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4-UT Calibration

This document discusses NDT calibration procedures. It describes standard calibration blocks used to verify equipment characteristics and set testing parameters like range and sensitivity. The document outlines how to perform calibrations using normal and angle probes on these blocks to establish reliable testing results. Proper coupling medium selection for different surface conditions is also reviewed.

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MOHAMMAD ALI
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79 views17 pages

4-UT Calibration

This document discusses NDT calibration procedures. It describes standard calibration blocks used to verify equipment characteristics and set testing parameters like range and sensitivity. The document outlines how to perform calibrations using normal and angle probes on these blocks to establish reliable testing results. Proper coupling medium selection for different surface conditions is also reviewed.

Uploaded by

MOHAMMAD ALI
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
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CALIBRATION

CALIBRATION THE
THE
TESTING
TESTING SYSTEM
SYSTEM

Mohamad Pauzi Ismail


Introduction
• Purpose of Calibration
• Standard Blocks
• Calibration with Normal Probe
• Calibration with Angle Probe
• Construction of DAC curve
• DGS diagram
• Coupling medium
Purpose of Calibration
• To produce reliable and reproducible
test results
Standard Test Blocks
• To perform
– Equipment characteristic verification
– Range/Time base calibration
– Reference level or sensitivity setting
• Calibration block?
• Reference block?
IIW-V1 block
IIW V2 block
ASME block
IOW block
Other blocks
• ASTM blocks
• Area amplitude block
• Distance amplitude block
EQUIPMENT
CHARACTERISTIC
• Horizontal linearity
• Screen height linearity
• Amplitude control linearity
• Resolution
• Maximum penetrating power
• Pulse length
CALIBRATION-Normal
probe
• Determine test range
• Min. TR at least = block thickness
• Calibration echoes – 1st and 2nd BWE

probe

w
flaw

w beam path distance


CALIBRATION-Angle
probe
• Use 100mm curvature of V1 or
25mm/50mm curvature of V2 block
• Range – min. 100mm for V1
• Range – 100mm/125mm for V2
Beam profile
• Use IOW or ASME block
CALIBRATION
• Probe index

• Probe angle
SENSITIVITY
SETTING
• Backwall echo method
• DAC
• DGS
COUPLING
• Water, glycerine, oils, petroleum
grease, silicon grease, wall paper
paste, etc.
• Water with wetting agent suitable
for smooth surface
• Grease/heavy oil for hot, vertical or
rough surface
Probe selection
• Normal probe – twin crystal for
t<30mm
• Angle probe
BS 3923 JIS Z 3060

6 ~ 15mm : 80o 6 ~ 40mm : 70o


15 ~ 35mm : 70o 40 ~ 60mm : 70o or 60o
35 ~ 60mm : 60o and 450 > 60mm : 70o and 45o
or 60o and 45o

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