Methods of flaw detection in billets

Details Methods of flaw detection in billets Methods of flaw detection in billets

1982-10-28

1984-11-06

Yasich, Daniel M.

Thermal measuring and testing

Leak or flaw detection

With heating or cooling of specimen for test

374 57, G01N 2572

Patent

active

044809280

ABSTRACT:
Cracks and surface flaws in billets are detected by heating the surface of the work-piece by means of high frequency current, the heating taking place while the work-piece is brought to pass in its longitudinal direction through a high frequency induction coil. That part of the work-piece, which has just left the coil is immediately, while the work-piece is still passing through the coil, scanned by means of infrared recording equipment which records the temperature distribution across the work-piece. The emission coefficient for the different work-pieces is increased and differences equalized by moistening the surface of the work-piece with an appropriate liquid, for instance water, to which have been added components for reduction of the surface tension.

REFERENCES:
patent: 3020745 (1962-02-01), Sielicki
patent: 3378685 (1968-04-01), Green et al.
patent: 3945245 (1976-03-01), Stehle et al.
patent: 4109508 (1978-08-01), Fukuyama

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