Posco

Posco Co., Ltd

Sang-Woo Choi

Ju-Seung Lee

Ki-Jang Oh

Shin-Hwan Kang

Jong-Pil Yun

Ho-Moon Bae

Se-Ho Choi

Chang-Hyun Park

Geon Shin

Young-Do Park

Soo-Ho Jang

Won-Ho Hwang

Kee-Young Shin

Byeong-Soo Yoo

Kwan-Tae Kim

Nam-Ho Shin

Gi-Wan Son

Young-Hyun Kim

Kil-Bong Jang

Sang-Han Son

Hyung-Woo Kim

An apparatus for detecting inner defects of a steel plate comprises an all-defect detection unit for detecting all defects including surface defects present on the surface of the steel plate and inner defects present inside the steel plate by intensity of leakage flux, measured by generating magnetic flux in a strike direction of the steel plate; a surface defect detection unit for detecting surface defects by intensity of leakage flux, measured by generating magnetic flux in the thickness direction of the steel plate, for a predetermined detection region including all the defects detected by the all-defect detection unit; and a data processing unit for detecting only inner defects present in a detection region by excluding the detected surface defects from all the defects detected by the all-defect detection unit, for the detection region, thereby detecting only the inner defects of the steel plate.

Apparatus and method for detecting inner defects of steel plate

An aspect of the present disclosure may provide a defect detection apparatus and method for a steel plate, in which a defect in a steel plate may be detected, and particularly, only an inner defect in the steel plate may be detected, even with a relatively low amplification rate.

Apparatus and method of detecting defect of steel plate

Provided is a defect inspection device of a steel plate. The defect inspection device according to the present invention includes a plurality of inspection units arranged in a width direction of the steel plate, wherein each of the plurality of inspection units includes a first magnetized pole and a second magnetized pole corresponding to each other. Also, the inspection unit includes: a magnetizing part generating a magnetic flux for magnetizing the steel plate in a direction inclined at a predetermined angle with respect to a rolling direction through the first magnetized pole and the second magnetized pole; and a detection part detecting a leakage flux that leaks due to defects existing in or on the steel plate by using the flux generated by the magnetizing part. Thus, the defects may be correctly detected through the defect inspection device.

Defect inspection device of steel plate

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Pohang-si, South Korea

Sang-Woo Choi