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Abstract <p>Based on the principles of acoustoelasticity, the critically refracted longitudinal (L<sub>CR</sub>) wave ultrasonic method for detecting planar principal stresses in isotropic materials is derived through a&#xa0;combination of theoretical derivation and experimental validation. The influence of various welding parameters on the residual stresses in welded workpieces is analyzed using finite element simulation software. The results indicate that the maximum equivalent stress in the weld seam is inversely proportional to the welding speed and directly proportional to the welding current. Subsequently, two SUS301L austenitic stainless steel plates are selected as the welding materials, and metal inert gas (MIG) welding is employed for flat plate welding. Residual stresses in different regions of the welded workpieces are measured using a three-directional ultrasonic testing method and validated against the simulation data. A high degree of agreement is observed between the two, thereby demonstrating the feasibility of this ultrasonic method for detecting planar stress.</p>

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Detection of Welding Residual Stress of Stainless Steel Based on Critically Refracted Longitudinal Wave Method

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Ting Ma,
  • Guocheng Xu,
  • Juan Dong,
  • Xiaopeng Gu,
  • Guanghao Zhou,
  • Qiuyue Fan

摘要

Abstract

Based on the principles of acoustoelasticity, the critically refracted longitudinal (LCR) wave ultrasonic method for detecting planar principal stresses in isotropic materials is derived through a combination of theoretical derivation and experimental validation. The influence of various welding parameters on the residual stresses in welded workpieces is analyzed using finite element simulation software. The results indicate that the maximum equivalent stress in the weld seam is inversely proportional to the welding speed and directly proportional to the welding current. Subsequently, two SUS301L austenitic stainless steel plates are selected as the welding materials, and metal inert gas (MIG) welding is employed for flat plate welding. Residual stresses in different regions of the welded workpieces are measured using a three-directional ultrasonic testing method and validated against the simulation data. A high degree of agreement is observed between the two, thereby demonstrating the feasibility of this ultrasonic method for detecting planar stress.