How to use ultrasonic thickness gauge to identify the correct method of material
An instrument that measures the thickness of an object using the principle of ultrasonic waves, usually in situations where access is not possible with tools. It has a maximum accuracy of 0.01 mm and a *mass range of 300 mm. It is used by placing an ultrasonic transducer on the surface of an object and moving it at a constant speed to calculate the thickness of the object using the ultrasonic principle, e.g., the hull of a ship, a pipe, a component plant or a machine. Generally ultrasonic thickness gauges can be used to measure homogeneous materials, such as metal, glass, hard plastics and so on. However, non-homogeneous materials such as concrete, asphalt or wood cannot be measured.
For surface corrosion, coupling effect is very poor in-service equipment, pipelines, etc. can be sanded, ground, thwarted and other methods of surface treatment, reduce the roughness, but also oxides and paint layer can be removed, revealing the metal luster, so that the probe and the object being examined through the coupling agent can achieve a very good coupling effect.
When there are defects within the material (such as inclusions, interlayers, etc.), the display value of about 70% of the nominal thickness, this time the ultrasonic flaw detector can be used for further defect detection. Before the ultrasonic thickness gauge measures the workpiece, the speed of sound is preset according to the type of material or back-measured according to the standard block. When a material calibration instrument with a material (commonly used test block for steel) and go to measure another material, will produce erroneous results. It is required that the material must be correctly identified and the appropriate speed of sound selected before measurement.
