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<p>With the widespread application of high-strength steel in the industrial field, it is crucial to improve its performance. This paper studies the influence of alternating magnetic field on the arc, droplet, microstructure, and mechanical properties of high-strength steel MAG weld overlay metal. The results show that after applying an alternating magnetic field in MAG welding, the welding arc exhibits periodic changes, with the arc shape switching between conical and bell-shaped, and the arc rotates clockwise and counterclockwise at high-speed periodically. As the magnetic field strength increases, the arc contracts. The addition of an alternating magnetic field can effectively refine the grains and increase the proportion of acicular ferrite microstructure. When the magnetic field strength is between 0 and 15mT, the comprehensive mechanical properties of the weld overlay metal first increase and then decrease with the increase in magnetic field strength. When the magnetic field strength is greater than 15mT, the mechanical properties decrease. Keeping the magnetic field strength constant and increasing the magnetic field frequency, the period of the alternating changes in the welding arc shape becomes shorter, the oscillation amplitude decreases, and the comprehensive mechanical properties of the weld overlay metal are improved. When the alternating magnetic field parameters are 15mT and 40&#xa0;Hz, the comprehensive mechanical properties are optimal. At this time, the texture types are {110} &lt;112&gt; texture and {111} &lt;112&gt; texture. Compared with no magnetic field, the average grain size is reduced by 16.2%, the plasticity is increased by 40%, and the low-temperature impact toughness is increased by 61%.</p>

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Research on the Synergistic Enhancement of Plasticity and Strength of High-Strength Steel Weld Overlay Metal Based on Alternating Magnetic Field

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Qianwen Hu,
  • Jinjie Wang,
  • Yong Zhao,
  • Feiyun Wang,
  • Juan Fu,
  • Fugang Chen

摘要

With the widespread application of high-strength steel in the industrial field, it is crucial to improve its performance. This paper studies the influence of alternating magnetic field on the arc, droplet, microstructure, and mechanical properties of high-strength steel MAG weld overlay metal. The results show that after applying an alternating magnetic field in MAG welding, the welding arc exhibits periodic changes, with the arc shape switching between conical and bell-shaped, and the arc rotates clockwise and counterclockwise at high-speed periodically. As the magnetic field strength increases, the arc contracts. The addition of an alternating magnetic field can effectively refine the grains and increase the proportion of acicular ferrite microstructure. When the magnetic field strength is between 0 and 15mT, the comprehensive mechanical properties of the weld overlay metal first increase and then decrease with the increase in magnetic field strength. When the magnetic field strength is greater than 15mT, the mechanical properties decrease. Keeping the magnetic field strength constant and increasing the magnetic field frequency, the period of the alternating changes in the welding arc shape becomes shorter, the oscillation amplitude decreases, and the comprehensive mechanical properties of the weld overlay metal are improved. When the alternating magnetic field parameters are 15mT and 40 Hz, the comprehensive mechanical properties are optimal. At this time, the texture types are {110} <112> texture and {111} <112> texture. Compared with no magnetic field, the average grain size is reduced by 16.2%, the plasticity is increased by 40%, and the low-temperature impact toughness is increased by 61%.