Experimental analysis of ultrasonic testing applications using straight beam and angle beam probes

This study presents a thorough experimental comparison of the performance between standard ultrasonic probes and angled probes in ultrasonic testing applications. Additionally, it investigates the impressive potential of standard probes to generate wave propagation similar to that of angled probes when optimal geometric and acoustic configurations are utilized. Through carefully designed experiments, we analyzed the echo signals obtained from both types of probes, focusing on key factors such as signal amplitude, wave entry angle, defect detection capabilities, and measurement repeatability. Notably, during contact tests, we observed fluctuations in signal stability and challenges posed by the proximity of defects to the surface. These observations were closely related to the surface condition and the interaction between the probe and the sample. In contrast, tests conducted in water resulted in significantly more stable and repeatable outcomes. Our investigation demonstrated that when using a standard probe for angled scans in water, both longitudinal and transverse waves were effectively generated. To achieve optimal inspection with transverse waves, it was crucial to adjust the probe within a specific angle range. The findings of this study provide strong evidence that, under certain conditions, standard probes can serve as a viable and cost-effective alternative to angled probes. However, it is important to acknowledge that traditional angled probes continue to excel in applications requiring high sensitivity. This research advocates for a novel approach that harnesses standard probes in angled testing for non-destructive testing applications, thereby establishing a scientific foundation for alternative, economical solutions that could advance practices in the field.