Pulse-Echo Transit Time Technique
The pulse-echo transit time method is an ultrasonic testing technique that measures the transit time of the reflected sound signal to determine the depth position and wall thickness. It is used for flaw location and material inspection.
Physical-Chemical Mechanism of Action
The pulse-echo transit time method uses ultrasonic waves that are reflected from an object. The time it takes the signal to return to the sender (transit time) is measured. This transit time is proportional to the distance of the object.
Metallurgical Relevance & Welding Risks
This technique is especially important for testing weld quality and material integrity. Defects like cracks, pores, or deformations can be located precisely. Inaccurate measuring can lead to false diagnoses and let dangerous flaws go unnoticed.
Workshop Practice & Instructions
To correctly use the pulse-echo transit time method, the ultrasonic generator must have a high frequency (e.g., 5 MHz) to capture fine details. The transit time is measured in microseconds and multiplied by the sound velocity in the material to calculate the depth. For metals like steel, a frequency of 2-5 MHz is typical.