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<p>Covering a layer of colloidal water over the explosive can improve energy utilization and welding quality, but the detailed mechanisms for this technique are still open to discussion. Here, multi-group laminated composites of AA1060 foil and Q235 plate were prepared by explosive welding with varying thicknesses of colloidal water. The bonding properties including macro/micro morphologies, mechanical properties, and corrosion resistances were systematically investigated by various characterizations, and the relevant energies involving welding, jet formation, and plastic strain were studied with theoretical analyses and ALE-SPH numerical simulation. The results showed a positive correlation between the thickness of the colloidal water and the energies, but the correlation gradually weakened. As the thickness increased, the bonding interface gradually transited from flat-like shape to waveform and further evolved toward irregularity. The composite prepared with 5&#xa0;mm thick colloidal water was better in macro/ micro morphologies, while the others had various defects due to the improper energy distribution. The nanoindentation results revealed the heterogeneities of micromechanical properties quantitatively, and the electrochemical corrosion tests indicated that the anti-corrosion properties of the composites were considerably improved compared to the matrixes. This comprehensive study contributes to a deeper understanding of the explosive welding process and promotes process optimization.</p>

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Understanding the role of explosive covering in explosive welding: process behaviors, bonding properties, and energy effects

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • Junguo Wang,
  • Mengyang Li,
  • Cong Wang,
  • Xiaofei Wang,
  • Ming Yang

摘要

Covering a layer of colloidal water over the explosive can improve energy utilization and welding quality, but the detailed mechanisms for this technique are still open to discussion. Here, multi-group laminated composites of AA1060 foil and Q235 plate were prepared by explosive welding with varying thicknesses of colloidal water. The bonding properties including macro/micro morphologies, mechanical properties, and corrosion resistances were systematically investigated by various characterizations, and the relevant energies involving welding, jet formation, and plastic strain were studied with theoretical analyses and ALE-SPH numerical simulation. The results showed a positive correlation between the thickness of the colloidal water and the energies, but the correlation gradually weakened. As the thickness increased, the bonding interface gradually transited from flat-like shape to waveform and further evolved toward irregularity. The composite prepared with 5 mm thick colloidal water was better in macro/ micro morphologies, while the others had various defects due to the improper energy distribution. The nanoindentation results revealed the heterogeneities of micromechanical properties quantitatively, and the electrochemical corrosion tests indicated that the anti-corrosion properties of the composites were considerably improved compared to the matrixes. This comprehensive study contributes to a deeper understanding of the explosive welding process and promotes process optimization.