螺栓广泛应用于火电、风电等部件的连接上，在役使用过程中需承受复杂的应力、温度等作用，容易出现断裂或失效。如何在不拆卸螺栓的情况下，检测出螺栓的疲劳裂纹始终是个难题。结合理论分析，分别研究了导波相控阵和超声相控阵检测螺栓的关键技术，制定了在役螺栓的检测工艺和方案，实现了在役螺栓的检测全覆盖，解决了在役螺栓检测难题。

Bolts are widely used for the connection of components in such as thermal power and wind power. They are subjected to complex stresses and temperatures during service and are likely to cause bolt breakage or failure. Their safety has received more and more attention. How to detect the fatigue crack of the bolt without its removing is always a problem. In this paper, combined with theoretical analysis, the key technologies of guided wave phased array and ultrasonic phased array detection of bolts are studied respectively. The in-service bolt detection process and scheme are developed to realize the full coverage of in-service bolt detection and completely solve the in-service bolts detection problems.