Non-destructive quality-testing of a joint between sheets made b

Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test

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364469, 374 57, G01N 2572

Patent

active

046207996

ABSTRACT:
A method is described for the non-destructive testing of a joint obtained by the electrical spot-welding of two sheets of substantially the same material joined together in a local zone with the formation of a weld core which has a thermal diffusivity substantially different from the thermal diffusivity of the material of the two sheets before welding, such a core being obtained only when the welding is of a good quality.
The testing is effected by a device the main characteristic of which is an electrode which delivers heat and a detector electrode located at two conveniently chosen points on one surface or opposite surfaces of the two welded sheets. The detector electrode is connected through an amplifier and an analog-digital converter to a computer which processes the signal to provide an indication of the weld quality on the basis of the measured value of the thermal diffusivity.

REFERENCES:
patent: 2264968 (1941-12-01), De Forest
patent: 2323715 (1943-07-01), Kuehni
patent: 2852850 (1958-09-01), Martin
patent: 4362057 (1982-12-01), Gottlieb et al.

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