Citation: | ZHOU Zhenggan, TENG Lichen, LI Yanget al. Dual-linear-array TFM ultrasonic imaging method for weld defects of complex structure[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2407-2413. doi: 10.13700/j.bh.1001-5965.2020.0464(in Chinese) |
A certain type of superalloy disk component of aero-engine is welded by the turbine disk and the outer integral blade ring, and when the conventional single-channel ultrasonic method is used to detect welding surface defects, there are problems such as low detection resolution and poor signal-to-noise ratio. For this reason, a detection scheme using dual-linear-array transducer is proposed. The Total Focusing Method (TFM) is used to image and characterize welding surface defects. Unlike the conventional TFM, the array aperture and waveform pattern can be dynamically changed with the detection depth, and the optimal parameters are determined by theoretical simulation. Samples of aero-engine superalloy disk with embedded defects were prepared, and testing experiments were carried out. The results show that the proposed dual-linear-array TFM ultrasonic imaging method can effectively improve the detection ability of unwelded area defects in superalloy disk and is a feasible detection scheme.
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