Phased array ultrasonic testing presentation

© - Copyright Bureau Veritas
PHASED ARRAY ULTRASONIC TESTING
22/07/2024

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Bureau Veritas Presentation _ 23-02-2023
CONVENTIONAL UT Vs PHASED ARRAY
With a conventional probe
to change the sound angle
we must change to a
different probe or wedge.
With a phased array
system the sound
angle can be changed
electronically

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To focus we must use a
lens or curved element.
To change the focus we
must change the probe.
The focal point can also
be changed electronically

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To scan the volume
of a part we must
physically move
the probe.
Physically movement of
the probe not required
to cover entire thickness

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Phased arrays Concept
• A mosaic of transducer elements in which the timing of the elements' excitation
can be individually controlled to produce certain desired effects, such as
steering the beam axis or focusing the beam.
 Phased array technology is the ability to modify electronically the acoustic probe
characteristics
 Probe modifications are performed by introducing time shifts to individual
elements of an array probe

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Phased Array Scanning Types
Linear Electronic Scan
► The movement of the acoustic beam
is along the axis of the array,
without any mechanical movement.
► The beam movement is performed
by time multiplexing of the active
elements. Arrays are multiplexed
using the same focal law.

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Phased Array Scanning Types
Sectorial Scan
► The ability to scan a complete sector
of volume without any probe
movement.
► Useful for inspection of complex
geometries, or geometries with
space restrictions.
► Combines the advantages of a wide
beam and/or multiple focused
probes in a single phased array
probe.

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Weld coverage
► Weld inspection
 PA probe in order to cover complete weld
volume.
 1 PA probe on each side of the weld

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Data Display
Traditional A-Scan (depth & amplitude)
S-Scan (Section view) Volumetric location, depth, height
C-Scan (Top view) Length, location, width
B-Scan (End view) Length, location, depth

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Defect Detection
Index axis
Scan axis
VC-TOP(C)
VIEW
Index axis
Scan axis
Top View

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Defect Detection
Index axis
Scan axis
VC-TOP(C)
VIEW
Index axis
Scan axis
Top View

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Defect Detection

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Defect Detection
CRACK
Radiography
Phased Array technique

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Defect Detection
LACK OF ROOT
PENETRATION
Radiography

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Defect Detection
SIDE WALL LACK
OF FUSION
Radiography

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Defect Detection
SLAG INCLUSIONS
Radiography

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Defect Detection
POROSITY Radiography

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Selection Of Scanners
Depends on the following job parameters
 Job type (Pipe / Vessel/plate)
 Job Conditions (Diameter & thickness of the pipe, accessibility)
 Scanning requirement (Semi automated / Manual)

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Advantages of Phased Arrays
•Detection: Capable to detect the defects with random orientations using a
single probe.
•Characterization: Easier and precise defect characterization and sizing.
•Speed: scanning with phased arrays is much faster than single-probe
conventional mechanical systems, at the same time offering better
coverage.
•Recording: Inspected data is encoded and stored digitally for future use.
Conventional UT Probe PhasedArray Probe

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Site Requirements
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•© - Copyright Bureau
► Client shall provide Job details (WPS, OD & Thickness details)
► Longitudinal or spiral welds must be ground flush a minimum of 250 mm on the
outside and a minimum of 100 mm on the ID side on each side of the weld from
circumferential weld (exact length to be defined).
► Neither coatings nor weld splatters are to be present up to (min) 250 mm on
either side of circumferential & longitudinal welds for the scanning area.
► Circumferential clearance between pipes shall be around 300 mm.
► Temperatures within 55 to 60 degree Celsius are acceptable.
► Clean, debris free fresh water for Inspection as couplant
► Facility to store our equipment and power to keep battery charging

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