Abstract: The corrugated steel web structure is an important steel structural component of a new type of long-span bridge. Its application range and prospects are more and more wide. So far, the quality inspection of the new structure has not obtained an efficient and reliable method. For the requirement of the T-weld of corrugated steel webs, this research is based on the exploration of ultrasonic transverse wave technology. It is mainly to optimize the parameters of ultrasonic probes, and to detect the incidence of probe wedges by ultrasonic transverse wave flaw detection. The accuracy of the detection results of the angle and the detection frequency was studied experimentally. Through experimental exploration and data analysis, it is concluded that in the detection of similar T-shaped structure welds, the probe should be used detection frequency of 2.5 MHz and a K-value of 2, and the detection rate is optimal. The optimal probe parameters obtained this time lay the foundation for the development of the later probe.