Mannesmann Aktiengesellschaft

Krautkrämer Gmbh & Co.

Michael Wachter

Alfred Graff

Kurt Hannoschock

Friedhelm Schlawne

Wolfgang Bottger

Peter Steinert

Wolfgang Zydek

Dieter Grohs

In a device for the arrangement of at least one ultrasonic testing head on a tube having a welding seam for the ultrasonic testing of the welding seam of the tube each ultrasonic testing head is built in a support. The support is provided with front and rear support points and led in constant radial distance to the tube on a test trace. The ultrasonic testing head is arranged in the area of the front support points, which are closest to the welding seam to be examined seen in the peripheral direction of the tube. A mechanical scanning device is provided, it is connected to the ultrasonic testing head and is arranged at the support in the area between the front and rear support points. The ultrasonic testing head has a single ultrasonic vibrator.

Testing head arrangement for correcting the angle of sound enhance using

An electrodynamic ultrasonic transducer, for testing a workpiece, has a pair of spaced permanent magnets, a transducer coil, a concentrator, and a non-ferromagnetic member which partially surrounds the concentrator. In order to concentrate the magnetic lines of flux, the concentrator has a cross-sectional area which is smaller than the cross-sectional area of the adjacent permanent magnets. A transducer coil is acted on by a high frequency transmission pulse, whereby ultrasonics is produced in the workpiece to be tested.

Electrodynamic ultrasonic transducer

The invention furnishes an electrodynamic transducer head for a non-destructive testing of workpieces with electrically conductive surfaces by way of ultrasound. A magnet system is employed for generating of a static or a low-frequency magnet field, and at least one transducer coil is disposed at the front face of the magnet system disposed toward the workpiece. The transducer coil is furnished on the side toward the workpiece with a wear-resistant layer, and the transducer coil exhibits between itself and this front face of the magnet system an intermediate part with an insulating layer, which is solidly connected with the front face and with the coil adjoining at the insulating layer. The invention discloses production of a transducer coil, in a way which is simple and economical and results in a transducer head which can be universally employed, and where the eddy current formations, resulting in interfering signals, and the mechanical vibrations, both in the transducer coil as well as in the magnet system, are substantially suppressed or, respectively, damped. The intermediate part (10) comprises at least two layers (11, 12), where one of the layers (12) is electrically conductive and which layer ( 12) is made of a material thickness which is larger than the skin depth for a given high-frequency field.

Electrodynamic transducer head

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Ratingen, Germany

Michael Wachter