Mannesmann Aktiengesellschaft

Krautkrämer Gmbh & Co.

Krautkraemer Gmbh

Hans-Jurgen Bathmann

Reinhard Prause

Ottokar Patzke

Bernhard Karbach

Harri Haacke

Gerd Kauth

Manfried Schoenen

Heinz Schneider

Gert Fischer

Siegmar Schulz

Bernhard Hoh

Ultrasonic test device

An ultrasound testing device for the non-destructive testing of a workpiece wherein at least three testing heads are disposed on a testing head carrier, and the testing heads emit sound waves which converge at one or more intersections in an area of the workpiece so as to detect defects and determine the wall thickness. Operationally, the number of intersections is one less than the number of testing heads, and the separation between the sound waves is chosen so as to avoid the disturbances associated with utilization of oppositely situated testing heads. In addition, the device uses a flow medium to couple the testing heads to the surface of the workpiece.

Ultrasound testing device for the non-destructive testing of workpieces

Plate stock of uneven and variable thickness is tested for defects by means of ultrasonics whereby the zone adjacent the front surface and up to a depth of the minimum plate thickness is detected conventionally, but under utilization of a novel method the zone of variable thickness adjacent the rear wall is tested by detecting any echo in a gating period (15) that is returned from that zone or from the rear wall, and such an echo is used to set up a supplemental gating period during which either none or the rear wall echo will occur and in the latter case the setting up of the supplemental gating period is interpreted as having resulted from the presence of a defect (for example, echo 12) so that the occurrence of the rear wall echo 9 within the supplemental gating period is registered as an indication of a defect.

Nondestructive testing of structural material by means of ultrasonics

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

Growing community of inventors

Moers, Germany

Hans-Jurgen Bathmann