Does Bead Roughness Interfere with Ultrasonic Testing of Welds of Limited Thickness?

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Abstract

Traditional ultrasonic testing of weld quality using the echo method often faces the problem of detecting signals from defects against the background of interference from weld irregularities. The article provides an example of how design features that usually interfere with flaw detection of welds can be used to suppress such interference and develop a highly productive and reliable ultrasonic testing technology. In this case, we are talking about ultrasonic testing welded joints of small-diameter pipes. The features of solving this problem using a chord sounding scheme are described, a brief historical background of this solution and examples of implementation in testing welded joints are given, including for inhomogeneous materials.

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About the authors

L. Yu. Mogilner

Bauman Moscow State Technical University

Author for correspondence.
Email: mogilner@mail.ru
Russian Federation, Bldg. 1, 5, 2nd Baumanskaya St., Moscow, 105005

References

  1. USSR Patent No. SU491094. Method of Ultrasonic Testing. Aleshin N.P., Isaaс Yu. Mogilner, Raikhman A.Z., Kudryashov Yu.M., Volkov A.S., Klimkin G.P. Published 1975.11.05. Bulletin No. 41 // Discoveries. Inventions. 1975. No. 12. P. 62.
  2. Aleshin N.P., Mogilner Isaaс Yu. Determination of optimal tilt angles of piezoelectric plates of prismatic separate-combined detectors for testing welded pipe joints // Defectoskopiya. 1977. No. 3. P. 58—64.
  3. Vopilkin A.Kh., Mogilner L.Yu. Memories of Academician Nikolai Aleshin / Welding and Diagnostics: Russian Scientific and Technical Conference named after Academician of the Russian Academy of Sciences N.P. Aleshin. Moscow. November 11–13, 2024): abstracts. Moscow: Bauman Moscow State Technical University, 2024. P. 224—228.
  4. Russian Code RD 34.17.302-97 Steam and Hot Water Boilers. Steam and Hot Water Pipelines. Vessels. Welded Joints. Quality Control. Ultrasonic Testing. Basic Provisions (OP 501 CD-97). Moscow: NPP Norma, 1997. 138 p.
  5. Ushakov V.M., Mikhalev V.V., Davydov D.M. On the sensitivity of a flaw detector during ultrasonic testing with chord probes // Defectoskopiya. 2008. No. 11. P. 41—46.
  6. Kuchuk-Yatsenko S.I., Radko V.P., Kazymov B.I., Zyakhor I.V., Nikolnikov A.V. Detectability of defects during ultrasonic testing of pipe joints made by contact butt welding // Automatic welding. 2007. No. 1 (645). P. 39—43.
  7. Giller G.A., Mogilner L.Yu. Ultrasonic testing of welded pipe joints. New technologies and equipment // Defectoskopiya. 2000. No. 1. P. 83—87.
  8. Chernov V.S. Welded joints of thin-walled pipes inspection: X-ray or ultrasound // In the world of non-destructive testing. 2002. No. 2 (16). P. 32—34.

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2. Fig. 1. Chordal scheme of weld sounding: extract from the copyright certificate No. SU491094 (a); design scheme (b): 1 - transmitter; 2 - transmitter prism; 3 - weld seam; 4 - product (pipe); 5 - receiver prism; 6 - receiver; 7, 8 - upper and lower rolls of the weld seam.

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3. Fig. 2. Chord transducer for inspection of steel pipe joints ∅ 40 × 4 mm. Museum specimen.

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4. Fig. 3. Chord transducer from the first batches of the 1970s. In the red strobe the signal from the reflector ∅ 1 mm, in the green strobe - from the sample end.

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5. Fig. 4. Chord transducers for inspection of steel pipe welds: inspection performance (a); defects (b) detected in the weld of pipes ∅ 26 × 3 mm; 1, 2 - joints of carbon and austenitic steel pipes; 3 - signal from the defect; 4 - signal from weld irregularities behind the strobe pulse; 5, 6 - pores and non-welding in the weld section.

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