Eddy Current Test	Penetrant Test	Magnetic Particle Test	Visual Test
Radiographic Test	Ultrasonic Test	Magnetic Flux Leakage Test	Visual Test Using Fibrescope

Ultrasonic Test	Principle Application Advantage Limitation
Principle	Back
Ultrasonic inspection detects, locates and evaluate internal discontinuities in metals and other material by directing a high frequency sound beam into a test material on a predictable path which, upon reflecting back from an interruption in material continuity, produces a wave that is amplified and usually displayed as a vertical displacement on a cathode ray tube.

Application	-	Most weld discontinuities including cracks, slag, lack of fusion, lack of bond, accurate thickness measurements possible.	Back
	-	Poisson's ratio may be obtained by determining the modulus of elasticity.
Advantage	-	Most sensitive to planar type defects.	Back
	-	Test results known immediately.
	-	Portable.
	-	Ultrasonic flaw detectors do not require an electrical power outlet.
	-	High outlet.
	-	High penetration capability.
	-	Requires access from only one surface.
Limitations	-	Surface condition should be suitable for coupling of transducer.	Back
	-	Couplant (liquid) required.
	-	Small, thin welds may be difficult to inspect.
	-	Reference standards are required.
	-	Requires a relatively skilled operator/inspector, and skilled interpretive personnel.
	-	Resolution of small defects near surface difficult.