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<p>In this study, first ultrasonic vibrations have been applied longitudinally and uniformly perpendicular to the weld line as an efficient method in the UV-GMAW of S700MC steel. Then the effect of ultrasonic transducer power, voltage, and feed rate parameters have been investigated on the elongation, ultimate tensile strength, and toughness of the welded joints in the UV-GMAW of S700MC high strength steel using experimental and statistical approach. The statistical analysis of the data clearly shows that the mean value of elongation and toughness of welded joints by UV-GMAW reaches its maximum value under high ultrasonic transducer power that is 30%, low voltage that is 18&#xa0;V, and high feed rate that is 300 Ipm, while the most value happens for UTS under such conditions only by changing voltage at 20&#xa0;V. Furthermore, the results of the comparative study show that the values of elongation, ultimate tensile strength, and toughness of the welded joints by UV-GMAW are more than those of the welded joints by GMAW 68.11%, 40.47%, and 561.48%, respectively. This is because of the effect of ultrasonic vibrations which change the microstructure of S700MC steel from coarse-grained dendritic to fine-grained dendritic.</p>

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Experimental and statistical study on mechanical properties of ultrasonic vibration -assisted gas metal arc welded joint of S700MC steel

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Abbas Pak,
  • Hamid Shams,
  • Hamid Reza Rezaei Ashtiani,
  • Yahya Choopani

摘要

In this study, first ultrasonic vibrations have been applied longitudinally and uniformly perpendicular to the weld line as an efficient method in the UV-GMAW of S700MC steel. Then the effect of ultrasonic transducer power, voltage, and feed rate parameters have been investigated on the elongation, ultimate tensile strength, and toughness of the welded joints in the UV-GMAW of S700MC high strength steel using experimental and statistical approach. The statistical analysis of the data clearly shows that the mean value of elongation and toughness of welded joints by UV-GMAW reaches its maximum value under high ultrasonic transducer power that is 30%, low voltage that is 18 V, and high feed rate that is 300 Ipm, while the most value happens for UTS under such conditions only by changing voltage at 20 V. Furthermore, the results of the comparative study show that the values of elongation, ultimate tensile strength, and toughness of the welded joints by UV-GMAW are more than those of the welded joints by GMAW 68.11%, 40.47%, and 561.48%, respectively. This is because of the effect of ultrasonic vibrations which change the microstructure of S700MC steel from coarse-grained dendritic to fine-grained dendritic.