DEFECT DETECTION OF RESISTENCE SPOT WELDS USED IN AUTOMOTIVE INDUSTRY BY NON-DESTRUCTIVE TESTING

1 FOREJTOVÁ Lucie
Co-authors:
2,2 ZAVADIL Tomáš 1 KOLAŘÍK Ladislav 1 KOLAŘÍKOVÁ Marie
Institutions:
1 CTU - Czech Technical University of Prague, Faculty of Mechanical Engineering, Technická 4, Prague, Czech Republic, EU, Lucie.Forejtova@fs.cvut.cz
2 ATG s.r.o., Toužimská 771, Prague, Czech Republic, EU, zavadilt@atg.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
688-693
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
25 views / 10 downloads
Abstract

Resistance spot welds (RSW) are one of the main joining technologies of thin plates in automotive industry. Key factors affecting the strength of the RSW joint are the nugget diameter, asymmetry, expulsions, intended surfaces, and presence of cracks. Despite its broad use, the weld quality verification is limited only to destructive testing and small number of NDT methods. Most of the testing is done destructively by sampling, which assesses only systematic defects. Ultrasonic Testing is the most used NDT method to detect nonsystematic defects in the RSW joints however the probability of defect detection (POD) of conventional testing technique is not fully satisfactory. Other approaches were invented to deal with this situation. The article compares the currently most used NDT approach with other options and discusses its usability and mutual interchangeability.

Keywords: automotive, resistance spot welding, thermography, ultrasonic testing, probability of detection
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