various test in NDT are discussed

1. 12/31/2016 Jahangirabad institute of technology 1
*
*INTRODUCTION TO NDT-
CONTINUED…
*By:
Zoha Nasir
Assistant professor
JIT, Barabanki

2. *
It Is Degree Of Satisfaction.
It shows the capability of a material to perform
desired operation
Quality control charts are used in maintaining the
quality of material.
12/31/2016 Jahangirabad institute of technology 2

3. *
It is defined as any departure or discontinuity in
structure from specified requirements.
It reduces the service life of the part.
12/31/2016 Jahangirabad institute of technology 3

4. *
Cracks
Surface defects:1.undercut
2.oxidation
3.Incomplete penetration
Blow holes
Porosity
Slags
Incomplete fusion
12/31/2016 Jahangirabad institute of technology 4

5. *
Visual inspection can be enhanced by looking at the
suspect area with a bright light, a magnifying glass, and
a mirror (when required).
Some defects might be so obvious that further
inspection methods are not required.
The lack of visible defects does not necessarily mean
further inspection is unnecessary.
Some defects may lie beneath the surface or may be so
small that the human eye, even with the assistance of a
magnifying glass, cannot detect them.
12/31/2016 Jahangirabad institute of technology 5

6. *
Inspection by use of a borescope is essentially a visual
inspection.
A borescope is a device that enables the inspector to see inside
areas that could not otherwise be inspected without
disassembly.
An example of an area that can be inspected with a borescope
is the inside of a reciprocating engine cylinder.
The borescope can be inserted into an open spark plug hole to
detect damaged pistons, cylinder walls, or valves.
Another example would be the hot section of a turbine engine
to which access could be gained through the hole of a removed
igniter or removed access plugs specifically installed for
inspection purposes.
12/31/2016 Jahangirabad institute of technology 6

7. Borescopes are available in two basic configurations.
The simpler of the two is a rigid type of small diameter
telescope with a tiny mirror at the end that enables the user to
see around corners.
The other type uses fiber optics that enables greater flexibility.
Many borescopes provide images that can be displayed on a
computer or video monitor for better interpretation of what is
being viewed and to record images for future reference.
Most borescopes also include a light to illuminate the area
being viewed.
12/31/2016 Jahangirabad institute of technology 7

8. *
Acoustic emission is an NDI technique that involves the placing of
acoustic emission sensors at various locations on an aircraft structure and
then applying a load or stress.
The materials emit sound and stress waves that take the form of
ultrasonic pulses. Cracks and areas of corrosion in the stressed airframe
structure emit sound waves which are registered by the sensors.
These acoustic emission bursts can be used to locate flaws and to
evaluate their rate of growth as a function of applied stress.
Acoustic emission testing has an advantage over other NDI methods in
that it can detect and locate all of the activated flaws in a structure in one
test.
Because of the complexity of aircraft structures, application of acoustic
emission testing to aircraft has required a new level of sophistication in
testing technique and data interpretation.
12/31/2016 Jahangirabad institute of technology 8

9. *
VI technique is used to detect:
Corrosion and erosion in metals.
Weld which have discontinuity on the surface.
Cracks.
Fractures.
Leakages.
Misalignment of parts etc.
12/31/2016 Jahangirabad institute of technology 9