NON-DESTRUCTIVE TESTING - PowerPoint PPT Presentation

Loading...

PPT – NON-DESTRUCTIVE TESTING PowerPoint presentation | free to download - id: 40aed8-ZjRkN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

NON-DESTRUCTIVE TESTING

Description:

by GROUP-E MEMBERS 1 JUDE RINALDO 2 JUDE PRADEEP 3 AARYL D SA 4 SWAROOP SUNDER Describe the five types of non-destructive test used in ship construction NON ... – PowerPoint PPT presentation

Number of Views:1592
Avg rating:3.0/5.0
Slides: 22
Provided by: CISD62
Learn more at: http://cmapspublic2.ihmc.us
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: NON-DESTRUCTIVE TESTING


1
NON-DESTRUCTIVE TESTING
  • by
  • GROUP-E
  • MEMBERS
  • 1 JUDE RINALDO
  • 2 JUDE PRADEEP
  • 3 AARYL DSA
  • 4 SWAROOP SUNDER

2
  • Describe the five types of non-destructive test
    used in ship construction

3
NON-DESTRUCTIVE TESTING
  • In this process the material is tested for any
    flaws without applying any kind of stress
  • The test piece is not destroyed or deformed
  • Non-destructive tests are desirable for materials
    that are costly or difficult to fabricate or that
    have been formed into finished or semi finished
    products.
  • At the end of these tests there are no damage to
    the components
  • Non-destructive testing is required to enable the
    soundness of ship welds to be assessed

4
NON-DESTRUCTIVE TESTING
  • There are five of non destructive tests
  • Visual examination
  • Dye penetrant test
  • Magnetic particle inspection
  • Radiographic inspection
  • Ultra sonic inspection

5
VISUAL EXAMINATION
  • Any surface defects are noticed by the
    experienced and responsible personnel
  • Some of the defects are
  • Incorrect bead shape
  • High spatters
  • Under cutting
  • Bad stop and start points
  • Incorrect alignment
  • Surface cracks

6
VISUAL EXAMINATION
  • Visual inspection can be simply visual i.e. with
    the naked eye or at magnifications up to 40
    times.
  • This test can be done in conjunction with NDT or
    as stand alone.
  • When this test is done as stand alone then it is
    used for identifying macro manufacturing defects.

7
VISUAL EXAMINATION
  • When used in conjunction with NDT it is
    essentially applied at every stage involving
    human eye e.g. reading measuring instrument
    screens.
  • This forms the simplest form of investigation
    used as there are no sophisticated and costly
    instruments used.

8
VISUAL EXAMINATION
  • Advantages
  • It is a routine procedure
  • The cost of visual inspection is low
  • It can be very effective where examination is
    made before,during, and after welding

9
DYE PENETRANT TEST
  • Process
  • Liquid ( containing either dye or ultra
    violet-sensitive substances) is sprayed onto
    specimen
  • The liquid is drawn into the crack by capillary
    action, then by highlighting its presence after
    application of a developing agent
  • It will show up a surface flaw
  • To aid the detection of a surface crack, the dye
    is often luminous and is revealed under an ultra
    violet light

10
DYE PENETRANT TEST
  • The dye penetrant test consists of the
    following steps
  • The surface of the metal to be inspected is
    cleaned first and a low viscosity penetrant is
    sprayed on.
  • After a set time the surface is cleaned again.
  • Then a developer is coated on the surface the dye
    seeps out if there is any crack and stains the
    developer red

11
DYE PENETRANT TEST
  • Advantages
  • A simple way to detect surface opening cracks and
    porosities in non porous and clean specimen
  • Low-cost
  • It can detect small defect on smooth and clean
    surfaces
  • Disadvantages
  • Cannot be used for rough and dirty surfaces

12
MAGNETIC PARTICLE INSPECTION
  • Process
  • It is carried out by locally magnetizing the
    specimen by a yoke or a coil
  • Then by spreading a fluid of magnetic particles
    e.g. iron fillings suspended in paraffin on its
    surface
  • Any discontinuity such as a surface crack will
    show up as the particles will concentrate at the
    point where there is an alteration in the
    magnetic field

13
MAGNETIC PARTICLE INSPECTION
  • A component is place between two poles of a
    magnet The lines of magnetism concentrate around
    flaws.
  • Magnetic particles are then applied, in a light
    oil or dry sprayed, onto the surface where they
    indicate the lines of magnetism and any anomalies

14
MAGNETIC PARTICLE INSPECTION
15
MAGNETIC PARTICLE INSPECTION
  • Advantages
  • Portable
  • Fast and rapid
  • Low cost
  • Defects like cracks, slag inclusions and gas
    porosities can be detected
  • Disadvantages
  • Can be used only in Ferro-magnetic material only

16
RADIOGRAPHIC INSPECTION
  • Process
  • A material is subjected to radiation from one
    side, and record the radiation emitted from the
    opposite side
  • Either x ray or gamma ray devices may be used to
    provide the source of radiation
  • Ant obstacle in the path of the radiation will
    affect the radiation density emitted and may be
    recorded
  • As radiation will expose photo graphic plates,
    they are used to record the emitted rays
  • The photographic plates records changes in
    radiation density emitted
  • Thus any defects in welding can be found out by
    this method

17
RADIOGRAPHIC INSPECTION
  • Equipment used

18
RADIOGRAPHIC INSPECTION
  • Advantages
  • It can give a permanent record of the test for
    future evidence
  • It is a quick process
  • Accurate results
  • Disadvantages
  • Cannot use for thick sections
  • Cannot use in places of difficult access
  • The process fails without electricity
  • To interpret the weld radiograph a large amount
    of experience is required
  • gamma rays is an
    alternative to x rays because of this
    disadvantages

19
ULTRASONIC INSPECTION
  • Process
  • The principle of ultrasonic inspection depends on
    the fact that pulses of ultrasonic energy are
    reflected from any surface which they encounter
  • Virtually total reflection occurs at an air-metal
    interface, and therefore to get the ultrasonic
    wave into the metal a liquid (usually grease) is
    placed between the source and metal
  • Pulsed beams of ultrasonic waves pass through the
    object

20
ULTRASONIC INSPECTION
  • Waves traveling through a plate may be
    reflected from the surface of the metal and also
    from the surfaces of any flaws in the metal
  • A receiver detects the reflected waves signal,
    which is displayed after signal amplification and
    analysis by the instrument
  • The pattern of reflection is revealed on either
    Cathode ray tube or liquid crystal display
  • From that we will be able to recognize type
    and location of flaws

21
ULTRASONIC INSPECTION
  • Advantages
  • Low cost
  • Equipments used are easy to handle
  • No health hazards
  • The technique is used for locating fine cracks,
    which are missed by radiography
  • They can also be used for assessing the thickness
    of structural members
About PowerShow.com