Experimental and Localisation Method for Non-Destructive Testing of Cable Corrosion Based on Weak Magnetic Imaging

Area of Science:

• Engineering
• Materials Science
• Non-Destructive Testing

Background:

• Accurate identification of corrosion extent in parallel steel wire cables is crucial for structural integrity.
• Existing methods may lack precision in quantifying corrosion severity.

Purpose of the Study:

• To develop and validate a novel weak magnetic imaging method for precise corrosion detection in parallel steel wire cables.
• To establish quantitative relationships between magnetic signal characteristics and corrosion parameters.

Main Methods:

• Collected weak magnetic signals using a 12-channel Hall array from corroded parallel wire bundles.
• Analyzed the influence of corrosion severity on magnetic leakage signal distributions (Bx, Bz).
• Developed a fusion imaging method combining adaptive threshold K and linear interpolation, validated with 3D finite element modeling.

Main Results:

• A strong linear relationship (R² = 0.998) was found between axial corrosion length and the peak-to-trough distance of the Bz component.
• A positive correlation was observed between circumferential corrosion width and the circumferential distribution range of Bz.
• Adaptive threshold K segmentation effectively delineated corrosion boundaries for precise localization.

Conclusions:

• The proposed weak magnetic imaging method enables accurate visualization and quantitative assessment of cable corrosion.
• The technique provides reliable technical support for structural health monitoring of steel wire cables.
• This method enhances the precision of non-destructive testing for corrosion in critical infrastructure.