With a good ultrasonic Non-Destructive Test (NDT) inspection system that determines the thickness and diameter of a spot weld, the results have been shown to be more accurate than a destruction test while the tests are much quicker, easier, less wasteful and more safe.
A 3-D Matrix Phased Array ultrasonic technology test system with a trained operator can finish the inspection of a set of spot welds in a fraction of the time without having to destroy a part and allow the results to affect changes to the weld systems to reduce production of bad welds.
Destructive testing of spot welds using calipers involve more human interaction and potential for inaccurate readings and/or recording of results by the user.