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<p>The objective of this study was to investigate the structure and characteristics of joints made from St3 steel and AMg5 aluminum–magnesium alloy, welded through explosive methods using different throwing schemes and welding parameters. Microscopy observations revealed that all samples contained a layer of molten metal at the interface of the materials, with its relative length achieving up to 100% under specific welding conditions. The average strength of the joints in ram–tensile tests was 35&#xa0;MPa, with failures typically occurring along the molten metal layer at the joint interface. In contrast, under “hard” welding conditions marked by relatively high energy inputs, the development of a wave profile led to a decrease in the length of molten areas and an enhancement in joint strength. The highest strength recorded (110&#xa0;MPa) was found in samples exhibiting the shortest relative length of molten areas at 62%. Fracture surface analysis indicated that when molten areas were absent at the joint interface, failure occurred in the aluminum alloy itself.</p>

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Characteristics of structure formation and properties of explosively welded joints of St3 steel with AMg5 aluminum–magnesium alloy

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Mikhail Korolev,
  • Evgeniy Kuzmin,
  • Valentin Kharlamov,
  • Sergei Kuzmin,
  • Vladimir Lysak

摘要

The objective of this study was to investigate the structure and characteristics of joints made from St3 steel and AMg5 aluminum–magnesium alloy, welded through explosive methods using different throwing schemes and welding parameters. Microscopy observations revealed that all samples contained a layer of molten metal at the interface of the materials, with its relative length achieving up to 100% under specific welding conditions. The average strength of the joints in ram–tensile tests was 35 MPa, with failures typically occurring along the molten metal layer at the joint interface. In contrast, under “hard” welding conditions marked by relatively high energy inputs, the development of a wave profile led to a decrease in the length of molten areas and an enhancement in joint strength. The highest strength recorded (110 MPa) was found in samples exhibiting the shortest relative length of molten areas at 62%. Fracture surface analysis indicated that when molten areas were absent at the joint interface, failure occurred in the aluminum alloy itself.