Determining the distance between antenna arrays and the speed of longitudinal waves in a test object when reconstructing the profile image of the bottom of a weld in ultrasonic testing

Resumo

A method is considered for determining the distance between two wedges and the speed of longitudinal ultrasonic waves in a test object when measuring the profile of the surface of pipelines under the bead of a weld. The method makes it possible to reduce the error in determining the profile of the bottom of a pipeline in the course of testing by refining the distance between the wedges and the speed of sound using head-wave pulses. Results of numerical experiments are provided for the processing of echo signals calculated by the finite-difference method in the time domain. The efficiency of the proposed technique is demonstrated with some model experiments.