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<p>The purpose of this research is to enhance the dissimilar weld microstructure and the corresponding mechanical properties of SS316Ti and Inconel 718 joints. High-grade austenitic stainless steel SS 316 Ti and nickel-based alloy Inconel 718 are increasingly employed in aerospace, power generation, and chemical processing applications where high temperatures and chemical reactions are likely to occur. Dissimilar weld joints were produced using TIG welding, aided by ultrasonic vibration, across a wide range of welding parameters, specifically HI 25&#xa0;KJ/cm and 50&#xa0;KJ/cm, combined with an ultrasonic frequency of 20&#xa0;Hz and wattage levels of 0&#xa0;W, 250&#xa0;W, and 500&#xa0;W. The results of the dissimilar welds were reported in terms of weld microstructure and mechanical properties, including hardness, impact resistance, and tensile strength. It is noteworthy that the microstructure of TIG weldments is heterogeneous, featuring a high-strain region in comparison with the base metal and TIG weldments. On the other hand, UV-TIG weldments exhibit more homogeneous microstructures as the ultrasonic frequency increases, which reduces the fraction of the strained region and helps to reduce heterogeneity in weld microstructure. Therefore, the overall mechanical properties of UV-TIG weldments are enhanced when compared to those of TIG weldments. It has been found that the fractographic morphologies contribute positively to the microstructural and mechanical characteristics. The integration of TIG welding settings and parameters for ultrasonic vibration assistance has been recognized for various applications.</p>

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Improvement of the Weld Structure and Mechanical Properties of Dissimilar Joint of SS316Ti and Inconel 718 Alloys Using Tungsten Inert Gas Assisted with Ultrasonic Vibration

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Sanjeev Kumar

摘要

The purpose of this research is to enhance the dissimilar weld microstructure and the corresponding mechanical properties of SS316Ti and Inconel 718 joints. High-grade austenitic stainless steel SS 316 Ti and nickel-based alloy Inconel 718 are increasingly employed in aerospace, power generation, and chemical processing applications where high temperatures and chemical reactions are likely to occur. Dissimilar weld joints were produced using TIG welding, aided by ultrasonic vibration, across a wide range of welding parameters, specifically HI 25 KJ/cm and 50 KJ/cm, combined with an ultrasonic frequency of 20 Hz and wattage levels of 0 W, 250 W, and 500 W. The results of the dissimilar welds were reported in terms of weld microstructure and mechanical properties, including hardness, impact resistance, and tensile strength. It is noteworthy that the microstructure of TIG weldments is heterogeneous, featuring a high-strain region in comparison with the base metal and TIG weldments. On the other hand, UV-TIG weldments exhibit more homogeneous microstructures as the ultrasonic frequency increases, which reduces the fraction of the strained region and helps to reduce heterogeneity in weld microstructure. Therefore, the overall mechanical properties of UV-TIG weldments are enhanced when compared to those of TIG weldments. It has been found that the fractographic morphologies contribute positively to the microstructural and mechanical characteristics. The integration of TIG welding settings and parameters for ultrasonic vibration assistance has been recognized for various applications.