acoustic streaming effect of ultrasound could significantly improve the weld defects and microstructure. Compared with no ultrasound, the porosity of the welded joint decreased from 3.06 to 0.08%, and the average grain size of prior-β and α′ martensite was refined by 15.1% and 6.7%, respectively, under an ultrasonic power of 1000 W. Ultrasonic vibration improved the grain orientation of α phase and β phase and promoted the transition from LAGBs to HAGBs. When the ultrasonic power increased from 0 to 1000 W, the tensile strength of the joint increased from 920.1 to 997.2 MPa, which increased by 8.38%.</p>

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Optimization of process parameters for ultrasonic-assisted laser welding of Ti6 Al4 V and the impact of ultrasonic power on porosity, microstructure, and mechanical properties

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Yue Chen,
  • Congyi Liang,
  • Haozhong Lin,
  • Haoyuan Tan,
  • Longfei Zhang,
  • Wei Wei,
  • Jun Zhou

摘要

In this study, the optimization of welding parameters, pore defects, microstructure, and mechanical properties of Ti6Al4V welded joints subjected to ultrasonic-assisted laser welding was studied. The optimal parameter combination and the most significant factor influencing the tensile strength of the joint were determined by three-factor and three-level Taguchi experiments with range and variance analysis methods. A control experiment was set up under the optimal parameters to reveal the reason for ultrasonic influence on joint strength from the pore defects and microstructure. The control test showed that the cavitation effect and acoustic streaming effect of ultrasound could significantly improve the weld defects and microstructure. Compared with no ultrasound, the porosity of the welded joint decreased from 3.06 to 0.08%, and the average grain size of prior-β and α′ martensite was refined by 15.1% and 6.7%, respectively, under an ultrasonic power of 1000 W. Ultrasonic vibration improved the grain orientation of α phase and β phase and promoted the transition from LAGBs to HAGBs. When the ultrasonic power increased from 0 to 1000 W, the tensile strength of the joint increased from 920.1 to 997.2 MPa, which increased by 8.38%.