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

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