高强度螺栓是汽车、钢结构等的重要紧固件, 其质量直接关系到汽车、钢结构的安全性和可靠性。提出一种基于涡流传感器阵列的扫描成像检测系统, 用于检测高强度螺栓头杆结合部裂纹。与传统的机械旋转螺栓涡流检测系统相比, 该系统能快速检测出周向裂纹, 单次扫查覆盖的检测区域更大, 大大减小了机械结构的复杂性, 降低了误检率。提出的被检区域实时扫描检测图像系统, 也为其它大批量零部件裂纹检测提供了一种有效的解决途径。

High strength bolt is the important fastener of automobile and steel structure and its quality directly affects the safety and reliability of the automobile and steel structure. After treatment process such as quenching and tempering, cracks occur in bolt. In the process of installation and using, bolt undertakes complicated stress. So the cracks (especially cracks in bolt root) will finally cause failure and fracture of bolt , which have serious consequence in use. A bolts scanning testing imaging system based on the eddy current array probe was introduced, which specializes in high strength bolt root crack detection. The system could effectively detect the cracks in bolt root so as to prevent the accidents happen. Compared to traditional mechanical rotary bolt eddy current testing system, this system could detect the circumferential crack quickly in lower mistaken rate, and with larger scan coverage, the system has simpler mechanical device. Using real time scanning testing imaging system is also a good solution to mass parts detection.