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<p>This study investigated similar and dissimilar butt welding of SS316L and Inconel 625. High-power diode laser welding was used without filler material. Laser welding offers precise control and helps prevent unwanted intermetallics, unlike conventional fusion methods. Microstructural analysis showed that weld zones mainly contain smaller equiaxed dendritic grains. The structure contains columnar dendrites at the fusion region &amp; equiaxed dendrites at the centre. Element redistribution occurred during dissimilar welding, causing titanium and molybdenum to segregate into the liquid phase. All optimal samples achieved high strength and elongation. The overall ultimate tensile strength (UTS) of the dissimilar joint was similar to that of 316 stainless steel. The Inconel 625 region showed the highest microhardness, up to 269 HV. Similar welds showed ductile transgranular fracture, while the dissimilar joint failed with a combination of ductile–brittle fracture. This combined fracture mode is attributed to the formation of intermetallics in the joint.</p>

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Laser Butt Welding of SS316L and Inconel 625 Alloys: Evaluation of Microstructure and Mechanical Characteristics

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • M. J. C. V. Bala Ganapathi,
  • A. V. N. L. Sharma,
  • Vishnu Vardhan T

摘要

This study investigated similar and dissimilar butt welding of SS316L and Inconel 625. High-power diode laser welding was used without filler material. Laser welding offers precise control and helps prevent unwanted intermetallics, unlike conventional fusion methods. Microstructural analysis showed that weld zones mainly contain smaller equiaxed dendritic grains. The structure contains columnar dendrites at the fusion region & equiaxed dendrites at the centre. Element redistribution occurred during dissimilar welding, causing titanium and molybdenum to segregate into the liquid phase. All optimal samples achieved high strength and elongation. The overall ultimate tensile strength (UTS) of the dissimilar joint was similar to that of 316 stainless steel. The Inconel 625 region showed the highest microhardness, up to 269 HV. Similar welds showed ductile transgranular fracture, while the dissimilar joint failed with a combination of ductile–brittle fracture. This combined fracture mode is attributed to the formation of intermetallics in the joint.