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Destructive Examination

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... can reveal a welds Tensile strength, Elastic limit, Yield point, and Ductility. ... Ductility is the ability of a metal to stretch or elongate before it breaks. ... – PowerPoint PPT presentation

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Title: Destructive Examination


1
Destructive Examination Testing
2
Destructive Examination
  • Destructive Examination renders the weld or
    material unfit for further service.

3
Common methods used in Destructive Examination
  • Bend testing
  • Tensile testing
  • Impact testing
  • Hardness testing
  • Chemical analysis
  • Hydrostatic testing to destruction
  • Peel testing
  • Spark testing

4
Bend Testing
  • Bend test samples are referred to as Test
    Coupons
  • The most common bend tests are
  • Guided face and root bend testing
  • Guided side bend testing
  • Longitudinal root and side bend testing
  • Fillet weld bend testing
  • Unguided bend testing

5
Bend Testing Sample Removal
6
Bend Testing Sample Preparation
7
Face Bend Testing
8
Root Bend Testing
9
Side Bend Testing
10
Longitudinal Face Bend Testing
11
Longitudinal Root Bend Testing
12
Fillet Bend Testing
13
Pipe Fillet Bend Testing
14
Tensile Strength Testing
  • Tensile is a test in which a prepared sample is
    pulled until the sample breaks.
  • Test Measurements are recorded in PSI (Pounds
    per Square Inch) E7018 70,000 PSI Tensile
  • Test samples called Tensile Bolts can reveal a
    welds Tensile strength, Elastic limit, Yield
    point, and Ductility.

15
Tensile Strength Testing
  • The Elastic Limit of metal is the stress (load)
    it can withstand and still return to the original
    length after the load is released.
  • Yield Strength occurs when the test sample
    stretches however will not return to its original
    length.
  • Ductility is the ability of a metal to stretch or
    elongate before it breaks.

16
Tensile Testing Strength Graph
17
Impact Testing
  • An Impact tester uses a heavy pendulum that is
    able to measure the amount of force required to
    shear or fracture a test sample taken from welds
    Heat Affected Zone (HAZ)
  • Impact testing may be performed using either the
    Izod or Charpy method. (Both methods are similar)

18
Impact Testing
  • A Charpy or Izod test measures the welds ability
    to withstand an Impact force.
  • Low Charpy test readings indicate brittle weld
    metal
  • Higher Charpy readings indicate the samples
    toughness.

19
Hardness testing
  • Hardness may be defined as the resistance to
    permanent indentation.
  • Three common hardness measuring tests are
  • Rockwell test
  • Scleroscope test
  • Brinell
  • Microhardness test

20
Hardness testing
  • The Rockwell testing machine operates somewhat
    like a press, using a indenter to penetrate the
    surface of the test sample.
  • The depth of the indentation determines the
    materials hardness on a scale of 0-100

21
Hardness testing
  • The Sceleroscpoe testing machine measures the
    amount bounce that a diamond tip hammer
    rebounds off the test sample after being dropped.
  • The Brinell method presses the indenter into a
    sample for a given period of time.
  • The ability for the sample to resist indentation
    determines hardness.

22
Hardness testing
  • Microhardness testers allow you to measure a
    materials hardness while leaving the least amount
    of damage possible on the metals surface.
  • After the indenter is used a powerful microscope
    is used to determine the the amount of
    indentation into the components surface.

23
Chemical Analysis
  • Chemical analysis is used in metallurgical
    laboratories to determine the metals grain and
    crystalline structures.
  • Samples are then place under a high power
    microscope to view the results.
  • This is referred to as Metalography

24
Hydrostatic Testing to Destruction
  • Pressure testing or leak testing can be performed
    with either gasses or liquids.
  • When this pressure exceeds the limitations of the
    structures design it will rupture under force.
  • This rupture will allow engineers to understand
    the welds weakest areas.

25
Peel testing
  • Lap joints may be tested to destruction using a
    Peel test.
  • Peel testing is most commonly used to check the
    strength of resistance spot welds or stud weld
  • Spot weld peel tests are considered successful
    when the spot weld nugget is torn out of the test
    sample pieces in tact.

26
Spark Testing
  • The shape and characteristic of sparks created
    when metal is ground will help determine its
    properties.
  • IE carbon steel , mild steel.

27
Quiz time
  • Which of the following is a destructive test ?
  • A magnet particle
  • B tensile testing
  • C die penetrate testing
  • D ultrasonic testing

28
Quiz time
  • The _______ type hardness test leaves the least
    amount of damage on the metals surface.
  • A Rockwell
  • B Brinell
  • C Scleroscope
  • D Microhardness

29
Quiz time
  • When a metal stretches, but dose not break under
    a certain load, this point is called the
    _________ Point.
  • A yield
  • B tensile
  • C stretch
  • D ultimate strength

30
Quiz time
  • Ductility is the ability of a metal to ________
    before it breaks.
  • A Bend
  • B Stretch or elongate
  • C Be forged
  • D Be indented

31
Quiz time
  • A Charpy test measures a welds ability to
    withstand _________ force.
  • A Impact
  • B Bending
  • C Penetrating
  • D Stretching

32
Quiz time
  • Hardness may be defined as the resistance to
    __________?
  • Indentation

33
Modern Welding York County School of Technology
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