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.
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.
Sabine Poitevin-Burbes | Fraunhofer-Institut
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