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<p>Welding is commonly used in the shipbuilding industry. However, the presence of tensile residual stresses potentially reduces the service life of structures. This study deals with the subject of relief of tensile residual stresses by subjecting the Tungsten inert gas (TIG) and Metal inert gas (MIG) welded DMR249A steel surface to the Ultrasonic Impact Treatment (UIT) process. Initial residual stress measurement by the cosα method revealed the presence of average tensile residual stresses of about 470&#xa0;MPa and 397&#xa0;MPa in the TIG and MIG welded samples, respectively. Later, upon application of the UIT process, the tensile residual stresses were relieved, leading to the development of average compressive residual stress of about 383&#xa0;MPa and 279&#xa0;MPa in the TIG and MIG welded samples, respectively. Use of electron backscatter diffraction (EBSD), the UIT-treated samples showed improved grain refinement. The tensile strength of UIT-treated welded joints improved by 10% compared to the as-welded joints. Significant increase in the average hardness of the post-UIT-treated TIG and MIG samples to 400 VHN and 320 VHN, respectively, compared to the as-welded samples were seen. Significant improvement in the mechanical properties were also seen with the application of the UIT process. Mention may also be made of the performance of fractography studies using Scanning Electron Microscopy (SEM) analysis.</p>

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Effect of Ultrasonic Impact Treatment on the Residual Stress and Mechanical Properties of Naval Grade High-Strength Low-Alloy Steel Welded Joints

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • I. R. Sugumaran,
  • G. B. Bhaskar,
  • G. K. Janani,
  • S. R. Koteswara Rao

摘要

Welding is commonly used in the shipbuilding industry. However, the presence of tensile residual stresses potentially reduces the service life of structures. This study deals with the subject of relief of tensile residual stresses by subjecting the Tungsten inert gas (TIG) and Metal inert gas (MIG) welded DMR249A steel surface to the Ultrasonic Impact Treatment (UIT) process. Initial residual stress measurement by the cosα method revealed the presence of average tensile residual stresses of about 470 MPa and 397 MPa in the TIG and MIG welded samples, respectively. Later, upon application of the UIT process, the tensile residual stresses were relieved, leading to the development of average compressive residual stress of about 383 MPa and 279 MPa in the TIG and MIG welded samples, respectively. Use of electron backscatter diffraction (EBSD), the UIT-treated samples showed improved grain refinement. The tensile strength of UIT-treated welded joints improved by 10% compared to the as-welded joints. Significant increase in the average hardness of the post-UIT-treated TIG and MIG samples to 400 VHN and 320 VHN, respectively, compared to the as-welded samples were seen. Significant improvement in the mechanical properties were also seen with the application of the UIT process. Mention may also be made of the performance of fractography studies using Scanning Electron Microscopy (SEM) analysis.