Mannesmann Aktiengesellschaft

Mannesmannrohren-werke Ag

Dieter Kaiser

Karl Ries

Klaus-Uwe Jannsen

Dieter Lather

Kurt Hannoschock

Gunter Simoneit

Wolfgang Terschuren

Mesa Quaye

Heinz-Jurgen Boms

The test head includes its own calibration device in form of a wire or a bore in front of the transducing surface so that a distinguishable calibration echo is always available.

Test head for ultrasonic testing of structural material

The welding seam of a pipe is located by means of ultrasonic transducers and echo pulses responding particularly to rather minute distance differences on account of the convex contour of the seam and its elevation above the continued contour of the unmodified parts being welded together. A two or a three transducer configuration is used.

Locating a welding seam

Ultrasonic response signals resulting from interaction of a test pulse with the structural material are recognized by dynamically tracking the noise level and adding thereto a fixed level; a response signal to be recognized must exceed the resulting variable threshold level.

Recognizing ultrasonic response signals during testing of structural

The seam of a pipe is tested sequentially from various directions and with differently directed test beams to search for differently oriented defects, and repeatedly for stepwise testing each portion of the same.

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Mulheim, Germany

Dieter Kaiser