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<p>This study explored the use of tungsten inert gas (TIG) welding to join selective laser melting (SLM) 304L stainless steel with wrought 304L stainless steel. The research evaluated the microstructure, microhardness, tensile properties, and corrosion resistance of the welded joints compared to the base materials. The results indicated that the joints achieved full penetration without internal defects. The SLM 304L exhibited columnar <i>γ</i>-austenite grains, while the wrought 304L displayed finer equiaxed <i>γ</i>-austenite with dispersed <i>δ</i>-ferrite. The weld zones consisted mainly of <i>γ</i>-austenite with minor <i>δ</i>-ferrite, influenced by heat input and thermal conductivity of the base materials. The welded joints had lower yield strength (~270 MPa), ultimate tensile strength (~600 MPa), and elongation (~40%) compared to the base materials, but better pitting corrosion resistance due to higher Cr and Mo content in the filler wire. A moderate welding speed (1.5&#xa0;mm/s) helps to obtain a stable welding heat input, achieving an optimal balance between microstructure, mechanical properties, and corrosion resistance. This study provides a feasible reference for the repair of ultra-low-carbon 304L stainless steel parts in industry.</p> Graphical Abstract <p></p>

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Tungsten Inert Gas Welding Performance of 304L Stainless Steel Manufactured by Selective Laser Melting with Wrought Ones

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Xin Zheng,
  • Kai Zhao,
  • Jie Jing,
  • Chun Tian,
  • Jiyuan Zhang,
  • Haoning Xu,
  • Hongbo Li

摘要

This study explored the use of tungsten inert gas (TIG) welding to join selective laser melting (SLM) 304L stainless steel with wrought 304L stainless steel. The research evaluated the microstructure, microhardness, tensile properties, and corrosion resistance of the welded joints compared to the base materials. The results indicated that the joints achieved full penetration without internal defects. The SLM 304L exhibited columnar γ-austenite grains, while the wrought 304L displayed finer equiaxed γ-austenite with dispersed δ-ferrite. The weld zones consisted mainly of γ-austenite with minor δ-ferrite, influenced by heat input and thermal conductivity of the base materials. The welded joints had lower yield strength (~270 MPa), ultimate tensile strength (~600 MPa), and elongation (~40%) compared to the base materials, but better pitting corrosion resistance due to higher Cr and Mo content in the filler wire. A moderate welding speed (1.5 mm/s) helps to obtain a stable welding heat input, achieving an optimal balance between microstructure, mechanical properties, and corrosion resistance. This study provides a feasible reference for the repair of ultra-low-carbon 304L stainless steel parts in industry.

Graphical Abstract