ROHMANN Eddy Current Test Equipment and Systems
Since 1977 we have been developing, producing and distributing eddy current testing devices and systems, which are now used worldwide in crack, heat treatment, material confusion and grinding burn testing. Testing solutions for every requirement and every demand. Made in Germany.
Rohmann GmbH is continuously developing the EloWheel testing system for the MRO sector. The rapidity of the inspection, the sensitivity of the defect search, the resolution and the reliability as well as the flexibility in the adaptation to different requirements are the key benefits of the inspection system.
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By using a dual probe, the EloWheel 800 makes it possible to inspect aircraft wheel rims for the detection of cracks on the surface and also defects inside the material at the same time.
Scope of the inspection: Inspection for the detection of surface cracks (HF inspection) – Inspected area up to end of the bead seat radius and Inspection for the detection of hidden defects (LF inspection) – Inspected area up to the beginning of the bead seat radius.
The large surface double test probe (HF/LF) with integrated compensation unit enables smooth gliding over the rim surface. Bead seat and the rim flange are automatically recognized and passed over with the aid of approach switches.
A user-friendly interface integrated in the ‚All in One‘ software ELO\WHEEL 3.0 is perfect for inspecting wheel rim quickly and safely for different types of defects
The industrial multitouch screen is mounted so that it can swivel, so that all parameters can be selected on it. It can also be used wearing gloves.
The selection and creation of new parameter sets is clearly displayed, so that rims can be selected safely and quickly. The status information of the system is always displayed.
The inspection is archived in a local database, including the information on the inspected rim and the inspection results. The inspection results can be loaded at any time via a search function.
All functions for automatic and manual operation of the system are integrated in the user interface of the EloWheel software. Important current status information of the system is displayed as colored icons.
Inspection logs can be directly printed out on a connected printer or stored as PDF files. Up to two customer logos can be embedded in the log layout.
Eddy current testing can be used to check objects made of electrically conductive materials for integrity, composition and tempering condition or also for geometric dimensions. Eddy current testing is based on the physics of electromagnetic fields.
A current-carrying electrical conductor is surrounded by a circular magnetic field (vortex field). If the straight conductor wire is now wound into a circular conductor loop, the vortex-like field lines overlap in such a way that they form a magnetic dipole (with a north/south pole structure).
In principle, eddy current testing can be classified as a surface testing method. Depending on the method, the induced eddy currents are concentrated on a more or less thin layer close to the surface. The strongest eddy currents flow directly at the surface. Therefore, the maximum test sensitivity can be achieved there.
The art of probes development consists in the realisation of a sensor construction that brings the required magnetic field (and thus the eddy current field) to the ‚test location‘ in the workpiece with the required test frequency, in the optimum alignment and required strength, while always minimising undesirable effects as far as possible.
Basically, there are two main groups of probes: flow sensors and tactile probes. In the case of through-flow probes, a distinction is made between: External pass-through sensor, which encloses the test object and is guided through it (e.g. rod testing with comprehensive test coils) and internal pass-through sensor, which is enclosed by the test object, i.e. the sensor is guided through the test object (e.g. in internal pipe testing). Pass-through sensors always detect a complete circumferential section of the test object, outside or inside.
When selecting the test frequency for eddy current testing, consider the specific requirements of the application and the sensor to be used. The recommended frequency range for the sensor should be taken from the manufacturer’s sensor data sheet.
Rohmann GmbH has continuously developed the ELO\WHEEL inspection system for the MRO sector.
