整体叶盘叶片焊缝裂纹相控阵超声检测

摘要

裂纹是线性摩擦焊整体叶盘结构制造过程中叶片焊缝区域常见的缺陷类型之一.由于叶片焊缝区域结构复杂且裂纹缺陷尺寸小,因此焊缝区域裂纹缺陷的检测难度大.为了满足新工艺的应用要求,研究了焊缝区域的相控阵超声全覆盖检测方法,建立了焊缝区域相控阵超声检测的有限元仿真模型,研究了裂纹特征参数和声束聚焦点位置对检测方案的影响,验证了检测方案的可行性与正确性.构建了机器人化的相控阵超声检测系统,模拟了声束在线性摩擦焊叶片试样中的传播过程,实现了对叶片中预制裂纹缺陷的识别.研究结果表明,设计的检测方案能够满足叶片快速检测的要求.%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.