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<p>Welding processes generate residual stresses due to heterogeneous plastic or elastic deformations. The effect of residual stresses can be beneficial or detrimental depending on their magnitude, type and distribution.&#xa0;Tensile residual stresses are particularly detrimental as they contribute to fatigue crack nucleation and propagation. Vibration Stress Relief (VSR) is a technique that alleviates these stresses through cyclic loading, avoiding the distortions or microstructural changes seen in heat treatments. LNE 380 steel, a hot-rolled HSLA steel used in the automotive industry, offers good toughness and weldability. This study focuses on the experimental and statistical analysis of the effect of VSR on residual stress in LNE 380 welded joints made by the GTAW process. Vibration frequencies, determined via Finite Element Method (FEM) modal simulation, included resonant and sub-resonant frequencies. Residual stresses were measured using x-ray diffraction with the sin<sup>2</sup>ψ method. Results showed a 61% average reduction in residual stress with sub-resonant frequency and high acceleration amplitude applied for 10 minutes, while a 75% reduction was achieved at resonant frequencies. Analysis of Variance (ANOVA) was performed considering two factors (Applied Frequency and Amplitude) in two levels, confirming the significance of the results.</p> Graphical Abstract <p></p>

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Analysis of the Residual Stress Relief by Mechanical Vibration in High-Strength Low-Alloy Steel Welded Joints

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Maria Cindra Fonseca,
  • Danilo Cesar Monteiro,
  • Paola Rodrigues Pereira,
  • Pedro M. Calas Pacheco,
  • Tatiane de Campos Chuvas

摘要

Welding processes generate residual stresses due to heterogeneous plastic or elastic deformations. The effect of residual stresses can be beneficial or detrimental depending on their magnitude, type and distribution. Tensile residual stresses are particularly detrimental as they contribute to fatigue crack nucleation and propagation. Vibration Stress Relief (VSR) is a technique that alleviates these stresses through cyclic loading, avoiding the distortions or microstructural changes seen in heat treatments. LNE 380 steel, a hot-rolled HSLA steel used in the automotive industry, offers good toughness and weldability. This study focuses on the experimental and statistical analysis of the effect of VSR on residual stress in LNE 380 welded joints made by the GTAW process. Vibration frequencies, determined via Finite Element Method (FEM) modal simulation, included resonant and sub-resonant frequencies. Residual stresses were measured using x-ray diffraction with the sin2ψ method. Results showed a 61% average reduction in residual stress with sub-resonant frequency and high acceleration amplitude applied for 10 minutes, while a 75% reduction was achieved at resonant frequencies. Analysis of Variance (ANOVA) was performed considering two factors (Applied Frequency and Amplitude) in two levels, confirming the significance of the results.

Graphical Abstract