ut presentation.ppt
Post on 12-Jan-2016
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Ultrasonic Testing Method
Ultrasonic Testing Method
Types of mechanical waves
Equipment
Calibration
Procedure
Defect location
S (beam path length) is directly read out from calibrated CRT screen
Defect sizing• 6 dB drop method
• 20 dB drop method
Defect sizing contd…• Maximum amplitude method
Sensitivity setting
• DAC method
• DGS (AVG) Diagram method
Other
• AWS D1.1
• ABS etc…
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
Isolated pore, blow hole
Planar defects – cracks, lack of penetration, l.o.
fusion
Slag inclusion
Porosity
Thank you
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