NDTnet 1998 April, Vol.3 No.4

State of the art in ultrasonic testing of spot welds

This Application Note was first published in the Krautkramer Company Journal "Echo 36".
For further information, please contact Krautkramer.


Perfect spot weld: rapidly decreasing echo sequence, the echo distances correspond to the total thickness of the plates.

Weld nugget too small: alternate large and small echoes, echo distances correspond to the individual plate thicknesses.

Cold weld: long echo sequence, the echo distances are the same as a perfect weld

No weld: long echo sequence, the distances are the same as a nugget which is too small.
Nondestructive Testing of Spot Welds
Examination of a modified Ultrasonic Test System
Wilhelm Frohardt, Friedrich W. Meincke and Bodo Voigt, Bremen
(SD 272: QZ: Carl Hanser Verlag Munich 1990/1)

A Summary by R. Diederichs

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NDTnet 1998 April, Vol.3 No.4: NDTnet issue focus on NDT of Welding
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Copyright © Rolf Diederichs, rd@ndt.net 1. Apr 1998
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