ut presentation.ppt
TRANSCRIPT
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Ultrasonic Testing Method
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Ultrasonic Testing Method
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Types of mechanical waves
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Equipment
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Calibration
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Procedure
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Defect location
S (beam path length) is directly read out from calibrated CRT screen
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Defect sizing• 6 dB drop method
• 20 dB drop method
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Defect sizing contd…• Maximum amplitude method
Sensitivity setting
• DAC method
• DGS (AVG) Diagram method
Other
• AWS D1.1
• ABS etc…
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Determination of nature of a defectIn order to determine the nature of a defect by UT, consideration of the following facts is very important:
• Location and size of the defect
• A knowledge of the manufacturing process, service conditions and the history
• Level of practice of the operator
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Isolated pore, blow hole
Planar defects – cracks, lack of penetration, l.o.
fusion
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Slag inclusion
Porosity
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Thank you