Vortex waves carrying quantized orbital angular momentum (OAM) have been extensively studied in optical and acoustic systems, yet their realization in fully vectorial elastic media is generally hindered by intrinsic longitudinal-transverse coupling. Here, we introduce a cut-and-glue topological lattice defect (TLD) in a three-dimensional elastic Weyl phononic crystal and realize a defect-bound mode propagating along the defect line with a vortex phase structure. The TLD preserves axial translational symmetry, giving rise to a one-dimensional defect band dispersing with ${\mathit{k}}_{\mathit{z}}$ that topologically connects a pair of Weyl points with opposite chirality in momentum space. The resulting defect-bound mode is strongly localized at the defect core, carries a well-defined OAM with winding number $\ell =1$, and maintains longitudinal-dominant polarization across the entire defect band. These findings establish a bulk-defect topological mechanism for robust OAM-guided transport in fully vectorial three-dimensional elastic media.

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• Mechanical & acoustical properties
• Mechanical metamaterials
• Topological defects
• Topological effects in acoustic systems
• Vortex flows
• 3-dimensional systems
• Metamaterials
• Phononic crystals
• Topological materials
• Weyl semimetal