Device for the ultrasonic inspection of the weld seam of longitudinally welded pipes for defects

The Invention relates to an apparatus for ultrasonic testing of Weld longitudinally welded pipes for longitudinal defects with one on the surface of the pipe relative at least one side adjacent to the weld displaced test unit, consisting of a least one surface in contact with the pipe probe receiving with vibrator transducer with a coupling agent feed whose Channel opens in the area of ​​the resonator, wherein the probe in a fixed predetermined position to Rohroberfläch e locatable.The test unit (5) is provided with two, depending on the testing and tube geometry, each in their distance variable Probes (3, 3 '), in particular angle probes, in tandem equipped, wherein a probe (3, 3 ') as a transmitter and the other inspection head (3, 3') acts as a receiver and the position of the inspection heads (3, 3 ') relative to the pipe surface in such a manner in the test unit (5) adaptable that this independent the pipe diameter always in the intended angle of incidence relative to the pipe surface are corresponding position can be arranged.