Indian Welding Journal

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Non Destructive Characterization Of Resistance Spot Welded Joints By Ultrasonic Technique


Affiliations
1 Welding Technology Center, Metallurgical Engg Dept, Jadavpur University, Kolkata - 700032, India
2 National Metallurgical Laboratory, Jamshedpur - 831007, India
     

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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.


Keywords

Ultrasonic Technique, Spot Weld, Grain Size, Dislocation Density, Attenuation.
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  • Non Destructive Characterization Of Resistance Spot Welded Joints By Ultrasonic Technique

Abstract Views: 281  |  PDF Views: 4

Authors

G. Chakraborty
Welding Technology Center, Metallurgical Engg Dept, Jadavpur University, Kolkata - 700032, India
T. K. Pal
Welding Technology Center, Metallurgical Engg Dept, Jadavpur University, Kolkata - 700032, India
S. Palit Sagar
National Metallurgical Laboratory, Jamshedpur - 831007, India
N. Parida
National Metallurgical Laboratory, Jamshedpur - 831007, India

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.


Keywords


Ultrasonic Technique, Spot Weld, Grain Size, Dislocation Density, Attenuation.