Buried Corrosion Detection in Multi-layer Airframe Structures
Substantial enhancements in Pulsed Eddy Current instrumentation and array probes provide a unique capability for the detection and imaging of sub-layer corrosion. The use of giant magnetoresistive (GMR) elements in an inductive array provides increased depth of sensitivity over conventional eddy-curr ent sensing coils. This paper provides an overview of newly developed instrumentation, whic h provides a portable, battery-operated platform for multi-layer corrosion dete ction in flight line or repair facilities. Demonstrated capability includes rapid inspec tion and detection of material loss in lap joints with air gaps and complex geometries. Advanced imaging capability and post-processing allows multi-layer analysis, with distinct C-scan images of up to four (4) 1-mm layers.
Studies of laser brazing with regard to the quality influencing parameters
Laser joining processes, such as brazing and welding, are a common application in industry,
especially in the automotive industry. These processes are the key to lightweight
and efficient design with regard to the automotive industry. There, laser brazing is used
mainly for visible joints due to the superior paint adhesion and surface roughness of
brazed joints compared to welds. As laser brazing is applied in the automotive industry
without using any fluxes or shielding gas, this leads to a difficulty in maintaining and
ensuring the quality of brazed joints.
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Evaluation and accuracy assessment of ANDSCAN - a non-destructive portable scanner, Part 1. ANDSCAN hardware and software.
In recent years, laboratory-based non-destructive testing (NDT) methods have advanced greatly, whilst many in-service techniques have remained tedious and operator-dependent with little or no permanent records except the hand-written notes of the operator. This can be attributed in part to the lack of a suitable portable scanner to perform the positioning functions of the laboratory scanning facility. ANDSCAN is a simple manual scanner providing positional information relating to any flat or curved surface, at any angle of inclination including vertical and upside-down. A comprehensive software package on a PC-compatible computer produces two-dimensional 16-colour scans of the signal from any NDT instrument with a real-time output, including ultrasonic, eddy-current and mechanical impedance flaw detectors. Post-processing facilities include flaw sizing, subtraction of scans to detect flaw growth, and rotating 3D images to assess the depth characteristics of defects.