Slow-speed couplant that eliminates the effect of end surface roughness and improves the test effect of longitudinal and transverse waves

Abstract

A slow-speed couplant that eliminates the effect of end surface roughness and improves the test effect of longitudinal and shear waves. The coupling agent is made of cheap and easy-to-obtain materials such as gypsum, plaster of paris, polyvinyl alcohol, white latex, sodium hexaphosphate, calcium oxide and magnesium chloride according to a certain process, and is stored in a sealed bag for use. , mix with water when used, apply it on the surface of the object to be tested after fully stirring and install the ultrasonic probe, and then the ultrasonic test can be carried out. The couplant is in a flow-plastic state during the pretreatment stage of the ultrasonic test, which can fully fill the gap between the probe and the end face of the object to be measured, and eliminate the influence of the end face roughness on the ultrasonic test. It is in a hard plastic state during the ultrasonic test, and has an appropriate bonding strength to bond the ultrasonic probe and the object under test as a whole, so that better longitudinal and transverse wave test results can be obtained. At the same time, the present invention calculates the reaction quality of each material through the chemical reaction equation, makes the coupling agent close to neutral, and reduces the corrosion to the measured object and the probe.

Description

technical field [0001] The invention relates to the field of ultrasonic testing such as detection and flaw detection of rocks, concrete, and steel structures, and in particular to a slow-speed coupling agent that eliminates the influence of end surface roughness and improves the test effect of longitudinal and transverse waves. Background technique [0002] As one of the main exploration methods of geophysical exploration, ultrasonic detection technology is widely used in rock mass engineering property identification, integrity judgment, coal field and oil field exploration and other fields. At the same time, ultrasonic detection technology is also widely used in industrial and civil construction industries, such as non-destructive testing of concrete, steel structures and other materials. However, ultrasonic waves cannot penetrate the air between the ultrasonic probe and the measured object, so the transducer and the measured object must be protected by coupling. At presen...

AI Technical Summary

Problems solved by technology

Although these liquid couplants can pass through longitudinal waves, they cannot pass through shear waves; while solid couplants are poorly coupled under low stress conditions

In addition, the acoustic wave test has high requirements on the flatness of the end surface of the measured object, which cannot be widely applied to the test of different end surface roughness

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