|Nondestructive tests find defects that remain hidden to the naked eye, for
example, defective weld connections, cracks in the material, voids or inclusions.
Fraunhofer IZFP is currently preparing standardization of inductively excited
thermography, a novel nondestructive inspection method. This procedure is to
be configured as a replacement for magnetic particle testing.|
The industrial demand for manufacturing-accompanying nondestructive inspection by
standardized methods has grown steadily in recent years. Compared to established
standardized procedures novel approaches of nondestructive testing methods offer
tremendous progress and improvements such as shorter testing times, high
automation, reduced equipment and training costs, lower susceptibility to operating
error, among other things. Nevertheless, their comprehensive industrial spread is
hindered by a lack of standards and standardization. So often the user cannot provide
proof of test equipment aptitude of the procedure for the specific problem because of
high costs, lack of resources and/or lack of interdisciplinary methodological skills. In
particular, SMEs as suppliers are facing reasoning difficulties for warranting the use of
non-standard test methods or even expose themselves to a high degree of financial
risk. Thus, existing potential savings in time and expense while improving quality
cannot be exploited, whereby the position of German SMEs in the global economic
system is weakened.
Robotics-assisted thermography at a rail wheel
Copyright Uwe Bellhäuser
Inductively excited thermography is a not yet standardized but already widespread
alternative to traditional magnetic particle testing (MT). The test method is ideal for
fully automatic semifinished goods inspection of metallic parts and components. Unlike
MT, inductive thermography provides the evaluation of the defect depth. Moreover, in
most cases there is no need to remove surface coatings and the subsequent cleaning of
the surface is completely eliminated. To date, also in this case a comprehensive
acceptance is, however, obstructed by the lack of standardization.
In the near future, engineers of the Fraunhofer Institute for Nondestructive Testing IZFP
in Saarbrücken together with industry representatives will work out specific solutions
that will pave the way for standards and standardization of new inspection methods.
The general objective of this project is to strengthen the competitiveness in particular
of small and medium-sized enterprises. To this, amongst others a standardization
procedure for the inductive thermography is triggered, the conclusion will significantly
facilitate access to this inspection technology.
Represented by the Institute for Standardization e. V. (DIN) and the German Aerospace
Center (DLR) as executing agencies, the research project is funded since September
2014 to February 2016 by the Federal Ministry of Education and Research (BMBF) with
more than 100,000 euros.
For further information:
Dr. rer. nat. Udo Netzelmann | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP | Phone +49 681
9302-3873 | Campus E3.1 | 66123 Saarbrücken | www.izfp.fraunhofer.de |