In ultrasonic testing, high-frequency sound waves are transmitted through a test material to detect imperfections within the material and can locate changes in material properties. The most common techniques introduce an ultrasonic wave into the test material and reflections (echoes) are returned to a receiver from internal imperfections or from the part’s geometric surfaces. By using longitudinal waves (a straight beam), ultrasonic testing can be used to inspect pins, bolts and shafts for cracking. It can also be used to inspect pipes and plates for laminations and to determine thickness. By using a shear wave (an angled beam) ultrasonic testing can be used to inspect pipe and plate weldments and can be used to inspect cracks for depth, size, length, and orientation.
TPT utilizes both longitudinal and shear wave ultrasonic testing techniques to evaluate parts and products that are submitted to our laboratory for evaluation or they are utilized in the field to conduct on-site inspections. One tool that TPT utilizes to conduct ultrasonic inspections is a C-Mapps unit, which detects internal corrosion. This instrument can be used on plates or pipes. Thickness readings may be recorded to within 0.001 inch. NDT Level I, NDT Level II, or NDT Level III certified technicians can perform ultrasonic inspections.