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New Experience in the ultrasonic examination for stainless steel welds of heavy wall pressure vessel

Y. S PARK, N. G KWAG, K. C. SHIN HANJUNG - SOUTH KOREA
G. NARDONI, P. NARDONI I & T NARDONI INSTITUTE - ITALY
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1 Introduction

2 Interaction of ultrasound with the austenitic structure.

3 Probes

4 Scanning directions

Depth zone Probe Technique Scanning pattern
1 - 5 TRL CR Creeping waves
2 - 3 - 4 TRL-60°
F : 70
Angled compression
waves & RTT
TRL-60°
F : 40 or 35
Angled compression
waves
TRL-70°
F : 35
TRL-45°
F : 40
Fig 4: Example of scanning direction in the range of thickness 70 - 100 mm
Weld thickness range : 70 - 100 mm

5 Mode conversion at the boundary

6 Calibration Blocks

7 Sensitivity, DAC curves

Fig 6: DAC curve on CRS/monitor

8 Coincidence

9 Conclusion

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