Online magnetic flux leakage detection of inclusions and inhomogeneities in cold rolled steel plate
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Jakob Schwarzmann
Jakob Schwarzmann, born in 1991, began his Physics study at the Ruhr-Universität Bochum in 2010 and completed his MSc Thesis on the generation of ultrasound by spark discharges. He is working as a development engineer at IMS Messsysteme GmbH since 2015. Current activities include magnetic systems for defect and geometrical inspection of ferrous strip products.
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Tim Beiküfner
Tim Beiküfner, born in 1992, studied Electrical Engineering at the Westfälische Hochschule Gelsenkirchen, Germany and Applied Computer Science at the Ruhr West University Bottrop, Germany. He is working at XAPT/IMS Röntgensysteme GmbH as an electronics developer focusing on programmable logic devices, especially in optical and magnetic inspection systems, since 2014.
Abstract
Cold rolled steel plate is found in different applications. In manufacturing processes with high stretch ratios like bending or deep drawing, non-metallic inclusions, or segregations, which remain in the material during slab casting, can lead to ruptures of the plate. While not being visible optically, those inclusions are detectable by magnetic flux leakage inspection. Therefore, an online inspection system using giant magnetoresistance gradiometers was developed. The individual components were optimized by researching the magnetic properties of the cold rolled plate and natural as well as artificial defects on a laboratory setup for moving material simulation. Correlations between defect properties, inspection parameters and the resulting signals were determined. By optimizing components and configuration accordingly, a sensor module containing 48 sensors, signal conditioning, digitization, and an adjustable magnet was arrived at. Due to the necessarily small distance to the moving material, attention was paid to mechanical repeatability and ruggedness. An inclusion detection system, fully covering 1344 mm strip width, was installed in a coating line. Operating in production for over a year, the inspection system has shown high sensitivity and is, in addition to internal defects, able to detect various strip damages like roll marks and scratches.
About the authors
Jakob Schwarzmann, born in 1991, began his Physics study at the Ruhr-Universität Bochum in 2010 and completed his MSc Thesis on the generation of ultrasound by spark discharges. He is working as a development engineer at IMS Messsysteme GmbH since 2015. Current activities include magnetic systems for defect and geometrical inspection of ferrous strip products.
Tim Beiküfner, born in 1992, studied Electrical Engineering at the Westfälische Hochschule Gelsenkirchen, Germany and Applied Computer Science at the Ruhr West University Bottrop, Germany. He is working at XAPT/IMS Röntgensysteme GmbH as an electronics developer focusing on programmable logic devices, especially in optical and magnetic inspection systems, since 2014.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- In situ corrosion fatigue life of 2198-T8 Al–Li alloy based on tests and DIC technique
- Characterisation of a wire arc additive manufactured 308L stainless steel cylindrical component
- Mechanical properties of a 7075-T6 aluminum alloy at elevated temperatures
- Low-velocity single and repeated impact behavior of 3D printed honeycomb cellular panels
- Fracture mechanical evaluation of the material HCT590X
- Effects of forging on the mechanical properties of B4Cp/Al composite with flaked Al and Al2O3 particles
- Homogenization effect on precipitation kinetics and mechanical properties of an extruded AA7050 alloy
- Low velocity impact response of sandwich composites with hybrid glass/natural fiber face-sheet and PET foam core
- Earing prediction of 2090-T3 aluminum-cups using a complete homogenous fourth-order polynomial yield function
- Imitation of human muscle by using an electromechanical system
- Reptile search algorithm and kriging surrogate model for structural design optimization with natural frequency constraints
- Online magnetic flux leakage detection of inclusions and inhomogeneities in cold rolled steel plate
- Characterization of hydrogen assisted corrosion cracking of a high strength aluminum alloy
- Influence of illuminance on indication detectability during visual testing
- Quality optimization of FDM-printed (fused deposition modeling) components based on differential scanning calorimetry
