Phased Array Ultrasonic Technology (PAUT) Contribution to ...
The Influence of PAUT Parameters on Crack Location, Pattern and ...
Transcript of The Influence of PAUT Parameters on Crack Location, Pattern and ...
JUNE 2010
CIORAU-PAUT PARAMETERS 1
3RD INT CANDU IN-SERVICE-INSPECTION & NDT IN CANADA 2010 CONFERENCE
The Influence of PAUT Parameters on
Crack Location, Pattern and Height Sizing
Peter Ciorau – Ontario Power Generation
Inspection, Maintenance & Commercial
Services Division - Pickering – Canada
E-MAIL : [email protected]
JUNE 2010
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OUTLINES:
1. PROBLEM STATEMENT
2. EXPERIMENTAL PROGRAM
3. WEDGE AND PROBE PARAMETERS
4. MACHINE + FOCAL LAW PARAMETERS
5. CONCLUSIONS
6. ACKNOWLEDGEMENTS
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1. PROBLEM STATEMENT
• DEFECT PARAMETERS (LOCATION, LENGTH, HEIGHT,
PATTERN (NATURE) MAY BE INFLUENCED BY:
- PROBE (DEAD ELEMENTS, PITCH SIZE, ACTIVE
APERTURE)
- WEDGE (ANGLE, VELOCITY, H1)
- TESTPIECE VELOCITY
- MACHINE (FILTERS, FREQUENCY)
- FOCAL LAW CALCULATOR (FOCAL DEPTH,
ACTIVE APERTURE, ANGULAR RESOLUTION)
• TOLERANCES MUST BE SET BASED ON APPLICATION
(WHAT IS CRITICAL FOR FINAL REPORTING)
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1. PROBLEM STATEMENT
• PAUT IS NOT DIFFERENT FROM CONVENTIONAL UT
• ERRORS MUST BE QUANTIFIED
• THERE ARE LIMITS AND “TRICKS” IN PAUT
• ONE MUST EXPECT THE ACCURACY IN SIZING, LOCATION
AND DISPLAY (PATTERN) MAY BE AFFECTED BY SYSTEMATIC,
RANDOM AND HUMAN ERRORS
• CAN PAUT COMPETE WITH TOFD (+/- 0.3 MM) ?
• CAN PAUT PERFORMANCE BE IMPROVED BY ACCESS AND
SPECIAL SET-UPS?
• CAN WE AFFORD CUMULATIVE INDEPENDENT ERRORS?
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2. EXPERIMENTAL PROGRAM
TEST # BLOCK ID PROBE ID FEATURES
1OHR 20
# 18
TW : P66-45T
(PLEXIGLASS)CRACK HEIGHT (D), LOCATION
2 AB 259TW : P9-30REX
(REXOLITE)
CRACK HEIGHT (D) LOCATION,
PATTERN
3 AB 163B LW : 78, 80, 84CRACK HEIGHT (S)
LOCATION, ANGLE
4L-1 ST.
AS BUILTLW : P21, P25
CRACK LENGTH (D)
LOCATION, ANGLE
5OHR 20
ACUREN-SCCTW : P74-45T CRACK HEIGHT, PATTERN
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2. EXPERIMENTAL PROGRAM
• EVALUATE INDIVIDUAL TOLERANCES TO GET:
- ± 1 mm crack height accuracy
- ± 1 mm crack ID location
- ± 2 mm for index (projected distance)
- ± 2 for sizing / detection angle
• ESTIMATE TOLERANCES FOR COMBINATION OF FACTORS
• SET REALISTIC TOLERANCES FOR DIFFRACTED INSPECTIONS
(SIDE TECHNIQUE ON L-1 STEEPLE)
• EVALUATE THE S-SCAN DISPLAY FOR WEDGE, PROBE AND
TESTPIECE VARIABLES (VELOCITY, ANGLE, HEIGHT, PITCH)
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2. EXPERIMENTAL PROGRAM
WHY SUCH TOLERANCES ?
- TURBINE INSPECTION (LITTLE MARGIN OF ERRORS; COMPARISON WITH MP
AND FM )
- SCC PATTERN – A MUST (HIGH RESOLUTION)
4.2 mm
15.8 mm
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2. EXPERIMENTAL PROGRAM
WHY SUCH TOLERANCES ?
- TURBINE INSPECTION (LITTLE MARGIN OF ERRORS)
- SCC PATTERN – A MUST (HIGH RESOLUTION)
HIGH
RELIABILITY
PAUT
RESULTS VS
MP AND FM
STEEPLE / BLADE
GEOMETRY
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3. WEDGE AND PROBE PARAMETERS
TEST #1
LOCATION
PLEXIGLASSHEIGHT
WEDGE VELOCITY
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3. WEDGE AND PROBE PARAMETERS
REXOLITE WEDGE VELOCITYTEST #2
2450 m/s2250 m/s
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3. WEDGE AND PROBE PARAMETERSWEDGE ANGLETEST #2
28 DEG30 DEG
ACTUAL33 DEG
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3. WEDGE AND PROBE PARAMETERSHEIGHT OF THE 1ST ELEMENT
1.5 mm 3.5 mm
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3. WEDGE AND PROBE PARAMETERSCAN WE ACCEPT THESE TOLERANCE – COMBINED?
TEST #2
H1 = 3.5 MM; 2300 M/S; 32 DEGREES H1 = 1.5 MM; 2400 M/S; 28 DEGREES
NOT ACCEPTED !
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3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #1
Tolerance: +/- 50 microns
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3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #2, 3
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3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #3
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3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #4
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3. WEDGE AND PROBE PARAMETERSPROBE PITCHTEST #4
P 25 – 0.8 MM
P 25 – 0.6 MM
P 25 – 0.4 MM
ACTUAL
TOLERANCE: + / - 150 MICRONS
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4. MACHINE + FOCAL LAW PARAMETERS
VIDEO DISPLAY
SMOOTHING ON SMOOTHING OFF
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4. MACHINE + FOCAL LAW PARAMETERS
ANGULAR
RESOLUTION
10 A-SCANS
COURTESY OLYMPUSNDT-USA
ELECTRONIC
/LINEAR SCANNING
0.5 DEG 1 DEG 4 DEG
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4. MACHINE + FOCAL LAW PARAMETERS
FILTERS AND FOCAL DEPTH
TEST #5
F = 7 MM; 10 MHZ
F = 4 MM; HR 10 MHZ
F = 2 MM; HR 10 MHZ
F = 1 MM; HR 10 MHZ
SCC DEPTH,
PATTERN
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4A. TESTPIECE VELOCITY PARAMETERS
3050 M/S3200 M/S 3350 M/S
TOLERANCE:
+/- 100 M/S
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5. CONCLUSIONS
• TOLERANCES MUST BE SET FOR SPECIFIC APPLICATIONS
• INDIVIDUAL TOLERANCES ARE LARGER THAN THE COMBINED
ONES
• 1ST HEIGHT : NO EFFECT ON CRACK HEIGHT AND PATTERN;
EFFECT ON LOCATION; +/- 1 MM ACCEPTABLE
• WEDGE VELOCITY: + / - 60-80 M/S ACCEPTABLE
• WEDGE ANGLE: + / - 1 DEGREE ACCEPATABLE
• PROBE PITCH: + / - 60 MICRONS ACCEPTABLE
• TESTPIECE VELOCITY: + / - 80 M/S ACCEPTABLE
• OTHER PARAMETERS, SUCH AS FILTERS, FOCAL DEPTH AND
ANGULAR RESOLUTION MUST BE SET BASED ON APPLICATION;
BETTER TO COVER 0.2-1.2 T; < 0.5 DEGREES; RECOMMENDED HR
FILTERS
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6.0 ACKNOWLEDGEMENTS
1. The author thanks to the Management of IM&CS
Division - OPG for granting the presentation and
publication of the present paper to the 3-rd CANDU
ISI & NDT in Canada-2010 Conference.
2. Special thanks to Chris Chartier - Acuren Oakville
for welded pipe sample with SCC.
3. Thanks to OlympusNDT – Waltham – USA for
allowing to use 2 figures from PA book.
QUESTIONS ?THANK YOU !