Ultrasonic Testing Flashcards
What principle does ultrasonic testing work on?
Velocity * density of material
What is the biggest advantage of ultrasonic testing?
It can detect most defects giving accurate location and size of the defect
What frequencies are most ultrasonic inspections done at?
0.1-25 MHz
Reflected sound can also be called __________.
an echo
One defect that can only be detected by ultrasonic testing is ____________.
Lack of fusion
What are some criteria that needs to be met for ultrasonic testing?
1) Clear definition of test parameters
2) Proper examiner certification
3) Adequate calibration and standards
4) Practical test specifications
5) Detailed test records
A higher frequency during a test will result in a ____________ sensitivity.
Higher
What are the 2 ways a sound wave will propagate through a material?
1) Compression wave: longitudinal with atoms moving parallel to wave direction
2) Shear wave: transverse with atoms moving at a right angle to the waves
What is required to transmit mechanical energy wave from a probe to the part being inspected?
A couplant
What are the 2 major ultrasonic testing applications in Alberta?
1) Flaw detection: welds, rotors, and airframe components
2) Thickness measurements: corrosion, maintenance, ship construction, and armor plating
What are the 2 functions of a piezoelectric transducer?
1) Convert mechanical energy to electrical energy
2) Convert electrical energy to mechanical energy
Cathode ray tube or digital display plots __________ on the y-axis and _________ on the x-axis.
Amplitude, time
What are the advantages of ultrasonic testing?
1) Can be used on any solid material
2) Detects planer defects
3) Very accurate and sensitive
4) Can be easily automated
What are the disadvantages of ultrasonic testing?
1) Requires a lot of training
2) Difficult to interpret results
3) Parts that are irregular in shape are hard to inspect
4) Couplant is required
What are the 3 most common UT frequencies?
1) 2.25 MHz
2) 5 MHz
3) 10 MHz
