On October 1-4, 2023 OKOndt GROUP attended Railway Interchange 2023 - the largest North American railway event. This time the exhibition took place in Indianapolis, Indiana, USA (Indiana Convention Center) and brought together over 700 exhibitors and more than 8, 000 visitors who are the major influencers in the industry. Thank you to everyone who was with us at the RI 2023!

UD3-71 Flaw Detector for Ultrasonic Testing of Rails and Welds purpose

The UD3-71 ultrasonic flaw detector is designed for the testing of welded rail joints with a set of manual probes and USR-01 scanner (Tandem Rig):

Intended for re-testing of various type rails laid down in a track and also is used to carry out the before welding testing of end sections of new and used rails and welded joints.


  • High brightness color TFT display.
  • Internal memory (Micro SD card 8 Gb) for saving the testing setups and testing results.
  • Special Test Rig for Tandem Testing Technique.
  • Direct digital display of depth and distance of flaws.
  • Compact and light weight (0.9 Kg).


Test Range

1- 6000 mm


1000 – 15000 m/s in steps 1, 10,100,1000 m/s

Angle probe

0 – 90 0


0 – 9999 mm depending on the set PRF value


0-100 dB in steps 0.1, 0.5, 1, 10


0 – 80 % FSH


Full wave, positive half wave, negative half wave, RF

Receiver bandwidth

0.4-20 MHz (- 3 dB)

Digital Frequency

0.4, 1, 1.25, 2, 2.5, 3, 4, 5, 6, 7, 8, 10, 15 MHz

Test Modes

Pulse echo and transmit/receive.



Measurement Gates

  • 2 fully independent three-level gates for amplitude and TOFD measurement.
  • Special gate of Automatic gain control (AGC)

Result display

A-scan, B-scan, simultaneous of up to 5 measured parameters selected by the user.


  • Number of points is 32.
  • Building TCG curve by DAC


  • automatic building of curve for different equivalent diameters
  • calibration at calibration blocks and testing objects.
  • building DGS curve by DAC.

Internal memory

Micro SD card 8 Gb is used for saving the testing setups and testing results

Tandem Technique

Special Test-Rig for tandem technique is provided for the Rail weld joint examination.


Complete set of probes are provided for the Rail weld examination.

Display dimension (WxH, diagonal)

70 mm x 50 mm


0.8 kg

Overall dimensions (HxWxL)

188x107x78 mm

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