日本金属学会誌

J. Japan Inst. Metals, Vol. 76, No. 9 (2012),
pp. 555-562

Ultrasonic Method for Testing Spot-Welds

Hajime Takada1, Takahumi Ozeki1, Rinsei Ikeda1 and Tomoyuki Hirose2

1Steel Research Laboratory, JFE Steel Corporation, Kawasaki 210-0855
2West Japan Works, JFE Steel Corporation, Fukuyama 721-8510

Abstract:

We developed a technique for nondestructively evaluating spot-welds based on through-transmission of Lamb waves. The nugget diameter can be evaluated by measuring the width of the zone where attenuated transmitted waves are observed. A particularly important feature of the developed technique is that spot-welds with no weld metal can be reliably distinguished from spot-welds with weld metal. We also developed a measuring system using array transducers. The measurement results using the system agree well with the nugget diameters measured by cross-sectional observation.


(Received 2012/1/30)

Keywords:

spot welds, nondestructive testing, ultrasound, probe array, nugget diameter


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