Pulse-echo technique
The pulse-echo method is an ultrasonic test that sends short sound pulses and measures their reflections. It allows precise localization of flaws in the material.
Physical-Chemical Mechanism of Action
The pulse-echo method uses ultrasonic waves sent through a probe into the material under test. These waves hit changes in material or flaws and are reflected. The probe receives these reflections and measures the time difference between emission and reception.
Metallurgical Relevance & Risks in Welding
This method is especially important for controlling weld quality as it accurately identifies flaws such as cracks, pores, or incomplete fusion. Misinterpretation of results can lead to incorrect conclusions and hide potential safety risks.
Workshop Practice & Action Instructions
To successfully use the pulse-echo method, the probe must be correctly aligned. The sound waves must be directed perpendicular to the surface under test. The time difference between emission and reception is measured in microseconds and compared to a reference value to locate flaws.