6533b7d2fe1ef96bd125ebe0

RESEARCH PRODUCT

Defect characterization in Al welded joints by non-contact Lamb wave technique

Vincenzo NigrelliDonatella CernigliaM. Arone

subject

Materials scienceAcousticsMetals and AlloysWeldingInspection timeLaserIndustrial and Manufacturing EngineeringComputer Science ApplicationsCharacterization (materials science)law.inventionLamb wavesTransducerlawModeling and SimulationCeramics and CompositesUltrasonic sensorAir-coupled transducer lamb waves laser generation non-contact ultrasonic inspection welded joints.Electromagnetic acoustic transducer

description

Abstract The use of air-coupled sensors to detect flaws in Al welded joints and the advantage of Lamb wave for their characterization has been proved. Ultrasonic waves were generated by a pulsed laser and by contact angle-beam transducer, and received by an air-coupled capacitive transducer. Laser-based configuration was used to quickly locate the defect, whereas the angle-beam contact probe configuration to characterize it thanks to the dispersive behavior of Lamb waves. Guided waves allow inspection of the complete thickness with only one scan, permitting to detect and to size both internal and surface defects; their high flexibility in the measurement is due to the various parameters characterizing their behavior when compared to the bulk waves. Moreover, L-scan configuration can be used to inspect single-side access structures, and compared to the conventional A, B, C and P-scan allows to reduce inspection time, and therefore the related costs.

yearjournalcountryeditionlanguage
2006-06-01Journal of Materials Processing Technology
https://doi.org/10.1016/j.jmatprotec.2006.02.024