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Main flaw detection method of steel plate

TF Sources Co.,Limited | Updated: Sep 19, 2018
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1. Ultrasonic flaw Detection (UT)

Ultrasonic flaw detection in the plate before the transmission of ultrasound, if there are defects in the plate, then the ultrasonic wave will be due to the defect reflection, refraction or deformation waveform, by recording these changes to analyze the types of defects and their morphology.

Ultrasonic is often used to detect inclusions, shrinkage holes, bubbles, cracks and other defects in the steel plate because of its high energy, good penetrating performance and smooth steel plate itself.

2, Magnetic particle inspection (MT)

Magnetic particle flaw detection is only suitable for detecting surface defects, which means to determine the position, size and morphology of defects by laying magnetic powder on the surface of the equipment and using its aggregate shape on the surface defects of magnetic materials equipment. The method is of low cost and easy to use for batch plate in steel production enterprises.

But for the depth of the special profile, whether the method to detect hidden deeper defects, to be verified on the ground.

3. Penetration Testing (PT) Penetration detection technology is also only suitable for detecting surface defects.

It uses osmotic fluid applied to the surface of the steel plate, and then use the cleaning solution to wipe the surface of the excess liquid, and then apply the imaging agent, the defect residue of the osmotic fluid is image material adsorption, so as to observe the shape of defects and determine the type of defects.

This method needs to be wiped several times before and after the test, the process is more cumbersome, and can not detect internal defects and surface roughness and dirty steel plate.

4. X-ray detection (RT) X-ray or gamma-ray projection on the surface of the steel plate, the other side of the plate can be placed on the rubber, because the radiation through the plate transmission, absorption due to defects and strength, so the film can record the shape and location of defects.


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