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Study of Defect Sizing in Carbon Steel Butt Welds Using Conventional Ultrasonic Technique and Phased Array Ultrasonic

Phased array ultrasonic testing and conventional ultrasonic testing were used to measure defect sizes in carbon steel butt welds. Phased array employs focal laws and triggering of individual piezo elements to steer the beam, allowing full weld coverage with one scan. Conventional ultrasonic uses multiple angle probes and scans. Defect sizing using both techniques on three plates found no significant difference in measured length. Further study with more specimens is needed for statistical analysis.

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127 views1 page

Study of Defect Sizing in Carbon Steel Butt Welds Using Conventional Ultrasonic Technique and Phased Array Ultrasonic

Phased array ultrasonic testing and conventional ultrasonic testing were used to measure defect sizes in carbon steel butt welds. Phased array employs focal laws and triggering of individual piezo elements to steer the beam, allowing full weld coverage with one scan. Conventional ultrasonic uses multiple angle probes and scans. Defect sizing using both techniques on three plates found no significant difference in measured length. Further study with more specimens is needed for statistical analysis.

Uploaded by

Nicko Arya Dharma
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Study of Defect Sizing in Carbon Steel Butt

Welds using Conventional Ultrasonic Technique


and Phased Array Ultrasonic
Amry Amin Abas, Noorhazleena Azaman, Mohd Yusnisyam Mohd Yusoff
Leading Edge NDT Technology Group
Industrial Technology Division
Malaysian Nuclear Agency

Abstract

Ultrasonic testing is a proven reliable method which is able to detect and measure the size of defects in butt welds with acceptable tolerance.
Recent advancement of technology has introduced a computerized technique which is phased array. Phased array employs focal law that
enable focusing and steering of beam at the active aperture axis. This enables one line scanning but covering the whole weld volume as
compared to conventional technique which employs aster scan and multiple probes to completely cover the whole weld volume. Phased
array also gives multiple data view which assist the interpreter. This paper is about the study of these two techniques and technical analysis
of comparison between the two. The conventional technique is performed using GE USM GO with 4 MHz 45 degrees shear wave probe. The
phased array technique uses OLYMPUS OMNISCAN MX2 with 5L64 linear array probe with 16 elements aperture and 55 degrees wedge
emitting shear wave into the specimen. Sensitivity of both techniques are based on 1.5 mm Side Drilled Hole. The results are compared and
analysis such as defect sizing and defect type determination are performed.
Objective
1. To perform measurement of defect size in carbon steel butt welds using conventional UT technique
2. To perform measurement of defect size in carbon steel butt welds using phased array UT technique
3. To perform comparison of defect size between the two techniques

Phased Array Ultrasonic Testing Conventional Ultrasonic Testing

• Based on Huygen’s – Fresnel principle • Widely used in industry


• Triggering of each individual piezo elements shall • Single element
produce wavelets. • No beam steering capability and scan to be performed
• These wavelets will form a wavefront. using multiple angle probes
• The elements are triggered at certain delay • Takes longer time during inspection
• The direction of wavefront propagation depends on the • No permanent record
delay law applied.

Phased Array Ultrasonic defect Conventional Ultrasonic defect


size measurement size measurement
Specimen configuration
• Equipment : Olympus MX2 • Equipment : USM Go
Specimen Weld Plate thickness • Probe : 5L64-A12 • Probe : 45°, 60° and 70°
configuration
• Array type : Linear • Crystal layout : Single
Plate 1 Single v butt 12 mm
weld
• Pitch size : 0.6 mm • Probe size : 4 mm x 8 mm
Plate 2 Single v butt 15 mm • Active element : 16 • Sensitivity level : DAC at 80% FSH
weld • Active aperture : 10 mm • Sensitivity reference : 1.5 mm SDH
Plate 3 Double v butt 25 mm • TCG : 80% FSH • Type of scanning : Lateral and
weld • Sensitivity reference : 1.5 mm SDH horizontal
• Sectorial angle : 45° to 70° • Sizing method : 6dB drop
• Sizing method : 6dB drop
Specimen Type of defect Length Length PAUT
Conventional UT (mm)
(mm)
Lack of root
Plate 1 15 18
penetration
Slag Inclusion 22 28
Plate 2
Toe crack 14 8
Toe crack 14 17
Plate 3
Toe crack 16 18

No significant difference in defect length between


phased array ultrasonic and conventional ultrasonic.
However, further study with more number of Inspection using Phased Array Inspection using Conventional
specimens is needed to allow statistical analysis to be Ultrasonic Ultrasonic
performed

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