Mechanized HFMI for improved fatigue life in complex weld shapes

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
T. Stenberg, G. Hultgren, Y. Banno, Z. Barsoum
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引用次数: 0

Abstract

This study investigates the implementation of mechanized high-frequency mechanical impact (HFMI) treatments to enhance the fatigue life of complex welded structures. Digital visual inspection and path planning are utilized through digital laser scanning system to automate the HFMI process for more complex weld shapes in S355 steel grade, such as circular weld seams, which are more challenging to treat consistently. The mechanized HFMI setup was calibrated to ensure precise alignment and consistent application of the HFMI tool along the weld toe line. Finite element analysis was used to simulate the HFMI process, focusing on the effects of multi-pass HFMI treatments and optimizing treatment parameters. The simulations identified fatigue initiation sites which were confirmed with the mechanized HFMI treated specimens. Fatigue testing of both as-welded and HFMI-treated samples was conducted, revealing significant improvements in fatigue strength for the HFMI-treated specimens, which is in line with IIW recommendations. The fatigue test results were also compared with previous testing of manually treated samples. It was concluded that the fatigue life scatter, expressed in log C (load capacity), resulted in a smaller standard deviation for the mechanically HFMI-treated samples than the manually treated samples. Geometric measurements from laser scanning post-HFMI treatment also indicated reduced scatter in weld toe radius and HFMI groove depth compared to manual treatments, demonstrating the robustness and consistency of the mechanized process.

机械化HFMI提高了复杂焊缝形状的疲劳寿命
本研究探讨了采用机械化高频机械冲击(HFMI)处理来提高复杂焊接结构的疲劳寿命。数字激光扫描系统利用数字目视检查和路径规划,实现了S355钢等级中更复杂焊缝形状(如圆形焊缝)HFMI过程的自动化,这种焊缝的一致性处理更具挑战性。对机械化HFMI装置进行了校准,以确保HFMI工具沿着焊接趾线精确对准和一致的应用。采用有限元模拟方法,重点研究了多道次HFMI处理的效果及处理参数的优化。模拟确定了疲劳起始点,并与机械HFMI处理后的试样进行了验证。对焊接状态和hfmi处理后的试样进行了疲劳测试,结果表明,hfmi处理后的试样的疲劳强度有了显著提高,这符合IIW的建议。并将疲劳试验结果与以往手工处理试样进行了比较。结果表明,用log C(载荷能力)表示的疲劳寿命散射导致机械hfmi处理样品的标准偏差小于人工处理样品。HFMI处理后的激光扫描几何测量也表明,与手工处理相比,焊接脚趾半径和HFMI槽深的散射减少,证明了机械化过程的稳健性和一致性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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