A method and device for non-destructive testing of a joint such as a weld seam of a component to material defects, such as cracks by means of induction - thermography

摘要

The invention relates to a method for non-destructive testing of a joint such as a weld seam of a component (8) on material defects, such as cracks by means of induction - thermography, in which the component (8) in a test zone (10) of the component (8) with an inductor (1), the same direction and at the wound coils with a ferromagnetic coil core (5), used is excited and the by inductive excitation of the component (8) induced temperature profile in the testing zone (10) of the component (8) with a within (11) and by means of a detected with the within (11), which is coupled to the computer (19) is evaluated.between the ferromagnetic coil cores (5) in the same direction of the wound coils of the inductor (1) a viewing window for a thermographic camera (11) opening (6) which is formed which, on the excitation surface (9) of the component (8) in the testing zone (10) of the latter is oriented,in the excitation surface (9) of the component (8) of the inductor (1) a thermal pulse is introduced, the one transverse heat flow in the excitation surface (9) are generated and the test area (10) of the component (8) heated homogeneously, andat the same time the thermographic camera (11) on the side of the excitation surface (9) of the component (8) and positioned to the forming of the viewing window opening (6) of the inductor (1) and aligned in this case, an unobstructed view of the within (11) through the opening (6) of the inductor (1) to the homogeneously heated test area (10) of the component (8) is prepared according to the german patent application 10 2012 008 531.1, wherein the viewing window of the inductor (1) is scaled and the reflected temperature profile at least of a crack (13) in the component (8), which in the partially homogeneously heated test area (10) of the component (8) by the viewing window of the scaled inductor (1) is used to determine without hindrance, of the within (11) as a line (14) featuring peg end faces (15) is reproduced scaled by illustration, the the regions in the test area (10) of the component (8) at the crack ends, whereupon the length of the used detected crack (13) in the component (8) by the distance of the point-like end faces (15) of the line (14) is determined in the thermographic reproduction.