10.14489/td.2021.07.pp.050-054

2021, 07 July

DOI: 10.14489/td.2021.07.pp.050-054

Ushakov V. М., Mikhalev V. V., Sheinov V. M.
FEATURES OF INSPECTION OF RING WELDED CONNECTIONS OF PIPE ELEMENTS BY CHARGING TYPE CONVERTERS
(pp. 50-54)

Abstract. The article presents the results of an experimental study of the features of ultrasonic testing when adjusting the sensitivity with chord-type transducers. The unevenness of the control sensitivity in the direction perpendicular to the welded joint of the pipe element is shown. At a distance of 4…5 mm from the center of the weld, the reduction is 12…15 dB. In order to ensure reliable detection of discontinuities, it is proposed to scan perpendicular to the welded joint with the simultaneous movement of the chordal probe along the seam. The scanning parameters have been calculated. A corresponding instruction for ultrasonic testing of circular butt welded joints of pipe elements has been developed. The instruction describes the testing process with scanning of welded joints by chord type probes. Sensitivity adjustment is provided at a flat-bottomed reflector. A probe is placed on the border of the nearseam zone of the welded and moved perpendicular to the seam to the rear distance from the seam, shifted along the seam, taking into account the step to the seam to a position close to the seam, the probe is again shifted by a compression step, etc. Instruction is intended for ultrasonic testing of circular butt welded joints of 32´4 pipe elements; 42´4.5; 36´6; 60´6 and 108´6 mm.

Keywords: welded joint, ultrasonic testing, angled piezoelectric transducer of chord type, reference sample, flat-bottom reflector, echo pulse.

+ - About the Authors Click to collapse

V. М. Ushakov, V. V. Mikhalev, V. M. Sheinov (JSC “RPA “Cniitmash”, Moscow, Russia) E-mail: VMUshakov@cniitmash.сom, VMUshakov@cniitmash.сom, VMUshakov@cniitmash.сom

+ - References Click to collapse

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