| Citation: | MA Liyin, LI Yang, ZHOU Zhengganet al. Detection of welding crack in blisk blade based on ultrasonic phased array[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(9): 1900-1908. doi: 10.13700/j.bh.1001-5965.2016.0683(in Chinese)
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Crack is a type of common defect in welding area of blade appearing in the process of blisk manufacture. Due to the complex structure of welding area in blade and the small size of crack defect, it is difficult to detect the welding crack. In order to satisfy the application requirement of this new process, a completely covered testing method, based on ultrasonic phased array inspection technique, to welding area was proposed. Finite element simulation models for phased array testing of welding area were built. The effects of crack parameters and ultrasonic beam focal position on the detection program were researched to testify the feasibility and validity of the detection program. A roboticized phased array ultrasonic testing system was established to simulate the propagation of ultrasonic beam in linear friction welding blade specimen and to achieve the recognition of prefabricated crack defects. The research results show that the proposed detection program can fulfill the requirement of rapid detection for linear friction welding blisk blade.
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