Multisensor Inspection of Laser-Brazed Joints in the Automotive Industry

Abstract

Automobile laser brazing remains a complex process whose results are affected by several process variables that may result in nonacceptable welds. A multisensory customized inspection system is proposed, with two distinct non-destructive techniques: the potential drop method and eddy current testing. New probes were designed, simulated, produced, and experimentally validated in automobile’s laser-brazed weld beads with artificially introduced defects. The numerical simulations allowed the development of a new four-point probe configuration in a non-conventional orthogonal shape demonstrating a superior performance in both simulation and experimental validation. The dedicated inspection system allowed the detection of porosities, cracks, and lack of bonding defects, demonstrating the redundancy and complementarity these two techniques provide.

Embedded Sensors for Structural Health Monitoring: Methodologies and Applications Review

“…The latter is one of the most promising techniques for the development of SHM systems because it is very simple to implement and use low-cost, small, and lightweight PSs. It should be noted that PSs have a wide range of applications and can be implemented in metallic or composite structures [7,9,[35][36][37][38][39][40].…”

“…Damage changes materials conductivity affecting eddy currents and modifying the secondary magnetic field. These techniques can be used to measure electrical conductivities and magnetic permeabilities, detect defects, detect and analyse corrosion in the material, and measure coating thicknesses [6,7,20,21,46].…”

“…Currently, continuous and real-time SHM are assisted with the classical Non-Destructive Testing (NDT) techniques, such as ultrasounds [2], X-ray [3], infrared thermography [4], holographic interferometry [5], eddy currents [6,7], terahertz [8], among others, which require highly specialized labour along with expensive procedures. Furthermore, periodic inspections, that are the most traditional form of structural monitoring, are unable to provide any information on accidents and failures that occur between two successive revisions.…”

Design of Citrus Fruit Detection System Based on Mobile Platform and Edge Computer Device

“…The default input image resolution of the model is 608 pixel × 608 pixel × 3. Because there is only one category in the citrus dataset, the default feature dimension is 18.…”

“…With the update of hardware devices, many high-performance sensors are widely used [ 17 , 18 ]. In some specific scenarios, these low-power and portable devices may play an important role, to obtain crop information accurately and timely.…”