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<p>To address the challenges of frequent element segregation defects and poor welding quality/stability in dissimilar metal thin-plate welded joints, this study employed weaving gas tungsten arc (W-GTA) welding technology to conduct butt-welding experiments on 2-mm-thick Inconel 718 alloy and 316L stainless steel. Comparative analyses of macrostructure, microstructure, and mechanical properties were performed using scanning electron microscopy (SEM) and universal tensile testing. Results indicate that all joints exhibited austenite-dominated microstructures. Compared to conventional non-weaving-GTA welds, W-GTA welded joints demonstrated enhanced tensile strength and elongation. Optimal parameters (0.2&#xa0;rad/s weaving speed, 4&#xa0;mm width) minimized unmixed zone areas and ferrite layer thicknesses, achieving peak tensile strength (694&#xa0;MPa, Sample 6) and maximum elongation (27&#xa0;pct), along with the narrowest heat-affected zone (HAZ). Increased weaving speed reduced joint areas and unmixed zones. Tensile strength improved with decreasing weaving speed and angle, whereas elongation exhibited an inverse trend. Fractography revealed significant Ti-rich second-phase particles in GTA weld fractures, contributing to strength reduction. W-GTA welding effectively suppressed HAZ widening and ferrite layer formation, mitigating mechanical property degradation from brittle intermetallics and elemental segregation.</p> Graphical Abstract <p></p>

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Effect of Weaving Parameters on Microstructure and Mechanical Properties of Dissimilar Metal W-GTA Welded Joints

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Hao Tu,
  • Weifeng Xie,
  • Rui Fu,
  • Yujing Xie

摘要

To address the challenges of frequent element segregation defects and poor welding quality/stability in dissimilar metal thin-plate welded joints, this study employed weaving gas tungsten arc (W-GTA) welding technology to conduct butt-welding experiments on 2-mm-thick Inconel 718 alloy and 316L stainless steel. Comparative analyses of macrostructure, microstructure, and mechanical properties were performed using scanning electron microscopy (SEM) and universal tensile testing. Results indicate that all joints exhibited austenite-dominated microstructures. Compared to conventional non-weaving-GTA welds, W-GTA welded joints demonstrated enhanced tensile strength and elongation. Optimal parameters (0.2 rad/s weaving speed, 4 mm width) minimized unmixed zone areas and ferrite layer thicknesses, achieving peak tensile strength (694 MPa, Sample 6) and maximum elongation (27 pct), along with the narrowest heat-affected zone (HAZ). Increased weaving speed reduced joint areas and unmixed zones. Tensile strength improved with decreasing weaving speed and angle, whereas elongation exhibited an inverse trend. Fractography revealed significant Ti-rich second-phase particles in GTA weld fractures, contributing to strength reduction. W-GTA welding effectively suppressed HAZ widening and ferrite layer formation, mitigating mechanical property degradation from brittle intermetallics and elemental segregation.

Graphical Abstract