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<p>This study investigates the Mechanical and Metallurgical Analysis of Preheated AISI 304/316 Rotary Friction Welded Joints. The welding process was performed under varying rotational speeds (692, 832, and 1228 RPM), burn-off lengths (6, 9, and 12&#xa0;mm), and forge times (30-60&#xa0;sec). Tensile strength analysis revealed that the highest tensile stress of 489.19&#xa0;MPa was obtained at 1228 RPM, 12&#xa0;mm burn-off length, and a forge time of 50-60&#xa0;sec, as determined using signal-to-noise ratio analysis in Minitab software. Micro-hardness analysis demonstrated that hardness peaked at the weld interface, with values increasing with burn-off length and rotational speed, reaching a maximum of 309&#xa0;HV. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis confirmed a transition from brittle to ductile fracture with increasing welding temperature, attributed to the formation of an FCC (Face-Centered Cubic) structure at elevated temperatures. The study concludes that preheating significantly influences the mechanical properties and fracture behaviour of welded joints, making it a viable approach for enhancing weld quality in industrial applications.</p>

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Mechanical and Metallurgical Analysis of Preheated AISI 304/316 Rotary Friction Welded Joints

  • 期刊论文

  • 发表日期：

    2025年11月23日

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  • Jagjeet Singh Chatha,
  • Amit Handa

摘要

This study investigates the Mechanical and Metallurgical Analysis of Preheated AISI 304/316 Rotary Friction Welded Joints. The welding process was performed under varying rotational speeds (692, 832, and 1228 RPM), burn-off lengths (6, 9, and 12 mm), and forge times (30-60 sec). Tensile strength analysis revealed that the highest tensile stress of 489.19 MPa was obtained at 1228 RPM, 12 mm burn-off length, and a forge time of 50-60 sec, as determined using signal-to-noise ratio analysis in Minitab software. Micro-hardness analysis demonstrated that hardness peaked at the weld interface, with values increasing with burn-off length and rotational speed, reaching a maximum of 309 HV. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis confirmed a transition from brittle to ductile fracture with increasing welding temperature, attributed to the formation of an FCC (Face-Centered Cubic) structure at elevated temperatures. The study concludes that preheating significantly influences the mechanical properties and fracture behaviour of welded joints, making it a viable approach for enhancing weld quality in industrial applications.