Leakage-Flux Instruments

(Division TS)

The leakage-flux probe method is used for ferrous, hot-rolled surfaces with round
cross-sections.

On the CIRCOFLUX, the alternating field method is used for highly sensitive detection of longitudinal surface flaws, primarily on hot-rolled bar stock.

On the ROTOMAT/TRANSOMAT, the DC field method is used for detection of external and internal flaws on hot-rolled tubes. Either longitudinal flaws or transverse flaws are detected, depending on the magnetisation direction. API and ISO standards describe the method.

Magnetic Leakage Flux (NDT) Instruments

	CIRCOFLUX DS The CIRCOFLUX DS is particularly suitable for detecting longitudinally oriented surface flaws on hot-rolled, round bar steel owing to its very special high-energy alternating-field leakage-flux principle. A flaw resolution upwards of 0.1 mm flaw depth is conventional. The newly introduced instrument system, based on Windows technology, allows convenient operation and uncompromising network connectivity. Modern touch screen technology and application wizards simplify dialogue and reliably prompt the operator to ensure correct instrument settings. The system uses the networking capability and multitasking power and performance of Windows operating system. Thus, FOERSTER allows access to the test instrument from any number of computer stations simultaneously, even if interests differ, such as current test status, test result of the last job tested or a lot tested last month for reasons relating to investigations. 3 rotating heads are available for the diameter range 10 - 180 mm. Special solutions with stationary test heads and rotating material are implemented for larger dimensions
CIRCOFLUX testing line at the Aichi Steel Works. One of the largest bar manufacturers in Japan

	ROTOMAT / TRANSOMAT The DC field leakage-flux method is suitable for detection of flaws on the inside and outside surface for testing hot-rolled, seamless steel tube in the diameter range 20 - 310 mm. Either the ROTOMAT or the TRANSOMAT is used, depending on the flaw orientation (longitudinal or transverse). Generally, both systems are combined, in some cases supplemented by wall thickness measurement and a material mix test in so-called multi-test units. The primary field of application is testing oil field pipes according to the American Petrol Industry standards API 5L and 5CT and, in some cases, also boiler pipes. The application is described in ISO 9598 resp. ISO 9402.
To specify the quality characteristics of hotrolled, seamless steel tubes, Mannesmann S.A. Brazil, have been using since 1996 a highly modern multi-test block.