How does the ultrasonic thickness gauge test the thickness of a large area of steel plate?
Steel products are divided into four categories: profiles, plates, pipes and metal products. Steel plates are one of the four major types of steel products and are flat steel products with a large aspect ratio and surface area. Usually made of multiple layers of steel compressed together, it is more wear and corrosion resistant than normal steel and can be used to strengthen foundations and support units of mass such as bridges, providing the basis for building larger materials and parts.
Why do steel plates need to be tested for thickness?
The thickness plays a very important role in determining the hardness, tensile strength, toughness, etc. of the steel plate, and its hardness and tensile strength properties decrease with the increase of the plate thickness. Due to this feature, the thickness and dimension of the steel plate need to be detected with high precision to ensure the quality during use. However, ordinary large-area steel plates cannot be measured by ordinary calipers or micrometers, so ultrasonic thickness gauges are needed for measurement.
Ultrasonic thickness gauges measure thickness based on the principle of ultrasonic pulse reflection. Take the Linshang LS212 ultrasonic thickness gauge as an example, the probe in contact with the material emits ultrasonic pulses, the pulses pass through the object to be measured and reach the material interface and are reflected and then received by another sensor of the probe. The instrument determines the thickness of the material being tested by precisely measuring the time that ultrasonic waves travel through the material.
The specific test steps are as follows:
Lay the steel plate in a place suitable for testing, remove dust, dirt, scale, rust, paint and other coverings on the test surface of the steel plate, and sand the rough surface to reveal the metallic luster
Check whether the surface of the probe is clean or if there is any wear and tear, so as not to affect the measurement accuracy. If the probe is severely worn, it should be replaced in time.
In the "Sound Velocity Setting" option, select "Known Material Set Sound Velocity", and then check the appropriate steel plate material, the instrument will match the corresponding sound velocity according to the selected material
Apply enough couplant on the surface of the test area, press the probe vertically on the test position and keep it still to ensure good coupling between the steel plate and the probe until the thickness of the steel plate is obtained by the instrument.
If you need to test at multiple points to check the uniformity of the steel plate thickness, you can select the QC mode on the “System Settings” interface to set the qualified interval value of the steel plate thickness, so that when testing, the instrument will automatically judge the value for the user according to the test results. Whether the thickness of the steel plate in the block area is qualified can improve the detection efficiency.
Linshang LS212 Ultrasonic Thickness Gauge can be widely used in the thickness detection of steel plates. It has the advantages of accurate measurement, high precision, good practicability, safety and reliability, no radiation and other manual measurement and other measurement methods, which improves production efficiency and Improve product quality and reduce labor intensity.
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