Resistance spot welding is extensively used to join sheet steel in the automotive industry. Ultrasonic non-destructive
techniques for evaluation of the mechanical properties of resistance spot welding are presented. The aim of this
study is to develop the capability of the ultrasonic techniques as an efficient tool in the assessment of the welding
characterization. Previous researches have indicated that the measurements of ultrasonic attenuation are sensitive to
grain- size variations in an extensive range of metallic alloys. Other researchers have frequently described grain
sizes which are able to have significant effects on the physical characteristics of the material. This research provides
a novel method to estimate the tension-shear strengths of the resistance spot welding directly from the ultrasonic
attenuation measurements. The effects of spot welding parameters on the ultrasonic waves are further investigated.
The results confirm that it is possible to determine the spot welding parameters for individual quality by using
ultrasonic test.
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