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In modern industrial manufacturing, eddy current testing technology has become an important tool for ensuring the surface quality of forged steel rolls. Eddy current roll surface detection is based on...
In the case of steel objects being tested, even if they contain multiple alloy components, their sound velocity is considered to be basically constant. However, in many other materials, such as many non-ferrous metals or plastics, the variation of ultrasonic propagation velocity is significant, which affects the accuracy of the measurement by the ultrasonic testing instrument.
If the material of the object being tested is not isotropic, the sound velocity will differ in different directions. Under such circumstances, the average sound velocity within the testing range must be used for calculation. The average value is obtained by measuring the reference block whose sound velocity is equivalent to that of the tested block.
The sound velocity of the material varies with the temperature. If the calibration of the instrument is performed in a relatively low-temperature environment, while the instrument is used in a relatively high-temperature environment, the testing result will deviate from the true value.
To avoid the influence of temperature, the method is to preheat the reference block before instrument calibration to achieve the same temperature as the use environment, or to multiply the measurement results by a temperature influence factor.
The surface roughness of the tested part affects the testing. The rougher the surface is, the greater the impact is. The rough surface can cause systematic error and random error. The number of measurements in different positions should be increased each time to overcome random error.
The adhesion must be applied before testing to ensure direct contact between the instrument probe and the surface of the tested part.
The strong magnetic field produced by various electrical equipment around will seriously interfere with the testing work.
BKN has formed a social research cooperation network with domestic famous universities and research institutes, and has powerful research and production capabilities. This guarantees BKN's leading industrial non-destructive testing technology and world-class technical status. BKN adheres to the concept of specialization, refinement, and strength, and focuses on online and offline automatic testing of stainless steel pipes. It has achieved remarkable results in this field and has become a leader in the industry.
The eddy current sorting machine is the company's flagship product, which is suitable for rapid sorting of bearing cracks, mixing, hardness deviation, and burns. The entire system consists of four parts: testing equipment, testing probe, electrical and mechanical part. It achieves automatic defect detection, automatic sorting, and automatic alarm. Welcome to inquire.
