การทดสอบโดยไม่ทำลาย (Non-Destructive Testing)

1 1 Non- destructive TestingSuranareeUniversity of TechnologyDepartment of Mechanical Engineering Dr. TeetutDolwichai2 (Non- destructive testing ) 3 1. 2. 3. 4. 4 2 1. X-ray Ultrasonic2. Liquid penetration Eddy current Magnetic particle5 Introduction to Website X-ray Radiographic X-ray X-ray 7 X-ray X 50 106electron volt (eV, 1 eV = x 10-19J)

2 X X-ray tube8X-raysSamplevoidFilmExposed filmVacuumtubeTube to film distanceAnodeCathodeTungsten filamentTungsten target X-ray9 1. 2. 3. 4. 10 X-ray tubes Tube voltage (kV)Penetration ability (mm)1502504001000up to 25up to 70up to 1005-14011 online Viewing and Interpretation of Radiographs (Elastic waves) 20,000 Hz MHz 20 ultrasonic test13 ultrasonic wave 2 1.

3 (Longitudinal wave) , 2. (Transverse wave) 14 (Longitudinal wave) (Transverse wave)15 MediumLongitude Velocity, (m/s)Wavelengths (mm) for MHzAir (15 C) , modulus of elasticity, density, , Vc 21)21)(1()1( EVC Poisson s ratio17 Refraction 1 2 2 L 12211sinsinVeVe Snell s Law.

4 L= 90 18 HousingDamping-backCrystalSocketMatching elementProtecting face Piezoelectric Quartz Transducer 19 2 - Defect 20s = sound path [mm]c = sound velocity [km/s]t = time of flight (ms)SS =ct/221probeprobeprobe132 Back wall echoNo FlawTransmitterTransmitterTransmitterWor k pieceWork pieceWork piece22probeprobeFlawFlawFlaw DetectionWork pieceWork piece23 Micro-porosityElliptical defectAngled defect24 Angle probe25 Fundamentals of ultrasonic Imaging and Flaw Detection online Liquid Penetrant Inspection 27 1.

5 2. 3-20 3. 4. 1. 2. 3. 14. 28 The penetrant used is often loaded with a fluorescent dye and the inspection is done under UV light to increase test are the advantages and disadvantages of penetrant examination in non- destructive examination ? 31 What are the principles of penetrant examination in non- destructive examination ?

6 Magnetic Particle Inspection Magnetic lines of flux33 SNMagnetic field linesNSMagnetic particlescrack3435 1. 2. 3. 36 Magnetic particle indicationBeforeAfter37 electromagnetic field ( ) electrical conductivity electromagnetic field 5 Eddy current testing38 ConductivematerialCoilCoil's magnetic fieldEddy currentsEddy current's magnetic field39 1.

7 2. 40 Eddy current solenoid coilSpecimenExcitation coilEddy currentMagnetic fieldDifference receive coilCrack41 Pancake-type coilSpecimenEddy currentMagnetic field42 NDT forging, casting Extrusion machining, welding, grinding, heat treating cracking, corrosion, Erosion/wear heat damage 43 Power plants (Heat exchanger)

8 Eddy current 44 visual inspection Electromagnetic 45 46 Due date