An optimum block-schematic diagram and the distinctive features of a novel automated device that corresponds to modern requirements for the magnetic defectoscopy of the weld seams and heat-affected zones of electrically welded pipes that are 168–530 mm in diameter in the flow of their production are considered. It is shown that the application of computer technologies and thin-film transducers with high resolution allows one to substantially increase the functional possibilities of a defectoscope and provides the detection of not only defects of the type of metal discontinuities and edge displacements, but also defects that are caused by the violation of welding modes resulting in the burn and edge-cling defect types in the area of a weld seam.