Transcript
OmniScan SX Getting Started Analysis Chris Magruder
V4.1B2T9
OmniScan SX Getting Started – Weld Inspection Analysis – Overview
The presentation is an abbreviated version of the OmniScan SX\MX2 training program designed to provide an overview of common features typically used in phased array corrosion mapping and weld inspection analysis. The file referenced in this section can be found on the default OmniScan SX flashcard: TF_12_ID Crack. More detailed explanations and data samples can be found in the complete analysis sections of the OmniScan SX\MX2 training program. The presentation can be followed using OmniPC on a computer or OmniScan SX using touch screen or mouse. ID connected HAZ crack in 12mm carbon steel
OmniScan SX Getting Started – Analysis – Open File TF_12_ID Crack.Opd
Open the TF_12_ID Crack.Opd data file by a touch and hold or mouse right click on the file name in the header and select open. Change >File Type: Data, browse to TF_12_ID Crack.Opd using the scroll knob and select open.
OmniScan SX Getting Started – Analysis – Select Layout
The file will open with the display in the normal screen mode as opposed to full screen. Select the A-C-S layout from the title bar if it is not already displayed. The next series of slide is to provide a brief overview of the inspection and to point out where the information resides in the software prior to analysis.
OmniScan SX Getting Started – Analysis – View Probe Details
Navigate to the >Probe\Wedge menu and view the following sub menus for parameters used in the inspection: 1. >Probe\Wedge = 5L64-A2 probe and SA2N55S dual 5L64 wedge, auto detect off. 2. >Probe position = Skew 90 at -10mm on the index axis. (Green ruler on S-scan) 3. >Part = 12.7mm V weld.
Skew 90 probe
Skew 270 probe -10mm
SA2N55S wedge
e n i l r e t n e c d l e W
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OmniScan SX Getting Started – Analysis – One Line Scan
The inspection technique is a one line scan parallel to the weld from a fixed position represented by the blue ruler on the C-scan and B-scan. The fixed position of the probe is called the index offset and defines the distance from the wedge face to the weld centerline represented by a green ruler. 0mm
-10mm
Probe movement
Scan axis
100mm
OmniScan SX Getting Started – Analysis – Scan Details
Navigate to the >Scan menu and view the following sub menus for parameters used in the inspection: 1. >Inspection = One line scan on encoder #1 at max scan speed of 50mm\sec. 2. >Encoder = Quad encoder in normal polarity with 16 step\mm resolution, and origin 0mm. 3. >Area = 0-100mm defines the length of the one line scan on the C-scan and B-scan (Blue ruler). All A-scans acquired at 1mm intervals. Length sizing accuracy = +\- 2mm.
1 2 3 0mm
100mm
OmniScan SX Getting Started – Analysis – Focal Law Details
Navigate to the >Focal law menu and view the following sub menus for parameters used in the inspection: 1. >Configuration = S-scan using probe associated to pulser and receiver element #1 of 64. 2. >Aperture = 16 element aperture using elements #48-63 of a 64 total element probe 3. >Beam = 45-70 degree S-scan at .5 degree resolution. (45, 45.5, 46, 46.5…….70)
1 2 70 degrees
45 degrees
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OmniScan SX Getting Started – Analysis – UT Settings
Navigate to the >UT menu and view the following sub menus for parameters used in the inspection: 1. 2. 3. 4.
>General = The range on the 55 degree A-scan is 2-15mm. Velocity is shear wave. (3240) >Pulser = 5Mhz probe, 80 volts selected, pulse width 100 ns, PRF 50 Hz. >Receiver = 5Mhz filter, FW rectified, video filter on. >55 degree beam = exit point -18.29mm (Index offset + beam offset inside wedge), wedge delay 31.34us, gain offset +4.8 dB. (Parameters change with each A-scan) 5. >Advanced = Reference on +10 dB scan sensitivity, 640 pt. A-scan.
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OmniScan SX Getting Started – Analysis – Full Screen Data Cursors
Select full screen from the layout menu in the title bar. Select the scan position on the title bar and move the data cursor in the C-scan to 0mm with the scroll knob or mouse wheel. The indication seen at 0mm in the root of the S-scan weld overlay is a geometric indication typical of the entire weld. Not a defect. Using the scroll knob slowly move the data cursor through the entire C-scan from 090mm while observing the S-scan and A-scan. Every 1mm represents a new S-scan where all A-scans were recorded. This reproduces the probe movement. An ID connected HAZ crack is detected between 31-62mm on the scan axis. Zoom from approx. 20-70mm on the Cscan.
Data cursor
31-62mm ID HAZ crack
OmniScan SX Getting Started – Analysis – Flaw Characterization Using the title bar, move the scan axis data cursor to 41mm and the angle data cursor to 51.5 degrees. Visualized in the S-scan and A-scan is the corner of the crack at the pipe ID. The amplitude is 59.1% (A% reading) and the depth is 12.10mm. (DA reading) ……………………………………………………………………………………………………… Move the scan axis data cursor to 50mm and the angle data cursor to 58.5 degrees. Visualized in the S-scan and A-scan is the deepest tip diffracted signal from the crack.
Crack corner trap at pipe ID. (51.5 degrees)
Diffracted signal from deepest crack tip. (59 degrees)
OmniScan SX Getting Started – Analysis – Flaw Analysis
Analysis of UT or phased array data is: 1. 2. 3. 4. 5. 6. 7. 8. 9.
Flaw amplitude: Flaw volumetric position: Flaw start position on scan axis: Flaw end position on scan axis: Flaw length: Flaw depth: Flaw height: Flaw characterization: Embedded\Outside surface connected:
OmniScan SX Getting Started – Analysis – Flaw Analysis cont.
TF_12_ID Crack.Opd analysis: 1. 2. 3. 4. 5. 6. 7. 8. 9.
Flaw amplitude: 59.1% measured at 41mm scan, 51.5 degrees. (A% reading) Flaw volumetric position: -4.15mm measured at 50mm, 58.5 degrees. (VIA reading) Flaw start position on scan axis: 31mm. (Sr cursor) Flaw end position on scan axis: 62mm. (Sm cursor) Flaw length: 31mm (Sm-r reading) Flaw depth: 7.80mm from OD measured at 50mm scan, 58.5 degrees. (DA reading) Flaw height: 4.9mm through wall dimension. (Um-r reading) Flaw characterization: ID connected HAZ crack. Embedded\Outside surface connected: ID connected.
OmniScan SX Getting Started – Analysis – Flaw Analysis cont.
All of the flaw parameters from the previous slide are directly available from the readings list except the flaw characterization type. (Crack, slag, porosity, etc.) The flaw characterization decision is based on many factors including experience and familiarity with the inspection and can be subjective. See flaw characterization section of complete OmniScan SX\MX2 training program. 2 1
OmniScan SX Getting Started – Analysis – Flaw Analysis cont.
Continue using this same methodology for another sample data file from the flash card. Review the parameters of the data file to understand how the inspection was performed and complete the same analysis steps as this presentation. For more details and examples see the analysis section of the complete OmniScan SX\MX2 training program.
Questions or comments:
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