<p>To address the defect detection needs of small-diameter aluminum alloy pipe bends in aircraft pipelines, this study investigates the propagation laws of T(0,1)-mode guided waves under different bending angles. By establishing a finite element model for guided wave propagation in pipe bends at an excitation frequency of 320&#xa0;kHz, it is found that energy accumulation and mode conversion occur when guided waves propagate through the bend section: due to the length difference between the inner and outer sides of the bend, guided wave energy accumulates from the inner side to the outer side and focuses on the intersection of the outer arc and the inner extension line. The non-axisymmetry of the bend section causes part of the T(0,1) mode-guided waves (TMGW) to transform into F(1,2) mode-guided waves (FMGW) after passing through the bend, and the proportion of FMGW gradually increases with the growth of the bending angle. The propagation laws of TMGW in aluminum alloy pipe bends are experimentally verified using a 320&#xa0;kHz permanent magnet electromagnetic acoustic transducer (PPM EMAT), and the simulation results are in good agreement with the experimental findings. This study reveals the guided wave energy focusing phenomenon at pipe bends, clarifies the influence law of bending angles on TMGW propagation characteristics, and provides key theoretical basis for defect detection in aircraft pipeline systems.</p>