Mannesmann Aktiengesellschaft

Nukem Limited

V&m Deutschland Gmbh

Salzgitter Mannesmann Line Pipe Gmbh

Mannesmann Line Pipe Gmbh

Gert Fischer

Alfred Graff

Dieter Lather

Heinz Schneider

Stefan Nitsche

Michael Kaack

Hans-Jurgen Bathmann

Jorg Quittkat

Hans-Jurgen Rohde

Ashraf Koka

Karl-Heinz Breckel

Jochen Berkemeier

Raimund Lang

Sven Gwildies

The invention relates to an ultrasonic probe for the non-destructive testing of metal work pieces, particularly pipes, for transverse defects, comprising a row-shaped arrangement of oscillator elements located on a lead wedge for coupling to the work piece. According to the invention, the lead wedge is designed as a wedge-shaped hollow body, which is filled with fluid and the wedge angle of which is a maximum of 24, and which is arranged on the work piece such that the intromission angle into the work piece is a maximum of 70.

Ultrasonic probe

A device for nondestructive testing of a pipe made of ferromagnetic steel for detection of longitudinal, transverse or inclined flaws using magnetic or magnetic-induction test procedures is disclosed. The device includes a magnetizing yoke which transmits the magnetic flux contactless into the pipe and at least two magnetic-field-sensitive scanning probes having GMR sensors. The GMR sensors are combined into sensor groups in form of a sensor array and electrically connected in parallel. A single preamplifier connected to each sensor group in one-to-one correspondence. The device further includes an evaluation unit.

Device for nondestructive testing of pipes

An electrodynamic ultrasonic transducer includes a housing to be placed against a workpiece surface to be tested. A magnet system is arranged in the housing in the vicinity of the workpiece surface to be tested. A transducer coil system is arranged between the magnet system and the workpiece surface. The housing is of a non-magnetic, electrically conducting material, and the housing wall has, in a region receiving the magnet system, segment-like recesses. Circuit closing plates are removably mounted in the recesses for ensuring a magnetic flux between the workpiece surface and the magnet system.

Modifiable electrodynamic ultrasonic transducer

The invention relates to a test head mounting for single or multiple test heads in ultrasonic testing in immersion technique process. To reduce expenditure in the replacement of the test heads, a capacitive coupling is proposed between the test head and mounting element for the test head.

Test head mounting for single or multiple test heads

Sheet or plate stock is used as to defects by a row of ultrasonic transmitting transducers on one side and receiving transducers on the other. The transmitting transducers receive frequency-modulated signals via individual buffers, and the receiving transducers feed individual, digital amplitude envelope minima to detection circuits whose outputs are fed to a computer which also feeds operating parameters to the source for the modulated signals. Different types (autonomy) of the receiver channels are described as well as diagnostic and setup procedures.

Ultrasonic testing of sheet and plate stock

A transducer for launching ultrasonic test signals is stimulated by an electrical signal which is of trapezoidal contour. Particularly the trailing edge of the signal is to decline at a rate similar at least as to order of magnitude to the rise time, and occurring in synchronism with a natural zero crossing of the vibration of the transducer to fully develop at least one full ultrasonic oscillation.

Stimulating electro-acoustical transducers

Growing community of inventors

Wachtendonk, Germany

Gert Fischer