Method of flaw detection in billets

Details Method of flaw detection in billets Method of flaw detection in billets

G - Physics

08

B

340/124.6

G08B 21/00 (2006.01) G01N 25/72 (2006.01)

Patent

CA 1186770

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 coeffisient 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.

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