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<p>Welding of dissimilar materials, such as copper (Cu) and stainless steel (SS304L), is difficult due to their distinct chemical, physical, and thermal properties. This study analyzes the weldability of Cu-SS304L joints fabricated by Tungsten Inert Gas welding (TIG), with and without the addition of silicon carbide (SiC) particles. A comprehensive set of tests, including tensile strength, strain hardening, micro-hardness, nano-hardness, fractography, microstructural analysis, EDS, XRD, and electrochemical corrosion testing, was conducted to assess the mechanical, microstructural, and corrosion properties of the joints. Tensile tests indicated that the addition of SiC resulted in higher ultimate tensile strength (UTS) and yield strength (YS), enhancing the mechanical properties of the joints. Strain hardening behavior confirmed increased resistance of SiC-modified joints toward strain, demonstrating improved material strength. Micro-hardness and nano-hardness tests verify an increase in hardness value of the weld region by adding SiC paste, indicating a strengthening effect. Fractographic investigation indicated ductile failure in both instances; still, joints incorporating SiC particles indicated finer dimples, depicting enhanced toughness. Microstructural studies, complemented by EDS and XRD analysis, revealed the occurrence of intermetallic phases at the Cu-SS304L interface, such as Cu-Fe and Cr-based phases. Finally, an electrochemical corrosion test indicated that joints with SiC had greater corrosion resistance than pure Cu–SS joints. These results identify the efficacy of SiC addition in enhancing the mechanical, microstructural, and corrosion characteristics of Cu-SS304L GTAW joints.</p>

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Effect of SiC Addition on the Corrosion and Mechanical Properties of Cu-304L SS Weld Joints

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Zawed Alam,
  • Sudhansu Sekhar Panda

摘要

Welding of dissimilar materials, such as copper (Cu) and stainless steel (SS304L), is difficult due to their distinct chemical, physical, and thermal properties. This study analyzes the weldability of Cu-SS304L joints fabricated by Tungsten Inert Gas welding (TIG), with and without the addition of silicon carbide (SiC) particles. A comprehensive set of tests, including tensile strength, strain hardening, micro-hardness, nano-hardness, fractography, microstructural analysis, EDS, XRD, and electrochemical corrosion testing, was conducted to assess the mechanical, microstructural, and corrosion properties of the joints. Tensile tests indicated that the addition of SiC resulted in higher ultimate tensile strength (UTS) and yield strength (YS), enhancing the mechanical properties of the joints. Strain hardening behavior confirmed increased resistance of SiC-modified joints toward strain, demonstrating improved material strength. Micro-hardness and nano-hardness tests verify an increase in hardness value of the weld region by adding SiC paste, indicating a strengthening effect. Fractographic investigation indicated ductile failure in both instances; still, joints incorporating SiC particles indicated finer dimples, depicting enhanced toughness. Microstructural studies, complemented by EDS and XRD analysis, revealed the occurrence of intermetallic phases at the Cu-SS304L interface, such as Cu-Fe and Cr-based phases. Finally, an electrochemical corrosion test indicated that joints with SiC had greater corrosion resistance than pure Cu–SS joints. These results identify the efficacy of SiC addition in enhancing the mechanical, microstructural, and corrosion characteristics of Cu-SS304L GTAW joints.