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<p>During the explosive welding of thick aluminum plates, excessive energy deposition at the bonding interface promotes the formation of thick intermetallic compounds (IMCs), which significantly deteriorate weld quality by impairing mechanical properties and potentially causing joint failure. To address this issue, this study employed Q235B steel as an intermediate buffer layer to mitigate energy deposition at the Al/Fe interface during explosive welding, thereby reducing the thickness of the excessive molten layer and improving joint integrity. The interfacial microstructure was systematically characterized using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). In addition, the chemical composition across the interface was analyzed by electron probe microanalysis (EPMA). Mechanical tests were conducted to evaluate the interlayer's effect on interfacial bonding. The results indicated that a thin interlayer could significantly reduce the energy generated at the interface, thereby controlling excessive melting. Microstructural and mechanical property evaluations of explosively welded 15-mm A1050/1-mm Q235B/40-mm Q235B and 15-mm A1050/2-mm Q235B/40-mm Q235B composite plates indicated good bonding quality and formation of IMCs at the aluminium-steel interface. Mechanical property tests demonstrated that the 1-mm interlayer composite plate achieved an average shear strength of 53.1&#xa0;MPa, representing an over 50% improvement compared to the A1050 aluminum substrate. Furthermore, its bending strength exhibited only an 8% difference between the aluminum and steel sides, which was significantly lower than the 35% difference observed in the 2-mm interlayer samples. Overall, the 1-mm interlayer composite plate demonstrated superior mechanical performance compared to its 2-mm counterpart.</p>

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Research on Explosive Welding of A1050/Q235B Using Q235B as an Interlayer

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Haojie Guo,
  • Guichun Zhu,
  • Xiangyu Zeng,
  • Linghe Meng,
  • Guofeng Liang,
  • Jianian Hu,
  • Xiang Chen

摘要

During the explosive welding of thick aluminum plates, excessive energy deposition at the bonding interface promotes the formation of thick intermetallic compounds (IMCs), which significantly deteriorate weld quality by impairing mechanical properties and potentially causing joint failure. To address this issue, this study employed Q235B steel as an intermediate buffer layer to mitigate energy deposition at the Al/Fe interface during explosive welding, thereby reducing the thickness of the excessive molten layer and improving joint integrity. The interfacial microstructure was systematically characterized using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). In addition, the chemical composition across the interface was analyzed by electron probe microanalysis (EPMA). Mechanical tests were conducted to evaluate the interlayer's effect on interfacial bonding. The results indicated that a thin interlayer could significantly reduce the energy generated at the interface, thereby controlling excessive melting. Microstructural and mechanical property evaluations of explosively welded 15-mm A1050/1-mm Q235B/40-mm Q235B and 15-mm A1050/2-mm Q235B/40-mm Q235B composite plates indicated good bonding quality and formation of IMCs at the aluminium-steel interface. Mechanical property tests demonstrated that the 1-mm interlayer composite plate achieved an average shear strength of 53.1 MPa, representing an over 50% improvement compared to the A1050 aluminum substrate. Furthermore, its bending strength exhibited only an 8% difference between the aluminum and steel sides, which was significantly lower than the 35% difference observed in the 2-mm interlayer samples. Overall, the 1-mm interlayer composite plate demonstrated superior mechanical performance compared to its 2-mm counterpart.