Study on phased array ultrasonic synthetic focusing technique for hollow axle testing

Menglin, Zhao; NDT research center, Southwest Jiaotong University; China

Zhang, Y.; Southwest Jiaotong University; China
Gao, X.; Southwest Jiaotong University; China
Zhao, M.; Southwest Jiaotong University; China
Peng, J.; Southwest Jiaotong University; China

ID: ECNDT-0192-2018
Download: PDF
Session: Transportation, railway & automotive UT 2
Room: R2
Date: 2018-06-13
Time: 11:30 - 11:50

Automatic ultrasonic testing is widely used to inspect the hollow axle of high-speed train. Multi-channel probes with fixed angle beam can be used for manual detection and automatic detection. In this paper, the synthetic focusing method of phased array probes based on different beam control laws is studied. The transverse cracks and volume defects in hollow axle are detected by using virtual source and full matrix acquisition (FMC) technique respectively. Experimental results show that this method can effectively improve the signal-to-noise ratio of defect image and characterization of fatigue cracks. Real image of defect in hollow axle can be achieved by separating transverse and longitudinal wave from reflected waves and optimizing propagation path algorithm. The experimental results clearly present the size of the internal defects and the shape and growth trend of the transverse cracks on external surface of the hollow axle.