Common defects of magnetic steel powder

Seamless steel tube magnetic particle detection or penetration detection can effectively detect surface cracks, folding, heavy skin, hair lines, pinholes and other surface defects. For ferromagnetic materials, magnetic particle detection method should be preferred, because of its high detection sensitivity; for non-ferromagnetic materials, such as stainless steel seamless pipe, then the penetration detection method.
Seamless steel pipe when the two ends reserved cut margin less, due to the structure of the detection device, the two ends are sometimes not effective detection, and the end is the most likely crack or other defects in the site. If there is a potential tendency to crack in the end, the potential for crack propagation is also likely to be affected by the welding heat effect during installation. Therefore, it should also pay attention to a certain area of seamless steel pipe after welding detection, timely detection of defects in the expansion of steel pipe head.

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