Recently, the need for the light weight vehicles that are capable of providing high performance at lower fuel consumption has become apparent. A number of new joining techniques that can overcome the difficulties encountered when the resistance spot welding is used to weld the aluminium sheet, the major material in the body structure of the light weight vehicle, are developed. Selfpiercing riveting (SPR), one of the new joining methods, offers a number of benefits and becomes the main joining method for the aluminium car. Self-piercing rivets are semi-tubular rivets that are punched into two or more substrates to form a mechanically fastened joint. Self-piercing rivets are to be used for the construction of the aluminium car body structures in much the same manner as resistance spotwelds are used. The paper presents a new method for non-destructive assessing quality of SPRs using ultrasound. A rivet is inspected by sending an ultrasonic continuous wave using a differential piezoelectric transducer operating at a predetermined frequency. The transducer is provided with a waveguide that is acoustically coupled to the rivet head. The rivet quality is evaluated by monitoring variations in the electrical transducer impedance represented by both the phase and the amplitude displayed in the complex impedance plane. The difference between the impedance corresponding to the inspected rivet and the predetermined scatter of values corresponding to sound rivets is monitored.
Assessing quality of self-piercing rivets using ultrasound
Qualitätsbewertung von Stanznieten mittels Ultraschall
2006
6 Seiten, 6 Bilder, 4 Quellen
Conference paper
Storage medium
English
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