Principles of the angle beam pulse echo weld inspection The below example represents a planar butt weld and the typical setup required to perform the inspection through the scanning from one side and the corresponding ISONIC screenshot: ISONIC instrument generates the background images of the Scanning Plan Top View Side View End View related to the inspected volume - the images are stipulated by the dimensions of the said volume and by the number of the suitable parameters such as Scan Index, Skip Distance, Probe Angle, etc. An operator clamps the probe (search unit) into the probe holder, which is a hand held implement for manipulation The operator grips probe holder, applies probe to the object under test and manipulates it over the scanning area ISONIC instrument transmits the ultrasonic pulses toward the volume under test and detects signals reflected there from via the probe and measures the received signals There are two emitters of airborne ultrasound equipping the probe holder. There are two receivers of airborne ultrasound placed on the object under test; said receivers detect the emitters' pulses. ISONIC instrument determines the probe coordinates and swiveling angle through the detected travel time of airborne ultrasound Vibrator emits low frequency noise into the object under test for pick up by the probe. ISONIC instrument determines the coupling degree through the measuring level of the received low frequency noise ISONIC instrument creates image of the actually observed probe trace through the correlating between the current degree of acoustic coupling, probe coordinates and swiveling angle. Image of the actually observed probe trace represents the testing integrity On the said testing integrity image ISONIC instrument continuously generates the perceptible marks corresponding to the current coupling degree and probe location and swiveling angle ISONIC instrument generates and records the projection images of the defects in 3 planes through the correlating between the signals received from the volume under test, probe coordinates and swiveling angle and coupling degree ISONIC instrument provides the recording, storing and off-line representing, postprocessing and documentation for all the above data