Non Destructive Characterization Of Resistance Spot Welded Joints By Ultrasonic Technique
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Authors
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Welding Technology Center, Metallurgical Engg Dept, Jadavpur University, Kolkata - 700032 ,IN
G. Chakraborty -
Welding Technology Center, Metallurgical Engg Dept, Jadavpur University, Kolkata - 700032 ,INT. K. Pal
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National Metallurgical Laboratory, Jamshedpur - 831007 ,INS. Palit Sagar
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National Metallurgical Laboratory, Jamshedpur - 831007 ,INN. Parida
Keywords:
Ultrasonic Technique, Spot Weld, Grain Size, Dislocation Density, Attenuation.Abstract
Spot weld quality in terms of soundness of joint and nugget penetrations have been evaluated by ultrasonic technique. Furthermore, the variations in ultrasonic attenuation characteristics caused by grain boundary scattering have been utilized to assess grain coarsening at weld metal due to spot welding heat. The interpretations of ultrasonic signals are found to correspond with the results obtained from peel off and shear tensile test and are at par with the optical and TEM observations.
