Method for longitudinal, transverse and oblique error testing of work pieces by means of ultrasound, according to the impulse-echo method

摘要

The method for ultrasonic testing of work pieces to detect longitudinal, transverse and oblique errors therein uses a test head support having at least one test head. The test head support is moved in a translatory direction along a surface of the work piece. Ultrasonic impulses are generated in a rapid sequence by the test head, progress along a sound beam, and are directed to impact the surface of the work piece in test areas. All test areas of the at least one test head lie in a linear test path. In the case of uninterrupted, translatory movement, all test areas meet in one and the same test area. The sound beams progress in a given constant angle in relation to one set perpendicular line on each test area. The sound beams rotate, in a conical envelope, around the respective perpendicular line. A complete rotation of 360. degree. takes place in time t.sub.r which is shorter than time t.sub.t which is required by the translatory movement in order to cross a distance with the dimensions of a test area, per revolution generates and sounds at least ten ultrasound impulses into the surface of the work piece.