Testing Systems for Ultrasonic Inspection of the Stressed State of Metal Structures and a Microcrack Locator Using Nonlinear Acoustic Effects

Results of field tests of ultrasonic checking systems for the stress-strained state of pipelines on a hydrostand are considered. Biaxial mechanical stresses induced by a combined load, i.e., internal pressure and bending, are determined. Results of testing a microcrack locator that uses nonlinear acoustic effects are presented.